CVE-2026-89157 Memory corruption in PCRE2

Medium 5.7 Published 11 Sep 2026 Updated 11 Sep 2026

An out-of-bounds write in PCRE2 on 32-bit platforms allows attackers to cause memory corruption via large patterns, potentially leading to code execution or crashes.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-89157?

CVE-2026-89157 is a medium-severity memory corruption vulnerability in PCRE2, published on 11 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

PCRE2 before 10.48, on 32-bit platforms, has a pcre2_pattern_convert out-of-bounds write when an attacker can provide a large pattern.

Weakness: CWE-190

Which versions are affected by CVE-2026-89157?

It affects 1 product.

Products include Pcre Pcre2.

How do I fix CVE-2026-89157?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-89157 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89157 exists.

Sources

Also known as ALPINE-CVE-2026-89157, AZL-100059, AZL-101114, AZL-101748, AZL-101760, AZL-101811 and 9 more.