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
| Source | ID | Title |
|---|---|---|
Ubuntu USN |
USN-8684-1 | Perl vulnerabilities |
Solution
Apply the upstream patches. The fix is included in the Perl 5.43.11 development release.
Workaround
No workaround given by the vendor.
Tue, 14 Jul 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
cvssV3_1
|
Mon, 13 Jul 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Shay
Shay perl |
|
| 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 |
|
| References |
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Projects
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Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-07-14T13:34:42.360Z
Reserved: 2026-06-24T13:09:26.322Z
Link: CVE-2026-57432
Updated: 2026-07-14T13:34:35.440Z
Status : Analyzed
Published: 2026-07-13T17:17:55.670
Modified: 2026-07-14T18:04:48.367
Link: CVE-2026-57432
No data.
OpenCVE Enrichment
Updated: 2026-07-31T11:45:13Z
Ubuntu USN