UBUNTU-CVE-2026-11979

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Source
https://ubuntu.com/security/CVE-2026-11979
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11979.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-11979
Upstream
Published
2026-06-29T14:16:00Z
Modified
2026-07-07T21:03:18.551932826Z
Severity
  • 1.8 (Low) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:L/SI:L/SA:N CVSS Calculator
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - negligible
Summary
[none]
Details

libxml2 is vulnerable to multiple stack-based buffer overflows in the xmlcatalog utility when running in --shell mode. The usershell() function processes user input using fixed-size stack buffers without proper bounds checking. By supplying an overly long input line, an attacker can overflow internal buffers (command, arg, and argv) during input parsing. This results in memory corruption within the stack frame. Successful exploitation may cause a crash or potentially allow arbitrary code execution in the context of the xmlcatalog process. This issue has been fixed in the commit c2e233fc. NOTE: The maintainers of this project did not agree that this issue is a vulnerability and considered it a bug.

References

Affected packages

Ubuntu:22.04:LTS
libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.9.12+dfsg-4
2.9.12+dfsg-5
2.9.12+dfsg-6
2.9.13+dfsg-1
2.9.13+dfsg-1build1
2.9.13+dfsg-1ubuntu0.1
2.9.13+dfsg-1ubuntu0.2
2.9.13+dfsg-1ubuntu0.3
2.9.13+dfsg-1ubuntu0.4
2.9.13+dfsg-1ubuntu0.5
2.9.13+dfsg-1ubuntu0.6
2.9.13+dfsg-1ubuntu0.7
2.9.13+dfsg-1ubuntu0.8
2.9.13+dfsg-1ubuntu0.9
2.9.13+dfsg-1ubuntu0.10
2.9.13+dfsg-1ubuntu0.11
2.9.13+dfsg-1ubuntu0.12

Ecosystem specific 

{
    "priority_reason": "This is only a crash in a command line tool with no security impact.",
    "binaries": [
        {
            "binary_name": "libxml2",
            "binary_version": "2.9.13+dfsg-1ubuntu0.12"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.13+dfsg-1ubuntu0.12"
        },
        {
            "binary_name": "python3-libxml2",
            "binary_version": "2.9.13+dfsg-1ubuntu0.12"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11979.json"
Ubuntu:24.04:LTS
libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.9.14+dfsg-1.3
2.9.14+dfsg-1.3build1
2.9.14+dfsg-1.3build2
2.9.14+dfsg-1.3build3
2.9.14+dfsg-1.3ubuntu1
2.9.14+dfsg-1.3ubuntu2
2.9.14+dfsg-1.3ubuntu3
2.9.14+dfsg-1.3ubuntu3.1
2.9.14+dfsg-1.3ubuntu3.2
2.9.14+dfsg-1.3ubuntu3.3
2.9.14+dfsg-1.3ubuntu3.4
2.9.14+dfsg-1.3ubuntu3.5
2.9.14+dfsg-1.3ubuntu3.6
2.9.14+dfsg-1.3ubuntu3.7
2.9.14+dfsg-1.3ubuntu3.8

Ecosystem specific 

{
    "priority_reason": "This is only a crash in a command line tool with no security impact.",
    "binaries": [
        {
            "binary_name": "libxml2",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.8"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.8"
        },
        {
            "binary_name": "python3-libxml2",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11979.json"
Ubuntu:25.10
libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*
2.12.7+dfsg+really2.9.14-0.4
2.12.7+dfsg+really2.9.14-0.4ubuntu0.1
2.12.7+dfsg+really2.9.14-1
2.14.3+dfsg-0exp1
2.14.3+dfsg-0exp2
2.14.3+dfsg-0exp3
2.14.4+dfsg-0exp1
2.14.5+dfsg-0exp1
2.14.5+dfsg-0exp2
2.14.5+dfsg-0.1
2.14.5+dfsg-0.2
2.14.5+dfsg-0.2ubuntu0.1
2.14.5+dfsg-0.2ubuntu0.2

Ecosystem specific 

{
    "priority_reason": "This is only a crash in a command line tool with no security impact.",
    "binaries": [
        {
            "binary_name": "libxml2-16",
            "binary_version": "2.14.5+dfsg-0.2ubuntu0.2"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.14.5+dfsg-0.2ubuntu0.2"
        },
        {
            "binary_name": "python3-libxml2",
            "binary_version": "2.14.5+dfsg-0.2ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11979.json"
Ubuntu:26.04:LTS
libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.14.5+dfsg-0.2
2.14.5+dfsg-0.2build1
2.15.1+dfsg-0.3
2.15.1+dfsg-0.4
2.15.1+dfsg-1
2.15.1+dfsg-2
2.15.1+dfsg-2ubuntu1
2.15.1+dfsg-2ubuntu2
2.15.2+dfsg-0.1
2.15.2+dfsg-0.1ubuntu0.1

Ecosystem specific 

{
    "priority_reason": "This is only a crash in a command line tool with no security impact.",
    "binaries": [
        {
            "binary_name": "libxml2-16",
            "binary_version": "2.15.2+dfsg-0.1ubuntu0.1"
        },
        {
            "binary_name": "libxml2-source",
            "binary_version": "2.15.2+dfsg-0.1ubuntu0.1"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.15.2+dfsg-0.1ubuntu0.1"
        },
        {
            "binary_name": "python3-libxml2",
            "binary_version": "2.15.2+dfsg-0.1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11979.json"
Ubuntu:Pro:14.04:LTS
libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

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

Affected versions

2.*
2.9.1+dfsg1-3ubuntu2
2.9.1+dfsg1-3ubuntu3
2.9.1+dfsg1-3ubuntu4
2.9.1+dfsg1-3ubuntu4.1
2.9.1+dfsg1-3ubuntu4.2
2.9.1+dfsg1-3ubuntu4.3
2.9.1+dfsg1-3ubuntu4.4
2.9.1+dfsg1-3ubuntu4.5
2.9.1+dfsg1-3ubuntu4.6
2.9.1+dfsg1-3ubuntu4.7
2.9.1+dfsg1-3ubuntu4.8
2.9.1+dfsg1-3ubuntu4.9
2.9.1+dfsg1-3ubuntu4.10
2.9.1+dfsg1-3ubuntu4.11
2.9.1+dfsg1-3ubuntu4.12
2.9.1+dfsg1-3ubuntu4.13
2.9.1+dfsg1-3ubuntu4.13+esm1
2.9.1+dfsg1-3ubuntu4.13+esm2
2.9.1+dfsg1-3ubuntu4.13+esm3
2.9.1+dfsg1-3ubuntu4.13+esm4
2.9.1+dfsg1-3ubuntu4.13+esm5
2.9.1+dfsg1-3ubuntu4.13+esm6
2.9.1+dfsg1-3ubuntu4.13+esm7
2.9.1+dfsg1-3ubuntu4.13+esm8
2.9.1+dfsg1-3ubuntu4.13+esm9
2.9.1+dfsg1-3ubuntu4.13+esm10
2.9.1+dfsg1-3ubuntu4.13+esm11

Ecosystem specific 

{
    "priority_reason": "This is only a crash in a command line tool with no security impact.",
    "binaries": [
        {
            "binary_name": "libxml2",
            "binary_version": "2.9.1+dfsg1-3ubuntu4.13+esm11"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.1+dfsg1-3ubuntu4.13+esm11"
        },
        {
            "binary_name": "python-libxml2",
            "binary_version": "2.9.1+dfsg1-3ubuntu4.13+esm11"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11979.json"
Ubuntu:Pro:16.04:LTS
libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=esm-infra%2Fxenial

Affected ranges

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

Affected versions

2.*
2.9.2+zdfsg1-4
2.9.2+zdfsg1-4ubuntu1
2.9.2+zdfsg1-4ubuntu2
2.9.2+zdfsg1-4ubuntu3
2.9.3+dfsg1-1
2.9.3+dfsg1-1ubuntu0.1
2.9.3+dfsg1-1ubuntu0.2
2.9.3+dfsg1-1ubuntu0.3
2.9.3+dfsg1-1ubuntu0.4
2.9.3+dfsg1-1ubuntu0.5
2.9.3+dfsg1-1ubuntu0.6
2.9.3+dfsg1-1ubuntu0.7
2.9.3+dfsg1-1ubuntu0.7+esm1
2.9.3+dfsg1-1ubuntu0.7+esm2
2.9.3+dfsg1-1ubuntu0.7+esm3
2.9.3+dfsg1-1ubuntu0.7+esm4
2.9.3+dfsg1-1ubuntu0.7+esm5
2.9.3+dfsg1-1ubuntu0.7+esm6
2.9.3+dfsg1-1ubuntu0.7+esm7
2.9.3+dfsg1-1ubuntu0.7+esm8
2.9.3+dfsg1-1ubuntu0.7+esm9
2.9.3+dfsg1-1ubuntu0.7+esm10
2.9.3+dfsg1-1ubuntu0.7+esm11
2.9.3+dfsg1-1ubuntu0.7+esm12

Ecosystem specific 

{
    "priority_reason": "This is only a crash in a command line tool with no security impact.",
    "binaries": [
        {
            "binary_name": "libxml2",
            "binary_version": "2.9.3+dfsg1-1ubuntu0.7+esm12"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.3+dfsg1-1ubuntu0.7+esm12"
        },
        {
            "binary_name": "python-libxml2",
            "binary_version": "2.9.3+dfsg1-1ubuntu0.7+esm12"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11979.json"
Ubuntu:Pro:18.04:LTS
libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=esm-infra%2Fbionic

Affected ranges

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

Affected versions

2.*
2.9.4+dfsg1-4ubuntu1
2.9.4+dfsg1-5ubuntu1
2.9.4+dfsg1-5ubuntu2
2.9.4+dfsg1-5.1ubuntu1
2.9.4+dfsg1-5.2ubuntu1
2.9.4+dfsg1-6.1ubuntu1
2.9.4+dfsg1-6.1ubuntu1.2
2.9.4+dfsg1-6.1ubuntu1.3
2.9.4+dfsg1-6.1ubuntu1.4
2.9.4+dfsg1-6.1ubuntu1.5
2.9.4+dfsg1-6.1ubuntu1.6
2.9.4+dfsg1-6.1ubuntu1.7
2.9.4+dfsg1-6.1ubuntu1.8
2.9.4+dfsg1-6.1ubuntu1.9
2.9.4+dfsg1-6.1ubuntu1.9+esm1
2.9.4+dfsg1-6.1ubuntu1.9+esm2
2.9.4+dfsg1-6.1ubuntu1.9+esm3
2.9.4+dfsg1-6.1ubuntu1.9+esm4
2.9.4+dfsg1-6.1ubuntu1.9+esm5
2.9.4+dfsg1-6.1ubuntu1.9+esm6
2.9.4+dfsg1-6.1ubuntu1.9+esm7

Ecosystem specific 

{
    "priority_reason": "This is only a crash in a command line tool with no security impact.",
    "binaries": [
        {
            "binary_name": "libxml2",
            "binary_version": "2.9.4+dfsg1-6.1ubuntu1.9+esm7"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.4+dfsg1-6.1ubuntu1.9+esm7"
        },
        {
            "binary_name": "python-libxml2",
            "binary_version": "2.9.4+dfsg1-6.1ubuntu1.9+esm7"
        },
        {
            "binary_name": "python3-libxml2",
            "binary_version": "2.9.4+dfsg1-6.1ubuntu1.9+esm7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11979.json"
Ubuntu:Pro:20.04:LTS
libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=esm-infra%2Ffocal

Affected ranges

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

Affected versions

2.*
2.9.4+dfsg1-7ubuntu3
2.9.4+dfsg1-7ubuntu5
2.9.4+dfsg1-8ubuntu1
2.9.4+dfsg1-8ubuntu2
2.9.4+dfsg1-8ubuntu3
2.9.10+dfsg-1ubuntu3
2.9.10+dfsg-4build1
2.9.10+dfsg-5
2.9.10+dfsg-5ubuntu0.20.04.1
2.9.10+dfsg-5ubuntu0.20.04.2
2.9.10+dfsg-5ubuntu0.20.04.3
2.9.10+dfsg-5ubuntu0.20.04.4
2.9.10+dfsg-5ubuntu0.20.04.5
2.9.10+dfsg-5ubuntu0.20.04.6
2.9.10+dfsg-5ubuntu0.20.04.7
2.9.10+dfsg-5ubuntu0.20.04.8
2.9.10+dfsg-5ubuntu0.20.04.9
2.9.10+dfsg-5ubuntu0.20.04.10
2.9.10+dfsg-5ubuntu0.20.04.10+esm1
2.9.10+dfsg-5ubuntu0.20.04.10+esm2
2.9.10+dfsg-5ubuntu0.20.04.10+esm3
2.9.10+dfsg-5ubuntu0.20.04.10+esm4

Ecosystem specific 

{
    "priority_reason": "This is only a crash in a command line tool with no security impact.",
    "binaries": [
        {
            "binary_name": "libxml2",
            "binary_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm4"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm4"
        },
        {
            "binary_name": "python-libxml2",
            "binary_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm4"
        },
        {
            "binary_name": "python3-libxml2",
            "binary_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11979.json"