UBUNTU-CVE-2026-56855

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Source
https://ubuntu.com/security/CVE-2026-56855
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-56855
Upstream
Published
2026-09-02T20:17:00Z
Modified
2026-09-16T11:36:40Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.

References

Affected packages

Ubuntu:16.04:LTS
golang-defaults

Package

Name
golang-defaults
Purl
pkg:deb/ubuntu/golang-defaults?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:1.*
2:1.6-1ubuntu3
2:1.6-1ubuntu4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang",
            "binary_version": "2:1.6-1ubuntu4"
        },
        {
            "binary_name": "golang-any",
            "binary_version": "2:1.6-1ubuntu4"
        },
        {
            "binary_name": "golang-go",
            "binary_version": "2:1.6-1ubuntu4"
        },
        {
            "binary_name": "golang-race-detector-runtime",
            "binary_version": "2:1.6-1ubuntu4"
        },
        {
            "binary_name": "golang-src",
            "binary_version": "2:1.6-1ubuntu4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
Ubuntu:18.04:LTS
golang-defaults

Package

Name
golang-defaults
Purl
pkg:deb/ubuntu/golang-defaults?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:1.*
2:1.8~1ubuntu1
2:1.9~2ubuntu1
2:1.10~4ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gccgo-go",
            "binary_version": "2:1.10~4ubuntu1"
        },
        {
            "binary_name": "golang",
            "binary_version": "2:1.10~4ubuntu1"
        },
        {
            "binary_name": "golang-any",
            "binary_version": "2:1.10~4ubuntu1"
        },
        {
            "binary_name": "golang-go",
            "binary_version": "2:1.10~4ubuntu1"
        },
        {
            "binary_name": "golang-race-detector-runtime",
            "binary_version": "2:1.10~4ubuntu1"
        },
        {
            "binary_name": "golang-src",
            "binary_version": "2:1.10~4ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
Ubuntu:20.04:LTS
golang-defaults

Package

Name
golang-defaults
Purl
pkg:deb/ubuntu/golang-defaults?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:1.*
2:1.12~1ubuntu1
2:1.13~1ubuntu1
2:1.13~1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gccgo-go",
            "binary_version": "2:1.13~1ubuntu2"
        },
        {
            "binary_name": "golang",
            "binary_version": "2:1.13~1ubuntu2"
        },
        {
            "binary_name": "golang-any",
            "binary_version": "2:1.13~1ubuntu2"
        },
        {
            "binary_name": "golang-go",
            "binary_version": "2:1.13~1ubuntu2"
        },
        {
            "binary_name": "golang-race-detector-runtime",
            "binary_version": "2:1.13~1ubuntu2"
        },
        {
            "binary_name": "golang-src",
            "binary_version": "2:1.13~1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.20

Package

Name
golang-1.20
Purl
pkg:deb/ubuntu/golang-1.20?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.20.3-1ubuntu0.1~20.04
1.20.3-1ubuntu0.1~20.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.20",
            "binary_version": "1.20.3-1ubuntu0.1~20.04.1"
        },
        {
            "binary_name": "golang-1.20-go",
            "binary_version": "1.20.3-1ubuntu0.1~20.04.1"
        },
        {
            "binary_name": "golang-1.20-src",
            "binary_version": "1.20.3-1ubuntu0.1~20.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.21

Package

Name
golang-1.21
Purl
pkg:deb/ubuntu/golang-1.21?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.21.1-1~ubuntu20.04.1
1.21.1-1~ubuntu20.04.2
1.21.1-1~ubuntu20.04.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.21",
            "binary_version": "1.21.1-1~ubuntu20.04.3"
        },
        {
            "binary_name": "golang-1.21-go",
            "binary_version": "1.21.1-1~ubuntu20.04.3"
        },
        {
            "binary_name": "golang-1.21-src",
            "binary_version": "1.21.1-1~ubuntu20.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.22

Package

Name
golang-1.22
Purl
pkg:deb/ubuntu/golang-1.22?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.22.2-2~20.04.1
1.22.2-2~20.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.22",
            "binary_version": "1.22.2-2~20.04.2"
        },
        {
            "binary_name": "golang-1.22-go",
            "binary_version": "1.22.2-2~20.04.2"
        },
        {
            "binary_name": "golang-1.22-src",
            "binary_version": "1.22.2-2~20.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
Ubuntu:22.04:LTS
golang-1.17

Package

Name
golang-1.17
Purl
pkg:deb/ubuntu/golang-1.17?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.17-1ubuntu2
1.17.3-1ubuntu1
1.17.3-1ubuntu2
1.17.13-3ubuntu1
1.17.13-3ubuntu1.2
1.17.13-3ubuntu1.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.17",
            "binary_version": "1.17.13-3ubuntu1.3"
        },
        {
            "binary_name": "golang-1.17-go",
            "binary_version": "1.17.13-3ubuntu1.3"
        },
        {
            "binary_name": "golang-1.17-src",
            "binary_version": "1.17.13-3ubuntu1.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.20

Package

Name
golang-1.20
Purl
pkg:deb/ubuntu/golang-1.20?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.20.3-1ubuntu0.1~22.04
1.20.3-1ubuntu0.1~22.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.20",
            "binary_version": "1.20.3-1ubuntu0.1~22.04.1"
        },
        {
            "binary_name": "golang-1.20-go",
            "binary_version": "1.20.3-1ubuntu0.1~22.04.1"
        },
        {
            "binary_name": "golang-1.20-src",
            "binary_version": "1.20.3-1ubuntu0.1~22.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.21

Package

Name
golang-1.21
Purl
pkg:deb/ubuntu/golang-1.21?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.21.1-1~ubuntu22.04.1
1.21.1-1~ubuntu22.04.2
1.21.1-1~ubuntu22.04.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.21",
            "binary_version": "1.21.1-1~ubuntu22.04.3"
        },
        {
            "binary_name": "golang-1.21-go",
            "binary_version": "1.21.1-1~ubuntu22.04.3"
        },
        {
            "binary_name": "golang-1.21-src",
            "binary_version": "1.21.1-1~ubuntu22.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.22

Package

Name
golang-1.22
Purl
pkg:deb/ubuntu/golang-1.22?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.22.2-2~22.04
1.22.2-2~22.04.1
1.22.2-2~22.04.2
1.22.2-2~22.04.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.22",
            "binary_version": "1.22.2-2~22.04.3"
        },
        {
            "binary_name": "golang-1.22-go",
            "binary_version": "1.22.2-2~22.04.3"
        },
        {
            "binary_name": "golang-1.22-src",
            "binary_version": "1.22.2-2~22.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.23

Package

Name
golang-1.23
Purl
pkg:deb/ubuntu/golang-1.23?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.23.1-1~22.04
1.23.1-1~22.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.23",
            "binary_version": "1.23.1-1~22.04.2"
        },
        {
            "binary_name": "golang-1.23-go",
            "binary_version": "1.23.1-1~22.04.2"
        },
        {
            "binary_name": "golang-1.23-src",
            "binary_version": "1.23.1-1~22.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.24

Package

Name
golang-1.24
Purl
pkg:deb/ubuntu/golang-1.24?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.24.4-1ubuntu1~22.04.1
1.24.4-1ubuntu1~22.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.24",
            "binary_version": "1.24.4-1ubuntu1~22.04.2"
        },
        {
            "binary_name": "golang-1.24-go",
            "binary_version": "1.24.4-1ubuntu1~22.04.2"
        },
        {
            "binary_name": "golang-1.24-src",
            "binary_version": "1.24.4-1ubuntu1~22.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-defaults

Package

Name
golang-defaults
Purl
pkg:deb/ubuntu/golang-defaults?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:1.*
2:1.17~0ubuntu1
2:1.17~1
2:1.18~0ubuntu1
2:1.18~0ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gccgo-go",
            "binary_version": "2:1.18~0ubuntu2"
        },
        {
            "binary_name": "golang",
            "binary_version": "2:1.18~0ubuntu2"
        },
        {
            "binary_name": "golang-any",
            "binary_version": "2:1.18~0ubuntu2"
        },
        {
            "binary_name": "golang-go",
            "binary_version": "2:1.18~0ubuntu2"
        },
        {
            "binary_name": "golang-src",
            "binary_version": "2:1.18~0ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
Ubuntu:24.04:LTS
golang-1.21

Package

Name
golang-1.21
Purl
pkg:deb/ubuntu/golang-1.21?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.21.1-1
1.21.3-1
1.21.4-1
1.21.5-1
1.21.6-1
1.21.7-1
1.21.7-2
1.21.8-1
1.21.8-1build1
1.21.9-1
1.21.9-1ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.21",
            "binary_version": "1.21.9-1ubuntu0.1"
        },
        {
            "binary_name": "golang-1.21-go",
            "binary_version": "1.21.9-1ubuntu0.1"
        },
        {
            "binary_name": "golang-1.21-src",
            "binary_version": "1.21.9-1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.22

Package

Name
golang-1.22
Purl
pkg:deb/ubuntu/golang-1.22?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.22~rc1-2
1.22.0-1
1.22.0-2
1.22.1-1
1.22.1-1build1
1.22.2-2
1.22.2-2ubuntu0.1
1.22.2-2ubuntu0.2
1.22.2-2ubuntu0.3
1.22.2-2ubuntu0.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.22",
            "binary_version": "1.22.2-2ubuntu0.4"
        },
        {
            "binary_name": "golang-1.22-go",
            "binary_version": "1.22.2-2ubuntu0.4"
        },
        {
            "binary_name": "golang-1.22-src",
            "binary_version": "1.22.2-2ubuntu0.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.23

Package

Name
golang-1.23
Purl
pkg:deb/ubuntu/golang-1.23?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.23.1-1~24.04
1.23.1-1~24.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.23",
            "binary_version": "1.23.1-1~24.04.1"
        },
        {
            "binary_name": "golang-1.23-go",
            "binary_version": "1.23.1-1~24.04.1"
        },
        {
            "binary_name": "golang-1.23-src",
            "binary_version": "1.23.1-1~24.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.24

Package

Name
golang-1.24
Purl
pkg:deb/ubuntu/golang-1.24?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.24.4-1ubuntu1~24.04.1
1.24.4-1ubuntu1~24.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.24",
            "binary_version": "1.24.4-1ubuntu1~24.04.2"
        },
        {
            "binary_name": "golang-1.24-go",
            "binary_version": "1.24.4-1ubuntu1~24.04.2"
        },
        {
            "binary_name": "golang-1.24-src",
            "binary_version": "1.24.4-1ubuntu1~24.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-defaults

Package

Name
golang-defaults
Purl
pkg:deb/ubuntu/golang-defaults?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:1.*
2:1.21~2
2:1.21~3
2:1.22~2
2:1.22~2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gccgo-go",
            "binary_version": "2:1.22~2build1"
        },
        {
            "binary_name": "golang",
            "binary_version": "2:1.22~2build1"
        },
        {
            "binary_name": "golang-any",
            "binary_version": "2:1.22~2build1"
        },
        {
            "binary_name": "golang-go",
            "binary_version": "2:1.22~2build1"
        },
        {
            "binary_name": "golang-src",
            "binary_version": "2:1.22~2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
Ubuntu:26.04:LTS
golang-1.23

Package

Name
golang-1.23
Purl
pkg:deb/ubuntu/golang-1.23?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.23.10-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.23",
            "binary_version": "1.23.10-1"
        },
        {
            "binary_name": "golang-1.23-go",
            "binary_version": "1.23.10-1"
        },
        {
            "binary_name": "golang-1.23-src",
            "binary_version": "1.23.10-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.24

Package

Name
golang-1.24
Purl
pkg:deb/ubuntu/golang-1.24?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.24.4-1ubuntu1
1.24.9-1
1.24.13-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.24",
            "binary_version": "1.24.13-2"
        },
        {
            "binary_name": "golang-1.24-go",
            "binary_version": "1.24.13-2"
        },
        {
            "binary_name": "golang-1.24-src",
            "binary_version": "1.24.13-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.25

Package

Name
golang-1.25
Purl
pkg:deb/ubuntu/golang-1.25?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.25.0-0ubuntu1
1.25.7-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.25",
            "binary_version": "1.25.7-2"
        },
        {
            "binary_name": "golang-1.25-go",
            "binary_version": "1.25.7-2"
        },
        {
            "binary_name": "golang-1.25-src",
            "binary_version": "1.25.7-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-1.26

Package

Name
golang-1.26
Purl
pkg:deb/ubuntu/golang-1.26?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.26~rc3-2
1.26.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-1.26",
            "binary_version": "1.26.0-1"
        },
        {
            "binary_name": "golang-1.26-go",
            "binary_version": "1.26.0-1"
        },
        {
            "binary_name": "golang-1.26-src",
            "binary_version": "1.26.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"
golang-defaults

Package

Name
golang-defaults
Purl
pkg:deb/ubuntu/golang-defaults?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:1.*
2:1.24~2
2:1.25~1
2:1.26~1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "gccgo-go",
            "binary_version": "2:1.26~1"
        },
        {
            "binary_name": "golang",
            "binary_version": "2:1.26~1"
        },
        {
            "binary_name": "golang-any",
            "binary_version": "2:1.26~1"
        },
        {
            "binary_name": "golang-go",
            "binary_version": "2:1.26~1"
        },
        {
            "binary_name": "golang-src",
            "binary_version": "2:1.26~1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56855.json"