CVE-2026-42349: Improper Check for Unusual or Exceptional Conditions

Clerk JavaScript is the official JavaScript repository for Clerk authentication. has, auth.protect, and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be...

@clerk/agent-toolkit (>=0.2.9-canary.v20251211104600, <=0.3.16-snapshot.v20260416221307), @clerk/astro (>=3.0.0-canary.v20251211104600, <=3.0.17-canary.v20260417194309) +10 more potentially affected by CVE-2026-42349 via @clerk/backend (>=3.0.0, <=3.2.13-canary.v20260417194309)

@clerk/backend NPM version =3.0.0, =0.2.9-canary.v20251211104600, =3.0.0-canary.v20251211104600, =2.0.0-canary.v20251211104600, =2.6.9-canary.v20251211104600, =0.0.1, =7.0.0-canary.v20251211104600, =2.0.0-canary.v20251211104600, =3.0.0-canary.v20251211104600, =1.0.0-canary.v20251211104600,...

@unhook/cli (>=0.9.3, <=0.15.0) potentially affected by CVE-2026-42349 via @clerk/backend (>=2.0.0, <=2.29.3)

@clerk/backend NPM version =2.0.0, =0.9.3, =0.15.0 Source cves: CVE-2026-42349 Source advisory: OSV:GHSA-W24R-5266-9C3C...

CVE-2026-34076

Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the...

CVE-2026-34076

Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the...

CVE-2026-34076

Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the...

CVE-2026-34076 Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host

Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the...

CVE-2026-34076 Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host

Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the...

EUVD-2026-17974

Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the...

CVE-2026-34076 Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host

Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the...

CVE-2026-34076: Server-Side Request Forgery (SSRF)

Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the...

@clerk/agent-toolkit (>=0.2.9-canary.v20251211104600, <=0.3.6-canary.v20260320105540), @clerk/astro (>=3.0.0-canary.v20251211104600, <=3.0.6-canary.v20260320105540) +9 more potentially affected by CVE-2026-34076 via @clerk/backend (>=3.0.0, <=3.2.2-canary.v20260320105540)

@clerk/backend NPM version =3.0.0, =0.2.9-canary.v20251211104600, =3.0.0-canary.v20251211104600, =2.0.0-canary.v20251211104600, =2.6.9-canary.v20251211104600, =0.0.1, =7.0.0-canary.v20251211104600, =2.0.0-canary.v20251211104600, =3.0.0-canary.v20251211104600, =1.0.0-canary.v20251211104600,...

@clerk/agent-toolkit (>=0.2.9-canary.v20251211104600, <=0.3.6-canary.v20260320105540), @clerk/astro (>=3.0.0-canary.v20251211104600, <=3.0.6-canary.v20260320105540) +9 more potentially affected by CVE-2026-34076 via @clerk/backend (>=3.0.0, <=3.2.2-canary.v20260320105540)

@clerk/backend NPM version =3.0.0, =0.2.9-canary.v20251211104600, =3.0.0-canary.v20251211104600, =2.0.0-canary.v20251211104600, =2.6.9-canary.v20251211104600, =0.0.1, =7.0.0-canary.v20251211104600, =2.0.0-canary.v20251211104600, =3.0.0-canary.v20251211104600, =1.0.0-canary.v20251211104600,...

GHSA-GJXX-92W9-8V8F Clerk: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host

Summary The clerkFrontendApiProxy function in @clerk/backend is vulnerable to Server-Side Request Forgery SSRF. An unauthenticated attacker can craft a request path that causes the proxy to send the application's Clerk-Secret-Key to an attacker-controlled server. Affected packages Only applicatio...

Server-side Request Forgery (SSRF)

Overview @clerk/backend is a Clerk Backend SDK - REST Client for Backend API & JWT verification utilities Affected versions of this package are vulnerable to Server-side Request Forgery SSRF via the clerkFrontendApiProxy function. An attacker can obtain secret keys by crafting a request path that...

Clerk: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host

Summary The clerkFrontendApiProxy function in @clerk/backend is vulnerable to Server-Side Request Forgery SSRF. An unauthenticated attacker can craft a request path that causes the proxy to send the application's Clerk-Secret-Key to an attacker-controlled server. Affected packages Only applicatio...

PT-2026-28602

Summary The clerkFrontendApiProxy function in @clerk/backend is vulnerable to Server-Side Request Forgery SSRF. An unauthenticated attacker can craft a request path that causes the proxy to send the application's Clerk-Secret-Key to an attacker-controlled server. Affected packages Only applicatio...

EUVD-2025-20865

Malicious code in bioql PyPI...

@unhook/cli (>=0.9.3, <=0.13.1) potentially affected by CVE-2025-53548 via @clerk/backend (>=2.0.0, <=2.1.0)

@clerk/backend NPM version =2.0.0, =0.9.3, =0.13.1 Source cves: CVE-2025-53548 Source advisory: OSV:GHSA-9MP4-77WG-RWX9...

CVE-2025-53548

CVE-2025-53548 concerns Clerk’s verifyWebhook() validation. Across connected documents, the issue is that the verifyWebhook() helper may accept improperly signed webhook events, enabling signature forgery. The vulnerability is mitigated by upgrading to @clerk/backend 2.4.0, which properly parses ...