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CVE-2026-57432 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

CVE-2026-57432 (CVSS 8.4 High) is an integer overflow in Perl's `S_measure_struct` function that leads to an out-of-bounds heap read when processing `pack` or `unpack` operations. The vulnerability affects Perl versions up to and including 5.43.10.
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