CVE-2026-12087 Affecting perl package, versions <5.42.3-1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.37% (31st percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-PERL-17345871
  • published16 Jun 2026
  • disclosed15 Jun 2026

Introduced: 15 Jun 2026

CVE-2026-12087  (opens in a new tab)

How to fix?

Upgrade Debian:unstable perl to version 5.42.3-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perl package and not the perl package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1