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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: perl: CVE-2026-12087
Message-ID: <178162106773.1585994.15855288776668819080.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0
Date: Tue, 16 Jun 2026 16:44:27 +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-2026-12087[0]:
| Socket versions before 2.041 for Perl have an out-of-bounds heap
| read.  In Socket.xs, pack_ip_mreq_source() checks the length of its
| source argument before the argument is read, so the check tests the
| byte length carried over from the preceding multiaddr argument
| instead. Both addresses occupy a 4-byte field, so a valid multiaddr
| lets a source of any length pass the check, and the source is then
| copied into the 4-byte imr_sourceaddr field with a fixed-size copy.
| A source shorter than 4 bytes is not rejected, and the copy reads up
| to 3 bytes past the end of its buffer.  Calling
| pack_ip_mreq_source() with a source value shorter than 4 bytes
| copies adjacent heap memory into the returned packed structure.


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-2026-12087
    https://www.cve.org/CVERecord?id=CVE-2026-12087
[1] https://lists.security.metacpan.org/cve-announce/msg/41020451/

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
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