CVE-2026-41248

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 75% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
41
EG Risk 41/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

Published

April 24, 2026

Last Modified

April 29, 2026

Advisory Details (1)

Auto-updated Aug 1, 2026
Patch available. Sources: github.
githubMentions a patch (unverified)

Middleware-based route protection bypass · Advisory · clerk/javascript · GitHub

https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9

Affected Packages

(4 across 1 ecosystem)
npm(4)
PackageVulnerable rangeFix by version rangeDependents
@clerk/astro—
  • 0.0.1 up to 1.5.7: fixed in 1.5.7
  • 2.0.0-snapshot.v20241206174604 up to 2.17.10: fixed in 2.17.10
  • 3.0.0 up to 3.0.15: fixed in 3.0.15
—
@clerk/nextjs—
  • 5.0.0 up to 5.7.6: fixed in 5.7.6
  • 6.0.0-snapshot.vb87a27f up to 6.39.2: fixed in 6.39.2
  • 7.0.0 up to 7.2.1: fixed in 7.2.1
—
@clerk/nuxt—
  • 1.1.0 up to 1.13.28: fixed in 1.13.28
  • 2.0.0 up to 2.2.2: fixed in 2.2.2
—
@clerk/shared—
  • 2.20.17 up to 2.22.1: fixed in 2.22.1
  • 3.0.0-canary.v20250225091530 up to 3.47.4: fixed in 3.47.4
  • 4.0.0 up to 4.8.1: fixed in 4.8.1
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 22× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 164 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
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  1. 2026-09-04 05:06 UTCEPSS rescore
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  25. 2026-08-12 17:46 UTCEG score recompute
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  27. 2026-08-11 16:40 UTCEG score recompute
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  29. 2026-08-11 02:07 UTCEG score recompute
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  40. 2026-08-04 15:10 UTCEPSS rescore
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  51. 2026-07-25 14:18 UTCEPSS rescore
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  54. 2026-07-23 03:11 UTCEG score recompute
  55. 2026-07-22 14:08 UTCEPSS rescore
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  57. 2026-07-20 22:02 UTCOSV refresh
  58. 2026-07-20 17:08 UTCEPSS rescore
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  74. 2026-07-06 02:23 UTCEPSS rescore
  75. 2026-07-06 02:23 UTCEPSS rescore

Related CVEs(same product + same CWE)

Same product

3 shown

npm:@clerk/shared · npm:@clerk/astro · npm:@clerk/nextjs

Frequently asked(5)

What is CVE-2026-41248?
CVE-2026-41248 is a critical vulnerability published on April 24, 2026. 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…
When was CVE-2026-41248 disclosed?
CVE-2026-41248 was first published on April 24, 2026, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41248 actively exploited?
CVE-2026-41248 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-41248?
CVE-2026-41248 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-41248?
A fix for CVE-2026-41248 is available: update to the fixed version the vendor names in its advisory.

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