CVE-2025-58050

In pcre2 library, there is a vulnerability in the code that causes a heap-buffer-overflow. This arises from using the special verb - Scan-SubString together with (*ACCEPT) which causes an out-of-bounds read. This could be exploited by an attacker through crafting a pattern using this combination to trigger the heap-buffer overflow.

The bug is in src/pcre2_match.c. When (*scs:...) temporarily restricts the match boundaries to a captured substring, the engine restores the current subject pointer (Feptr) correctly on an immediate (*ACCEPT), but it fails to restore mb->end_subject and mb->true_end_subject. If execution later calls match_ref (for example for a backreference like \2), the bounds check can underflow because mb->end_subject - eptr becomes negative and is cast to an unsigned size. That makes the length check pass incorrectly and memcmp reads past the end of the allocated buffer, causing a heap-buffer-overflow read.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.