Vulnerability Description
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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Perl | Perl | <= 5.43.10 |
Related Weaknesses (CWE)
References
- https://github.com/Perl/perl5/commit/40754edc72dd3e513d758153c0e2f0215897740e.paPatch
- https://github.com/Perl/perl5/commit/5f7eb6bbbe0510964e3fb1d6bb691e5445913e55.paPatch
- http://www.openwall.com/lists/oss-security/2026/07/13/6Mailing ListPatchThird Party Advisory
FAQ
What is CVE-2026-57432?
CVE-2026-57432 is a vulnerability with a CVSS score of 8.4 (HIGH). 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...
How severe is CVE-2026-57432?
CVE-2026-57432 has been rated HIGH with a CVSS base score of 8.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-57432?
Check the references section above for vendor advisories and patch information. Affected products include: Perl Perl.