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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| SHAY | perl | unaffected |
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Perl
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Solution
Apply the upstream patches. The fix is included in the Perl 5.43.11 development release.
Workaround
No workaround given by the vendor.
Mon, 13 Jul 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Shay
Shay perl |
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| Vendors & Products |
Shay
Shay perl |
Mon, 13 Jul 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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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Projects
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-07-13T19:30:46.712Z
Reserved: 2026-06-24T13:09:26.322Z
Link: CVE-2026-57432
Vulnrichment
No data.
NVD
No data.
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-07-13T17:30:04Z