VULNERABILITY INTELLIGENCE

CVE-2026-57432

CVSS score8.4 HIGH
EPSS probability0.21%
CISA KEVNot currently listed
Published2026-07-13
Last modified2026-10-24
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 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.

Weakness classification

  • 9b29abf9-4ab0-4765-b253-1875cd9b441e: CWE-125

Primary references