CVE-2026-8376

Severity by source

Trivy's own label is CRITICAL. Rated critical by NVD, Photon OS. Rated lower by Red Hat (medium), Amazon (medium), Azure Linux (medium), Ubuntu (medium).

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 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.

Affected packages and fixed versions

References

• http://www.openwall.com/lists/oss-security/2026/05/26/1
• https://access.redhat.com/security/cve/CVE-2026-8376
• https://github.com/Perl/perl5/commit/5e7f119eb2bb1181be908701f22bf7068e722f1c.patch
• https://github.com/Perl/perl5/pull/24433
• https://nvd.nist.gov/vuln/detail/CVE-2026-8376
• https://ubuntu.com/security/notices/USN-8467-1
• https://www.cve.org/CVERecord?id=CVE-2026-8376