CVE-2026-57432 Affecting perl package, versions <5.26.1-6ubuntu0.7+esm3


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.21% (12th percentile)

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  • Snyk IDSNYK-UBUNTU1804-PERL-17970643
  • published26 Aug 2026
  • disclosed13 Jul 2026

Introduced: 13 Jul 2026

CVE-2026-57432  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 perl to version 5.26.1-6ubuntu0.7+esm3 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 Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack.

S_measure_struct adds each item's size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds.

A template derived from untrusted input can read heap memory past the buffer and return it to the caller.

CVSS Base Scores

version 3.1