Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Perl | Perl | <= 5.43.10 |
Related Weaknesses (CWE)
References
- https://github.com/Perl/perl5/commit/5e7f119eb2bb1181be908701f22bf7068e722f1c.paPatch
- http://www.openwall.com/lists/oss-security/2026/05/26/1Mailing ListThird Party Advisory
FAQ
What is CVE-2026-8376?
CVE-2026-8376 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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...
How severe is CVE-2026-8376?
CVE-2026-8376 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-8376?
Check the references section above for vendor advisories and patch information. Affected products include: Perl Perl.