CVE-2026-57432
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.
Metadata
Severity & Metrics
No CVSS data available.
Affected products (1)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| SHAY | perl | — | 0 ≤ 5.43.10 |
Weakness (CWE)
References (2)