CVE-2019-20454

Name of the Vulnerable Software and Affected Versions PCRE versions prior to 10.34

Description An out-of-bounds read was discovered in PCRE when the pattern X is JIT compiled and used to match specially crafted subjects in non-UTF mode. This issue affects applications that use PCRE to parse untrusted input, allowing an attacker to crash the application. The flaw occurs in the do extuni no utf function in pcre2 jit compile.c.

Recommendations For versions prior to 10.34, update to version 10.34 or later to resolve the issue. As a temporary workaround, consider avoiding the use of the X pattern in JIT compiled regular expressions until a patch is available. Restrict access to untrusted input to minimize the risk of exploitation.