CVE Watch14 jul 2026

CVE-2026-13221

Perl versions through 5.43.9 produce silently incorrect regular expression matches when an alternation of more than 65535 fixed string branc

CVSS

9.1

Crítico

EPSS

0.6%

p45

KEV

—

Exploit Today

0-100

Publicado: 13 jul 2026 · Última mod.: 14 jul 2026 · CWE-190

EPSS · 30d

0.2%EPSS · 30 días0.6%

2026-07-142026-07-17

Descripción técnica

Perl versions through 5.43.9 produce silently incorrect regular expression matches when an alternation of more than 65535 fixed string branches is compiled into a trie in Perl_study_chunk. When such branches are combined into a trie, the delta between the first branch and the shared tail is stored in a 16-bit field. A branch count above 65535 overflows the field, and the trie's match decision table is truncated with no warning or error. A pattern of this shape produces false positive matches (matching strings it should not) and false negative matches (failing to match strings it should). When such a pattern gates an access or filtering decision, the result is wrong.

Referencias oficiales

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