CVE-2026-41248Official Clerk JavaScript SDKs: Middleware-based route protection bypass
- 9.1CriticalCVSS base score
- 0.32%Exploitation in 30 daysEPSS · top 74% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Clerk JavaScript is the official JavaScript repository for Clerk authentication. createRouteMatcher in @clerk/nextjs, @clerk/nuxt, and @clerk/astro can be bypassed by certain crafted requests, allowing them to skip middleware gating and reach downstream handlers. This vulnerability is fixed in @clerk/astro 1.5.7, 2.17.10, and 3.0.15; @clerk/nextjs 5.7.6, 6.39.2, and 7.2.1; @clerk/nuxt 1.13.28 and 2.2.2; and @clerk/shared 2.22.1, 3.47.4, anc 4.8.1
Timeline
ID reserved
By GitHub_M
- 6 days later
· 6 days later
Published
- 3 days later
· 3 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Deferred | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.32% · top 74% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Affected products
- affected >= 0.0.1, < 1.5.7
- affected >= 2.0.0-snapshot.v20241206174604, <= 2.17.9
- affected >= 3.0.0, < 3.0.15
- affected >= 5.0.0, < 5.7.6
- affected >= 6.0.0-snapshot.vb87a27f, < 6.39.2
- affected >= 7.0.0, < 7.2.1
- affected >= 1.1.0, < 1.13.28
- affected >= 2.0.0, < 2.2.2
- affected >= 2.20.17, < 2.22.1
- affected >= 3.0.0-canary.v20250225091530, < 3.47.4
- affected >= 4.0.0, < 4.8.1
Affected packages
Affected packages4
From reviewed advisories of the GitHub Advisory Database.
- npm@clerk/astroGHSA-vqx2-fgx2-5wq9 (opens in a new tab)
- npm@clerk/nextjsGHSA-vqx2-fgx2-5wq9 (opens in a new tab)
- npm@clerk/nuxtGHSA-vqx2-fgx2-5wq9 (opens in a new tab)
- npm@clerk/sharedGHSA-vqx2-fgx2-5wq9 (opens in a new tab)
References
References1
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-25632 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-vqx2-fgx2-5wq9 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-41248)Record last updated .