CVE-2026-8376

Severidad por fuente

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Descripción

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.

Paquetes afectados y versiones corregidas

Referencias

• 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