DEBIAN-CVE-2026-13221

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Source
https://security-tracker.debian.org/tracker/CVE-2026-13221
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-13221.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-13221
Upstream
Published
2026-07-13T17:16:48Z
Modified
2026-09-12T10:00:14Z
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
Summary
[none]
Details

Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.10 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

Debian:12 / perl

Package

Name
perl
Purl
pkg:deb/debian/perl?arch=source&distro=bookworm

Affected ranges

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

Affected versions

5.*
5.36.0-7
5.36.0-7+deb12u1
5.36.0-7+deb12u2
5.36.0-7+deb12u3
5.36.0-8
5.36.0-9
5.36.0-10
5.38.0~rc2-1
5.38.0-1
5.38.0-2
5.38.2-1
5.38.2-2
5.38.2-3
5.38.2-3.1
5.38.2-3.2
5.38.2-3.2+hurd.1
5.38.2-4
5.38.2-5
5.40.0~rc1-1
5.40.0-1
5.40.0-2
5.40.0-3
5.40.0-4
5.40.0-5
5.40.0-6
5.40.0-7
5.40.0-8
5.40.1-1
5.40.1-2
5.40.1-3
5.40.1-4
5.40.1-5
5.40.1-6
5.40.1-7
5.40.1-8
5.42.0-1
5.42.0-2
5.42.0-3
5.42.2-1
5.42.2-2
5.42.2-3
5.42.3-1
5.44.0-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-13221.json"

Debian:13 / perl

Package

Name
perl
Purl
pkg:deb/debian/perl?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.40.1-6+deb13u1

Affected versions

5.*
5.40.1-6

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-13221.json"

Debian:14 / perl

Package

Name
perl
Purl
pkg:deb/debian/perl?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
5.42.3-1

Affected versions

5.*
5.40.1-6
5.40.1-7
5.40.1-8
5.42.0-1
5.42.0-2
5.42.0-3
5.42.2-1
5.42.2-2
5.42.2-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-13221.json"