UBUNTU-CVE-2026-27820

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Source
https://ubuntu.com/security/CVE-2026-27820
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-27820
Upstream
  • CVE-2026-27820
Published
2026-04-16T18:16:00Z
Modified
2026-06-15T20:15:11.903435928Z
Severity
  • 1.7 (Low) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U CVSS Calculator
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

zlib is a Ruby interface for the zlib compression/decompression library. Versions 3.0.0 and below, 3.1.0, 3.1.1, 3.2.0 and 3.2.1 contain a buffer overflow vulnerability in the Zlib::GzipReader. The zstreambufferungets function prepends caller-provided bytes ahead of previously produced output but fails to guarantee the backing Ruby string has enough capacity before the memmove shifts the existing data. This can lead to memory corruption when the buffer length exceeds capacity. This issue has been fixed in versions 3.0.1, 3.1.2 and 3.2.3.

References

Affected packages

Ubuntu:16.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=xenial

Affected ranges

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

Affected versions

1.*
1.7.21-2ubuntu4
1.7.22-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.7.22-1ubuntu1",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:18.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=bionic

Affected ranges

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

Affected versions

9.*
9.1.13.0-1
9.1.17.0-1~18.04

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "9.1.17.0-1~18.04",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:20.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=focal

Affected ranges

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

Affected versions

9.*
9.1.17.0-3
9.1.17.0-3build5
9.1.17.0-3build6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "9.1.17.0-3build6",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:22.04:LTS
ruby3.0

Package

Name
ruby3.0
Purl
pkg:deb/ubuntu/ruby3.0?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.0.2-5ubuntu1
3.0.2-7
3.0.2-7ubuntu2
3.0.2-7ubuntu2.1
3.0.2-7ubuntu2.2
3.0.2-7ubuntu2.3
3.0.2-7ubuntu2.4
3.0.2-7ubuntu2.5
3.0.2-7ubuntu2.6
3.0.2-7ubuntu2.7
3.0.2-7ubuntu2.8
3.0.2-7ubuntu2.10
3.0.2-7ubuntu2.11
3.0.2-7ubuntu2.12

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.0.2-7ubuntu2.12",
            "binary_name": "libruby3.0"
        },
        {
            "binary_version": "3.0.2-7ubuntu2.12",
            "binary_name": "ruby3.0"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:24.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=noble

Affected ranges

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

Affected versions

9.*
9.3.9.0+ds-1
9.4.5.0+ds-1
9.4.5.0+ds-1ubuntu1
9.4.6.0+ds-1ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "9.4.6.0+ds-1ubuntu3",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
ruby3.2

Package

Name
ruby3.2
Purl
pkg:deb/ubuntu/ruby3.2?arch=source&distro=noble

Affected ranges

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

Affected versions

3.*
3.2.3-1
3.2.3-1build2
3.2.3-1build3
3.2.3-1ubuntu0.24.04.1
3.2.3-1ubuntu0.24.04.3
3.2.3-1ubuntu0.24.04.5
3.2.3-1ubuntu0.24.04.6
3.2.3-1ubuntu0.24.04.7

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.2.3-1ubuntu0.24.04.7",
            "binary_name": "libruby3.2"
        },
        {
            "binary_version": "3.2.3-1ubuntu0.24.04.7",
            "binary_name": "ruby3.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:25.10
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=questing

Affected ranges

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

Affected versions

9.*
9.4.8.0+ds-2ubuntu1
9.4.8.0+ds-3ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "9.4.8.0+ds-3ubuntu1",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
ruby3.3

Package

Name
ruby3.3
Purl
pkg:deb/ubuntu/ruby3.3?arch=source&distro=questing

Affected ranges

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

Affected versions

3.*
3.3.7-1ubuntu2
3.3.8-2ubuntu1
3.3.8-2ubuntu2
3.3.8-2ubuntu2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.3.8-2ubuntu2.1",
            "binary_name": "libruby3.3"
        },
        {
            "binary_version": "3.3.8-2ubuntu2.1",
            "binary_name": "ruby3.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:26.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=resolute

Affected ranges

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

Affected versions

9.*
9.4.8.0+ds-3ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "9.4.8.0+ds-3ubuntu1",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
ruby3.3

Package

Name
ruby3.3
Purl
pkg:deb/ubuntu/ruby3.3?arch=source&distro=resolute

Affected ranges

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

Affected versions

3.*
3.3.8-2ubuntu2
3.3.8-2ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.3.8-2ubuntu3",
            "binary_name": "libruby3.3"
        },
        {
            "binary_version": "3.3.8-2ubuntu3",
            "binary_name": "ruby3.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:Pro:14.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

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

Affected versions

1.*
1.5.6-5ubuntu1
1.5.6-6
1.5.6-7
1.5.6-9+deb8u2build0.14.04.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.5.6-9+deb8u2build0.14.04.1~esm2",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:Pro:16.04:LTS
ruby2.3

Package

Name
ruby2.3
Purl
pkg:deb/ubuntu/ruby2.3?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

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

Affected versions

2.*
2.3.0-1
2.3.0-2
2.3.0-4ubuntu2
2.3.0-4ubuntu3
2.3.0-5ubuntu1
2.3.1-2~16.04
2.3.1-2~16.04.2
2.3.1-2~16.04.4
2.3.1-2~16.04.5
2.3.1-2~16.04.6
2.3.1-2~16.04.7
2.3.1-2~16.04.9
2.3.1-2~16.04.10
2.3.1-2~16.04.11
2.3.1-2~16.04.12
2.3.1-2~ubuntu16.04.13
2.3.1-2~ubuntu16.04.14
2.3.1-2~ubuntu16.04.15
2.3.1-2~ubuntu16.04.16
2.3.1-2~ubuntu16.04.16+esm1
2.3.1-2~ubuntu16.04.16+esm2
2.3.1-2~ubuntu16.04.16+esm3
2.3.1-2~ubuntu16.04.16+esm4
2.3.1-2~ubuntu16.04.16+esm5
2.3.1-2~ubuntu16.04.16+esm6
2.3.1-2~ubuntu16.04.16+esm7
2.3.1-2~ubuntu16.04.16+esm8
2.3.1-2~ubuntu16.04.16+esm9
2.3.1-2~ubuntu16.04.16+esm10
2.3.1-2~ubuntu16.04.16+esm11
2.3.1-2~ubuntu16.04.16+esm12
2.3.1-2~ubuntu16.04.16+esm14

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.3.1-2~ubuntu16.04.16+esm14",
            "binary_name": "libruby2.3"
        },
        {
            "binary_version": "2.3.1-2~ubuntu16.04.16+esm14",
            "binary_name": "ruby2.3"
        },
        {
            "binary_version": "2.3.1-2~ubuntu16.04.16+esm14",
            "binary_name": "ruby2.3-tcltk"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:Pro:18.04:LTS
ruby2.5

Package

Name
ruby2.5
Purl
pkg:deb/ubuntu/ruby2.5?arch=source&distro=esm-infra%2Fbionic

Affected ranges

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

Affected versions

2.*
2.5.0~preview1-1ubuntu2
2.5.0-4ubuntu1
2.5.0-4ubuntu4
2.5.0-5ubuntu1
2.5.0-6ubuntu1
2.5.1-1ubuntu1
2.5.1-1ubuntu1.1
2.5.1-1ubuntu1.2
2.5.1-1ubuntu1.4
2.5.1-1ubuntu1.5
2.5.1-1ubuntu1.6
2.5.1-1ubuntu1.7
2.5.1-1ubuntu1.8
2.5.1-1ubuntu1.9
2.5.1-1ubuntu1.10
2.5.1-1ubuntu1.11
2.5.1-1ubuntu1.12
2.5.1-1ubuntu1.13
2.5.1-1ubuntu1.14
2.5.1-1ubuntu1.15
2.5.1-1ubuntu1.16
2.5.1-1ubuntu1.16+esm1
2.5.1-1ubuntu1.16+esm3
2.5.1-1ubuntu1.16+esm4
2.5.1-1ubuntu1.16+esm5
2.5.1-1ubuntu1.16+esm6
2.5.1-1ubuntu1.16+esm7
2.5.1-1ubuntu1.16+esm8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.5.1-1ubuntu1.16+esm8",
            "binary_name": "libruby2.5"
        },
        {
            "binary_version": "2.5.1-1ubuntu1.16+esm8",
            "binary_name": "ruby2.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"
Ubuntu:Pro:20.04:LTS
ruby2.7

Package

Name
ruby2.7
Purl
pkg:deb/ubuntu/ruby2.7?arch=source&distro=esm-infra%2Ffocal

Affected ranges

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

Affected versions

2.*
2.7.0-1
2.7.0-2
2.7.0-3
2.7.0-4
2.7.0-4ubuntu1
2.7.0-5ubuntu1
2.7.0-5ubuntu1.1
2.7.0-5ubuntu1.2
2.7.0-5ubuntu1.3
2.7.0-5ubuntu1.4
2.7.0-5ubuntu1.5
2.7.0-5ubuntu1.6
2.7.0-5ubuntu1.7
2.7.0-5ubuntu1.8
2.7.0-5ubuntu1.9
2.7.0-5ubuntu1.10
2.7.0-5ubuntu1.11
2.7.0-5ubuntu1.12
2.7.0-5ubuntu1.13
2.7.0-5ubuntu1.14
2.7.0-5ubuntu1.15
2.7.0-5ubuntu1.16
2.7.0-5ubuntu1.17
2.7.0-5ubuntu1.18
2.7.0-5ubuntu1.18+esm1
2.7.0-5ubuntu1.18+esm3
2.7.0-5ubuntu1.18+esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.7.0-5ubuntu1.18+esm4",
            "binary_name": "libruby2.7"
        },
        {
            "binary_version": "2.7.0-5ubuntu1.18+esm4",
            "binary_name": "ruby2.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27820.json"