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.
Metrics
Affected Vendors & Products
References
History
Tue, 14 Jul 2026 14:30:00 +0000
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Mon, 13 Jul 2026 17:45:00 +0000
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Mon, 13 Jul 2026 16:30:00 +0000
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| 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. | |
| Title | 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 | |
| Weaknesses | CWE-125 CWE-190 |
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| References |
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Status: PUBLISHED
Assigner: CPANSec
Published: 2026-07-13T15:38:20.728Z
Updated: 2026-07-14T13:34:42.360Z
Reserved: 2026-06-24T13:09:26.322Z
Link: CVE-2026-57432
Updated: 2026-07-13T19:30:46.712Z
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