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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: perl: CVE-2026-13221
Message-ID: <178401194330.128875.7384276524797586445.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Tue, 14 Jul 2026 08:52:23 +0200
Delivered-To: submit@bugs.debian.org

Source: perl
Version: 5.40.1-8
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for perl.

CVE-2026-13221[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-13221
    https://www.cve.org/CVERecord?id=CVE-2026-13221
[1] https://lists.security.metacpan.org/cve-announce/msg/41780104/

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
]