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 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.
References
| Link | Resource |
|---|---|
| https://github.com/Perl/perl5/commit/5e7f119eb2bb1181be908701f22bf7068e722f1c.patch | Patch |
| http://www.openwall.com/lists/oss-security/2026/05/26/1 | Mailing List Third Party Advisory |
Configurations
History
No history.
Information
Published : 2026-05-26 00:16
Updated : 2026-09-08 22:19
NVD link : CVE-2026-8376
Mitre link : CVE-2026-8376
CVE.ORG link : CVE-2026-8376
JSON object : View
Products Affected
perl
- perl
CWE
CWE-680
Integer Overflow to Buffer Overflow