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

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Summary

CVECVE-2026-57432
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-13 17:17:55 UTC
Updated2026-07-13 20:16:48 UTC
DescriptionPerl 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.

Risk And Classification

Problem Types: CWE-125 | CWE-190 | CWE-190 CWE-190 Integer Overflow or Wraparound | CWE-125 CWE-125 Out-of-bounds Read

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SHAY Perl affected 5.43.10 custom Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/07/13/6 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/Perl/perl5/commit/40754edc72dd3e513d758153c0e2f0215897740e.patch 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
github.com/Perl/perl5/commit/5f7eb6bbbe0510964e3fb1d6bb691e5445913e55.patch 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Apply the upstream patches. The fix is included in the Perl 5.43.11 development release.

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