CVE-2026-8376
Publication date 26 May 2026
Last updated 26 June 2026
Ubuntu priority
Description
Perl versions through 5.43.10 have a heap buffer overflow when compiling regular expressions with a repeated fixed string on 32-bit builds. Perl_study_chunk in regcomp_study.c checked the size of the joined substring buffer in characters rather than bytes. For a quantified fixed substring with a large minimum count, the byte length mincount * l could overflow SSize_t, producing an undersized SvGROW allocation; the subsequent copy writes past the end of the buffer. A caller that compiles an attacker-controlled regular expression on a 32-bit perl build triggers a heap buffer overflow at compile time.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| perl | 26.04 LTS resolute |
Fixed 5.40.1-7ubuntu0.1
|
| 25.10 questing |
Vulnerable
|
|
| 24.04 LTS noble |
Fixed 5.38.2-3.2ubuntu0.3
|
|
| 22.04 LTS jammy |
Fixed 5.34.0-3ubuntu1.7
|
|
| 20.04 LTS focal |
Fixed 5.30.0-9ubuntu0.5+esm2
|
|
| 18.04 LTS bionic |
Fixed 5.26.1-6ubuntu0.7+esm2
|
|
| 16.04 LTS xenial |
Fixed 5.22.1-9ubuntu0.9+esm2
|
|
| 14.04 LTS trusty |
Fixed 5.18.2-2ubuntu1.7+esm7
|
Get expanded security coverage with Ubuntu Pro
Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.
Get Ubuntu Pro 30-day free trialSeverity score breakdown
CVSS version: CVSS v3.0
Base score
9.8 · Critical
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8467-1
- Perl vulnerabilities
- 24 June 2026