Medium [CVE-2026-89157] Out-of-bounds write via large pattern input
This medium-severity Red Hat Linux advisory covers CVE-2026-89157 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in PCRE2. On 32-bit platforms, an attacker can provide a specially crafted large pattern, leading to an out-of-bounds write within the pcre2_pattern_convert function.
This vulnerability can result in high integrity impact, such as data corruption, and potentially a low availability impact, causing a denial of service. This out-of-bounds write vulnerability in PCRE2 on 32-bit platforms could lead to data corruption with high integrity impact and potential denial of service.
Exploitation requires an attacker to provide a specially crafted large pattern, but no privileges or user interaction are needed. Red Hat severity: Moderate — CVSS 5.7 (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L).
Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images; Red Hat OpenShift Container Platform 4.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: mariadb10.11; Red Hat package: mariadb11.8; Red Hat package: mingw-pcre2; Red Hat package: pcre2.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 29 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 29 minutes ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 29 minutes ago·verify at source
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