Out-of-bounds read in PCRE2 - #VU146523
Published: August 31, 2026
Vulnerability identifier: #VU146523
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds read in pcre2_match() when processing invalid UTF subjects after JIT fallback to the interpreter. A remote attacker can pass a specially crafted invalid UTF subject to cause a denial of service.
Exploitation requires UTF matching, JIT support, a non-zero starting offset, and a pattern with lookbehind in the 8-bit library.
Affected software
PCRE2
Remediation
Install security update from vendor's website.
PCRE2 - update to 10.48