CVE-2026-111714 AmauriC CVE debrief

Who should care

Defenders responsible for web applications using tarteaucitron.js should assess exposure and prioritize verification and potential upgrades or mitigations. They should review relevant monitoring, detection, and logs for exposed assets that need extra review. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented.

Why it matters

CVE-2026-111714 is a regular expression denial of service vulnerability in tarteaucitron.js before 1.37.0 that can cause pages to freeze via unescaped cookie names in cookie.purge. Defenders should prioritize verifying exposure in web applications, assessing upgrade feasibility to 1.37.0, and implementing compensating controls or monitoring as needed.

• Potential denial of service through page freezing.
• Need to verify exposure in web applications using tarteaucitron.js versions before 1.37.0.
• Possible need for compensating controls if upgrades are not feasible.
• Importance of monitoring web application performance for signs of ReDoS attacks.

Technical summary

tarteaucitron.js before 1.37.0 contains a regular expression denial of service vulnerability in cookie.purge that can freeze pages via unescaped cookie names. This issue can be exploited by supplying malicious cookie names to cookie.purge, potentially causing a denial of service. The vulnerability allows attackers to 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. Defenders should prioritize verifying exposure in web applications using tarteaucitron.js versions before 1.37.0 and assess the feasibility of upgrading to 1.37.0 or applying compensating controls.

Defensive priority

Defenders should prioritize verifying exposure in web applications using tarteaucitron.js versions before 1.37.0 and assess the feasibility of upgrading to 1.37.0 or applying compensating controls.

Recommended defensive actions

• Verify if web applications using tarteaucitron.js are exposed to versions before 1.37.0.
• Assess the feasibility of upgrading to tarteaucitron.js version 1.37.0.
• Implement compensating controls to mitigate potential ReDoS attacks.
• Monitor web application performance for signs of ReDoS attacks.
• Review relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the vulnerability in tarteaucitron.js before 1.37.0. Limited information is available on actual exploitation or victim impact. Defenders should verify if web applications using tarteaucitron.js are exposed to versions before 1.37.0 and assess the feasibility of upgrading to 1.37.0. The vulnerability allows attackers to plant a cookie from a sibling subdomain or inject a purgeBtn element with a catastrophic-backtracking data-cookie pattern. There is no information on publicly available

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.