UBUNTU-CVE-2026-3731

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Source
https://ubuntu.com/security/CVE-2026-3731
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-3731
Upstream
Downstream
Related
Published
2026-03-08T11:15:00Z
Modified
2026-04-27T18:57:18.585838Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 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
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftpextensionsgetname/sftpextensionsgetdata of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.

References

Affected packages

Ubuntu:22.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.9.6-2ubuntu0.22.04.7?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.6-2ubuntu0.22.04.7

Affected versions

0.*
0.9.6-1
0.9.6-1build1
0.9.6-2
0.9.6-2build1
0.9.6-2ubuntu0.22.04.1
0.9.6-2ubuntu0.22.04.2
0.9.6-2ubuntu0.22.04.3
0.9.6-2ubuntu0.22.04.4
0.9.6-2ubuntu0.22.04.5
0.9.6-2ubuntu0.22.04.6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.9.6-2ubuntu0.22.04.7"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.9.6-2ubuntu0.22.04.7"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
Ubuntu:24.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.10.6-2ubuntu0.4?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.10.6-2ubuntu0.4

Affected versions

0.*
0.10.5-3ubuntu1
0.10.5-3ubuntu2
0.10.6-2
0.10.6-2build1
0.10.6-2build2
0.10.6-2ubuntu0.1
0.10.6-2ubuntu0.2
0.10.6-2ubuntu0.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.10.6-2ubuntu0.4"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.10.6-2ubuntu0.4"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
Ubuntu:25.10
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.11.2-1ubuntu0.3?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.11.2-1ubuntu0.3

Affected versions

0.*
0.11.1-1
0.11.1-2
0.11.2-1
0.11.2-1build1
0.11.2-1ubuntu0.1
0.11.2-1ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.11.2-1ubuntu0.3"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
Ubuntu:26.04
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.11.3-1ubuntu1?arch=source&distro=resolute

Affected ranges

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

Affected versions

0.*
0.11.2-1build1
0.11.3-1
0.11.3-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.11.3-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
Ubuntu:Pro:16.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.6.3-4.3ubuntu0.6+esm5?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.6.3-4.3ubuntu0.6+esm5

Affected versions

0.*
0.6.3-3ubuntu3
0.6.3-4.1
0.6.3-4.2
0.6.3-4.2ubuntu1
0.6.3-4.3
0.6.3-4.3ubuntu0.1
0.6.3-4.3ubuntu0.2
0.6.3-4.3ubuntu0.5
0.6.3-4.3ubuntu0.6
0.6.3-4.3ubuntu0.6+esm1
0.6.3-4.3ubuntu0.6+esm2
0.6.3-4.3ubuntu0.6+esm3
0.6.3-4.3ubuntu0.6+esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.6.3-4.3ubuntu0.6+esm5"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.6.3-4.3ubuntu0.6+esm5"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
Ubuntu:Pro:18.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7?arch=source&distro=esm-infra/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7

Affected versions

0.*
0.7.5-1
0.8.0~20170825.94fa1e38-1
0.8.0~20170825.94fa1e38-1build1
0.8.0~20170825.94fa1e38-1ubuntu0.1
0.8.0~20170825.94fa1e38-1ubuntu0.2
0.8.0~20170825.94fa1e38-1ubuntu0.5
0.8.0~20170825.94fa1e38-1ubuntu0.6
0.8.0~20170825.94fa1e38-1ubuntu0.7
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm5
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
Ubuntu:Pro:20.04:LTS
libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.9.3-2ubuntu2.5+esm4?arch=source&distro=esm-infra/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.3-2ubuntu2.5+esm4

Affected versions

0.*
0.9.0-1ubuntu1
0.9.0-1ubuntu4
0.9.0-1ubuntu5
0.9.3-2ubuntu1
0.9.3-2ubuntu2
0.9.3-2ubuntu2.1
0.9.3-2ubuntu2.2
0.9.3-2ubuntu2.3
0.9.3-2ubuntu2.4
0.9.3-2ubuntu2.5
0.9.3-2ubuntu2.5+esm1
0.9.3-2ubuntu2.5+esm2
0.9.3-2ubuntu2.5+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.9.3-2ubuntu2.5+esm4"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.9.3-2ubuntu2.5+esm4"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"