UBUNTU-CVE-2026-57432

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UBUNTU-CVE-2026-57432

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2026-57432, https://www.cve.org/CVERecord?id=CVE-2026-57432, https://lists.security.metacpan.org/cve-announce/msg/41780102/, https://ubuntu.com/security/notices/USN-8675-1, https://ubuntu.com/security/notices/USN-8684-1, https://ubuntu.com/security/notices/USN-8675-2