Quick answers
- Is CVE-2026-57432 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-57432 being exploited in the wild.
- How severe is CVE-2026-57432?
- Informational severity, with a CVSS score of 0, published 13 July 2026.
- Which products and versions are affected?
- Perl Foundation Perl through 5.43.10.
- Is there a fix for CVE-2026-57432?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-57432 attacked?
- It is attacked with local access, in a software library.
- Am I affected by CVE-2026-57432?
- Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An integer overflow vulnerability exists in Perl's S_measure_struct function within pp_pack.c. The function fails to validate that the product of an item's size and its repeat count, when added to a running total, does not exceed the limits of a signed SSize_t. A large repeat count in a pack or unpack template can cause the total to wrap to a negative value. Subsequent position codes (@, X, and x) perform signed length comparisons that pass when the length is negative, allowing the buffer pointer to advance out of bounds. An attacker providing a malicious template can trigger an out-of-bounds heap read to leak memory contents. Patches have been developed to implement overflow checks using SSize_t_MAX.
Affected products
- Perl Foundation Perl through 5.43.10
Timeline
- 2026-07-13: disclosed
- 2026-07-13: advisory