tarteaucitron.js before 1.37.0 ReDoS via Unescaped Cookie Name in cookie.purge

Summary

tarteaucitron.js before 1.37.0 contains a regular expression denial of service vulnerability that allows attackers to block visitor pages by supplying unescaped cookie names to cookie.purge. Attackers can plant a cookie from a sibling subdomain or inject a purgeBtn element with a catastrophic-backtracking data-cookie pattern that freezes the page when the purge button is clicked.

Evidence

Reported to the maintainer with a proof of concept that reproduced against the affected release.

Remediation

Upgrade tarteaucitronjs to 1.37.0 or later.

References

• VulnCheck advisoryhttps://www.vulncheck.com/advisories/tarteaucitron-js-before-1.37.0-redos-via-unescaped-cookie-name-in-cookie-purge
• Fix commithttps://github.com/AmauriC/tarteaucitron.js/commit/60faaba5fd541cad770549d422fc4ac7de657e56
• Vulnerable codehttps://github.com/AmauriC/tarteaucitron.js/blob/v1.36.0/tarteaucitron.js#L2169-L2175
• CVE recordhttps://www.cve.org/CVERecord?id=CVE-2026-111714