CRITICAL 9.1
PYSEC-2025-259
Details
The PCRE2 library is a set of C functions that implement regular expression pattern matching. In version 10.45, a heap-buffer-overflow read vulnerability exists in the PCRE2 regular expression matching engine, specifically within the handling of the (*scs:...) (Scan SubString) verb when combined with (*ACCEPT) in src/pcre2_match.c. This vulnerability may potentially lead to information disclosure if the out-of-bounds data read during the memcmp affects the final match result in a way observable by the attacker. This issue has been resolved in version 10.46.
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Affected packages
PyPI / pcre2
Introduced in:
0 No fixed version published yet for pcre2 (pip). Pin to a known-safe version or switch to an alternative.