UBUNTU-CVE-2026-74860

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-74860
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-74860.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-74860
Upstream
  • CVE-2026-74860
Downstream
Related
Published
2026-09-08T12:16:00Z
Modified
2026-09-21T21:42:18Z
Severity
  • 8.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in libxml2 with Python bindings enabled. A remote attacker could exploit this vulnerability by providing a specially crafted XML document containing a Document Type Definition (DTD) with enumerated attribute values. This triggers a double-free error in the SAX attributeDecl callback handler, where a string is freed twice. This flaw can lead to a denial of service (DoS) due to a reproducible crash in Python applications using the libxml2 SAX bindings.

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
0 Unknown introduced version / All previous versions are affected
Fixed
2.9.13+dfsg-1ubuntu0.13

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 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libxml2",
            "binary_version":  "2.9.13+dfsg-1ubuntu0.13"
        },
        {
            "binary_name":  "libxml2-utils",
            "binary_version":  "2.9.13+dfsg-1ubuntu0.13"
        },
        {
            "binary_name":  "python3-libxml2",
            "binary_version":  "2.9.13+dfsg-1ubuntu0.13"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-74860.json"
Ubuntu:24.04:LTS
libxml2

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.9.14+dfsg-1.3ubuntu3.9

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 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libxml2",
            "binary_version":  "2.9.14+dfsg-1.3ubuntu3.9"
        },
        {
            "binary_name":  "libxml2-utils",
            "binary_version":  "2.9.14+dfsg-1.3ubuntu3.9"
        },
        {
            "binary_name":  "python3-libxml2",
            "binary_version":  "2.9.14+dfsg-1.3ubuntu3.9"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-74860.json"
Ubuntu:26.04:LTS
libxml2

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.15.2+dfsg-0.1ubuntu0.2

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 

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libxml2-16",
            "binary_version":  "2.15.2+dfsg-0.1ubuntu0.2"
        },
        {
            "binary_name":  "libxml2-source",
            "binary_version":  "2.15.2+dfsg-0.1ubuntu0.2"
        },
        {
            "binary_name":  "libxml2-utils",
            "binary_version":  "2.15.2+dfsg-0.1ubuntu0.2"
        },
        {
            "binary_name":  "python3-libxml2",
            "binary_version":  "2.15.2+dfsg-0.1ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-74860.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
0 Unknown introduced version / All previous versions are affected
Fixed
2.9.1+dfsg1-3ubuntu4.13+esm12

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 

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libxml2",
            "binary_version":  "2.9.1+dfsg1-3ubuntu4.13+esm12"
        },
        {
            "binary_name":  "libxml2-utils",
            "binary_version":  "2.9.1+dfsg1-3ubuntu4.13+esm12"
        },
        {
            "binary_name":  "python-libxml2",
            "binary_version":  "2.9.1+dfsg1-3ubuntu4.13+esm12"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-74860.json"
Ubuntu:Pro:16.04:LTS
libxml2

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.9.3+dfsg1-1ubuntu0.7+esm13

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 

{
    "availability":  "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libxml2",
            "binary_version":  "2.9.3+dfsg1-1ubuntu0.7+esm13"
        },
        {
            "binary_name":  "libxml2-utils",
            "binary_version":  "2.9.3+dfsg1-1ubuntu0.7+esm13"
        },
        {
            "binary_name":  "python-libxml2",
            "binary_version":  "2.9.3+dfsg1-1ubuntu0.7+esm13"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-74860.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
0 Unknown introduced version / All previous versions are affected
Fixed
2.9.4+dfsg1-6.1ubuntu1.9+esm8

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 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libxml2",
            "binary_version":  "2.9.4+dfsg1-6.1ubuntu1.9+esm8"
        },
        {
            "binary_name":  "libxml2-utils",
            "binary_version":  "2.9.4+dfsg1-6.1ubuntu1.9+esm8"
        },
        {
            "binary_name":  "python-libxml2",
            "binary_version":  "2.9.4+dfsg1-6.1ubuntu1.9+esm8"
        },
        {
            "binary_name":  "python3-libxml2",
            "binary_version":  "2.9.4+dfsg1-6.1ubuntu1.9+esm8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-74860.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
0 Unknown introduced version / All previous versions are affected
Fixed
2.9.10+dfsg-5ubuntu0.20.04.10+esm5

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 

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "libxml2",
            "binary_version":  "2.9.10+dfsg-5ubuntu0.20.04.10+esm5"
        },
        {
            "binary_name":  "libxml2-utils",
            "binary_version":  "2.9.10+dfsg-5ubuntu0.20.04.10+esm5"
        },
        {
            "binary_name":  "python-libxml2",
            "binary_version":  "2.9.10+dfsg-5ubuntu0.20.04.10+esm5"
        },
        {
            "binary_name":  "python3-libxml2",
            "binary_version":  "2.9.10+dfsg-5ubuntu0.20.04.10+esm5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-74860.json"