CVE-2026-89160 PCRE CVE debrief

Who should care

Defenders responsible for maintaining systems that use the PCRE2 library should assess their exposure and consider upgrading to version 10.48 or later.

Why it matters

A low-severity vulnerability in PCRE2 before version 10.48 could lead to an out-of-bounds read during matching of an invalid UTF subject, requiring defenders to verify their system's PCRE2 version and consider upgrading.

• Verify version of PCRE2 used in systems
• Potential for out-of-bounds read during matching of invalid UTF subject
• Consider upgrading to PCRE2 version 10.48 or later

Technical summary

The PCRE2 library before version 10.48 has a vulnerability that allows for an out-of-bounds read during the matching of an invalid UTF subject. This vulnerability is particularly relevant for systems that use PCRE2 for handling UTF subjects. The vulnerability can be mitigated by upgrading to PCRE2 version 10.48 or later. Defenders should prioritize verifying the version of PCRE2 used in their systems and consider necessary updates to prevent potential exploitation.

Defensive priority

Defenders should prioritize verifying the version of PCRE2 used in their systems and consider upgrading to version 10.48 or later.

Recommended defensive actions

• Verify the version of PCRE2 used in your systems
• Consider upgrading to PCRE2 version 10.48 or later
• Monitor system logs for potential exploitation attempts

Evidence notes

The CVE record and NVD vulnerability detail page provide information about the vulnerability, but the scope of affected systems and versions is not explicitly stated.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.