CVE-2026-103111 PCRE2Project CVE debrief

Who should care

Defenders and developers using PCRE2 with JIT API usage should assess exposure and prioritize patching. This includes operators, platforms, vulnerability-management teams, and security teams that may be impacted by the vulnerability. Review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-103111 PCRE2 vulnerability requires assessment and patching for systems using JIT API usage, with potential for arbitrary data writes and code execution.

• Potential for arbitrary data writes
• Possible code execution or denial of service
• Requires verification of affected versions and remediation

Technical summary

PCRE2 before 10.49 allows an out-of-bounds write with arbitrary data when there is an attacker-controlled regular expression and certain JIT API usage. This vulnerability requires assessment and patching for systems using JIT API usage, with potential for arbitrary data writes and code execution. Affected product deployments should be reviewed for exposure, and owners should prioritize patching.

Defensive priority

High-priority assessment and patching recommended for systems using PCRE2 with JIT API usage.

Recommended defensive actions

• Assess exposure and prioritize patching for systems using PCRE2 with JIT API usage
• Review and update regular expressions to prevent attacker-controlled input
• Monitor for potential exploitation attempts

Evidence notes

The CVE record and NVD entry provide details on the PCRE2 vulnerability, with a CVSS score of 7.6 and HIGH severity. Debian has announced a related advisory.

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.