UBUNTU-CVE-2026-13221

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Source
https://ubuntu.com/security/CVE-2026-13221
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13221.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-13221
Upstream
Downstream
Related
Published
2026-07-13T17:16:00Z
Modified
2026-09-10T00:56:42Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H CVSS Calculator
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Perl versions through 5.43.9 produce silently incorrect regular expression matches when an alternation of more than 65535 fixed string branches is compiled into a trie in Perl_study_chunk. When such branches are combined into a trie, the delta between the first branch and the shared tail is stored in a 16-bit field. A branch count above 65535 overflows the field, and the trie's match decision table is truncated with no warning or error. A pattern of this shape produces false positive matches (matching strings it should not) and false negative matches (failing to match strings it should). When such a pattern gates an access or filtering decision, the result is wrong.

References

Affected packages

Ubuntu:22.04:LTS
perl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.34.0-3ubuntu1.8

Affected versions

5.*
5.32.1-3ubuntu3
5.34.0-3ubuntu1
5.34.0-3ubuntu1.1
5.34.0-3ubuntu1.2
5.34.0-3ubuntu1.3
5.34.0-3ubuntu1.4
5.34.0-3ubuntu1.5
5.34.0-3ubuntu1.7

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libperl5.34",
            "binary_version": "5.34.0-3ubuntu1.8"
        },
        {
            "binary_name": "perl",
            "binary_version": "5.34.0-3ubuntu1.8"
        },
        {
            "binary_name": "perl-base",
            "binary_version": "5.34.0-3ubuntu1.8"
        },
        {
            "binary_name": "perl-debug",
            "binary_version": "5.34.0-3ubuntu1.8"
        },
        {
            "binary_name": "perl-modules-5.34",
            "binary_version": "5.34.0-3ubuntu1.8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13221.json"
Ubuntu:24.04:LTS
perl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.38.2-3.2ubuntu0.4

Affected versions

5.*
5.36.0-9ubuntu1
5.36.0-10ubuntu1
5.38.2-3
5.38.2-3.2
5.38.2-3.2build1
5.38.2-3.2build2
5.38.2-3.2build2.1
5.38.2-3.2ubuntu0.1
5.38.2-3.2ubuntu0.2
5.38.2-3.2ubuntu0.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libperl5.38t64",
            "binary_version": "5.38.2-3.2ubuntu0.4"
        },
        {
            "binary_name": "perl",
            "binary_version": "5.38.2-3.2ubuntu0.4"
        },
        {
            "binary_name": "perl-base",
            "binary_version": "5.38.2-3.2ubuntu0.4"
        },
        {
            "binary_name": "perl-debug",
            "binary_version": "5.38.2-3.2ubuntu0.4"
        },
        {
            "binary_name": "perl-modules-5.38",
            "binary_version": "5.38.2-3.2ubuntu0.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13221.json"
Ubuntu:26.04:LTS
perl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.40.1-7ubuntu0.3

Affected versions

5.*
5.40.1-6build1
5.40.1-7build1
5.40.1-7ubuntu0.1
5.40.1-7ubuntu0.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libperl5.40",
            "binary_version": "5.40.1-7ubuntu0.3"
        },
        {
            "binary_name": "perl",
            "binary_version": "5.40.1-7ubuntu0.3"
        },
        {
            "binary_name": "perl-base",
            "binary_version": "5.40.1-7ubuntu0.3"
        },
        {
            "binary_name": "perl-debug",
            "binary_version": "5.40.1-7ubuntu0.3"
        },
        {
            "binary_name": "perl-modules-5.40",
            "binary_version": "5.40.1-7ubuntu0.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13221.json"
Ubuntu:Pro:14.04:LTS
perl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.18.2-2ubuntu1.7+esm8

Affected versions

5.*
5.14.2-21build1
5.18.1-4
5.18.1-4build1
5.18.1-5
5.18.2-2
5.18.2-2ubuntu1
5.18.2-2ubuntu1.1
5.18.2-2ubuntu1.3
5.18.2-2ubuntu1.4
5.18.2-2ubuntu1.6
5.18.2-2ubuntu1.7
5.18.2-2ubuntu1.7+esm3
5.18.2-2ubuntu1.7+esm4
5.18.2-2ubuntu1.7+esm5
5.18.2-2ubuntu1.7+esm7

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libcgi-fast-perl",
            "binary_version": "5.18.2-2ubuntu1.7+esm8"
        },
        {
            "binary_name": "libperl5.18",
            "binary_version": "5.18.2-2ubuntu1.7+esm8"
        },
        {
            "binary_name": "perl",
            "binary_version": "5.18.2-2ubuntu1.7+esm8"
        },
        {
            "binary_name": "perl-base",
            "binary_version": "5.18.2-2ubuntu1.7+esm8"
        },
        {
            "binary_name": "perl-debug",
            "binary_version": "5.18.2-2ubuntu1.7+esm8"
        },
        {
            "binary_name": "perl-modules",
            "binary_version": "5.18.2-2ubuntu1.7+esm8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13221.json"
Ubuntu:Pro:16.04:LTS
perl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.22.1-9ubuntu0.9+esm3

Affected versions

5.*
5.20.2-6
5.22.1-3
5.22.1-4
5.22.1-5
5.22.1-7
5.22.1-8
5.22.1-9
5.22.1-9ubuntu0.2
5.22.1-9ubuntu0.3
5.22.1-9ubuntu0.5
5.22.1-9ubuntu0.6
5.22.1-9ubuntu0.9
5.22.1-9ubuntu0.9+esm1
5.22.1-9ubuntu0.9+esm2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libperl5.22",
            "binary_version": "5.22.1-9ubuntu0.9+esm3"
        },
        {
            "binary_name": "perl",
            "binary_version": "5.22.1-9ubuntu0.9+esm3"
        },
        {
            "binary_name": "perl-base",
            "binary_version": "5.22.1-9ubuntu0.9+esm3"
        },
        {
            "binary_name": "perl-debug",
            "binary_version": "5.22.1-9ubuntu0.9+esm3"
        },
        {
            "binary_name": "perl-modules-5.22",
            "binary_version": "5.22.1-9ubuntu0.9+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13221.json"
Ubuntu:Pro:18.04:LTS
perl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.26.1-6ubuntu0.7+esm3

Affected versions

5.*
5.26.0-8ubuntu1
5.26.1-2ubuntu1
5.26.1-3
5.26.1-4
5.26.1-4build1
5.26.1-5
5.26.1-6
5.26.1-6ubuntu0.1
5.26.1-6ubuntu0.2
5.26.1-6ubuntu0.3
5.26.1-6ubuntu0.5
5.26.1-6ubuntu0.6
5.26.1-6ubuntu0.7
5.26.1-6ubuntu0.7+esm2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libperl5.26",
            "binary_version": "5.26.1-6ubuntu0.7+esm3"
        },
        {
            "binary_name": "perl",
            "binary_version": "5.26.1-6ubuntu0.7+esm3"
        },
        {
            "binary_name": "perl-base",
            "binary_version": "5.26.1-6ubuntu0.7+esm3"
        },
        {
            "binary_name": "perl-debug",
            "binary_version": "5.26.1-6ubuntu0.7+esm3"
        },
        {
            "binary_name": "perl-modules-5.26",
            "binary_version": "5.26.1-6ubuntu0.7+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13221.json"
Ubuntu:Pro:20.04:LTS
perl

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.30.0-9ubuntu0.5+esm3

Affected versions

5.*
5.28.1-6build1
5.30.0-7
5.30.0-9
5.30.0-9build1
5.30.0-9ubuntu0.2
5.30.0-9ubuntu0.3
5.30.0-9ubuntu0.4
5.30.0-9ubuntu0.5
5.30.0-9ubuntu0.5+esm2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libperl5.30",
            "binary_version": "5.30.0-9ubuntu0.5+esm3"
        },
        {
            "binary_name": "perl",
            "binary_version": "5.30.0-9ubuntu0.5+esm3"
        },
        {
            "binary_name": "perl-base",
            "binary_version": "5.30.0-9ubuntu0.5+esm3"
        },
        {
            "binary_name": "perl-debug",
            "binary_version": "5.30.0-9ubuntu0.5+esm3"
        },
        {
            "binary_name": "perl-modules-5.30",
            "binary_version": "5.30.0-9ubuntu0.5+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-13221.json"