Vulnerability Description
RE2JS is the JavaScript port of RE2, a regular expression engine that provides linear time matching. From 2.2.0 until 2.8.7, enabling LOOKBEHINDS and using repeated matching through matcher().find(), matchAll(), split(), or matcher().replaceAll() can cause quadratic total work. Machine.match restarts lookbehind scanning from offset zero for each requested start position, while Matcher-based APIs request capture slots that prevent the early exit used for captureless matching. Dense matches therefore repeatedly rescan the input, allowing attacker-influenced text to monopolize a single-threaded worker and deny service. This issue is fixed in version 2.8.7.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/le0pard/re2js/commit/dfdd947785dfa113bdc97416375c246a39458395
- https://github.com/le0pard/re2js/pull/59
- https://github.com/le0pard/re2js/releases/tag/2.8.7
- https://github.com/le0pard/re2js/security/advisories/GHSA-gg6h-894w-4m9c
FAQ
What is CVE-2026-116795?
CVE-2026-116795 is a vulnerability with a CVSS score of 7.5 (HIGH). RE2JS is the JavaScript port of RE2, a regular expression engine that provides linear time matching. From 2.2.0 until 2.8.7, enabling LOOKBEHINDS and using repeated matching through matcher().find(), ...
How severe is CVE-2026-116795?
CVE-2026-116795 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-116795?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.