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CVE-2026-57432
Publication date 13 July 2026
Last updated 16 September 2026
Ubuntu priority
Description
Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| perl | 26.10 stonking |
Not affected
|
| 26.04 LTS resolute |
Fixed in 5.40.1-7ubuntu0.3
|
|
| 24.04 LTS noble |
Fixed in 5.38.2-3.2ubuntu0.4
|
|
| 22.04 LTS jammy |
Fixed in 5.34.0-3ubuntu1.8
|
|
| 20.04 LTS focal |
Fixed in 5.30.0-9ubuntu0.5+esm3
|
|
| 18.04 LTS bionic |
Fixed in 5.26.1-6ubuntu0.7+esm3
|
|
| 16.04 LTS xenial |
Fixed in 5.22.1-9ubuntu0.9+esm3
|
|
| 14.04 LTS trusty |
Fixed in 5.18.2-2ubuntu1.7+esm8
|
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CVSS version: CVSS v3.0
Base score
8.4 · High
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8675-1
- Perl vulnerabilities
- 25 August 2026
- USN-8684-1
- Perl vulnerabilities
- 27 August 2026
- USN-8675-2
- Perl vulnerabilities
- 9 September 2026