tarteaucitron.js has Regular Expression Denial of Service (ReDoS) vulnerability

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.4 · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

EPSS

• CVE-2026-22809: 0.13% estimated exploitation activity in the next 30 days; percentile 2.44 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A potential Regular Expression Denial of Service (ReDoS) vulnerability was identified in tarteaucitron.js in the handling of the issuuid parameter. Details The issue was caused by the use of insufficiently constrained regular expressions applied to attacker-controlled input: if (issuuid.match(/\d+\/\d+/)) { issuuembed = '#' + issuuid; } else if (issuuid.match(/d=(.)&u=(.)/)) { issuuembed = '?' + issuuid; } These expressions are not anchored and rely on greedy patterns (.). When evaluated against specially crafted input, they may cause excessive backtracking, leading to high CPU consumption and potential denial of service. Impact An attacker able to control the issuuid parameter could exploit this vulnerability to degrade performance or cause temporary service unavailability through CPU exhaustion. No confidentiality or integrity impact was identified. Fix https://github.com/AmauriC/tarteaucitron.js/commit/f0bbdac2fdf3cd24a325fc0928c0d34abf1b7b52 The logic was simplified and…

Published by the source

13 Jan 2026, 20:35 UTC

Last modified by the source

3 Feb 2026, 02:59 UTC

Source last checked

26 Oct 2026, 12:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-q5f6-qxm2-mcqm

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-q5f6-qxm2-mcqm

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# Patch Next advisory brief: CVE-2026-22809

Advisory: tarteaucitron.js has Regular Expression Denial of Service (ReDoS) vulnerability
IDs: CVE-2026-22809, GHSA-q5f6-qxm2-mcqm
Record: https://patchnext.com/advisories/cve-2026-22809 (revision 2, source checked 26 Oct 2026, 12:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: tarteaucitronjs 1.29.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm tarteaucitronjs: affected < 1.29.0; fixed in 1.29.0

## Suggested inspection (read-only)
- `npm ls tarteaucitronjs --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on tarteaucitronjs.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-q5f6-qxm2-mcqm (OSV record GHSA-q5f6-qxm2-mcqm lists affected ranges: npm tarteaucitronjs >=0 <1.29.0 (fixed))
- Verified: https://github.com/advisories/GHSA-q5f6-qxm2-mcqm (GitHub-reviewed advisory GHSA-q5f6-qxm2-mcqm lists affected ranges: npm tarteaucitronjs >=0 <1.29.0)

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