An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \X is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to parse untrusted input may be vulnerable to this flaw, which would allow an attacker to crash the application. The flaw occurs in do_extuni_no_utf in pcre2_jit_compile.c.
https://bugs.php.net/bug.php?id=78338
https://bugs.exim.org/show_bug.cgi?id=2421
https://bugzilla.redhat.com/show_bug.cgi?id=1735494
https://vcs.pcre.org/pcre2?view=revision&revision=1092
Source: MITRE
Published: 2020-02-14
Updated: 2023-01-27
Type: CWE-125
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH