CVE-2026-73418
High · CVSS 7.5Published 2026-08-12
CVSS
7.5
High
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-73418?
NextAuth.js provides authentication for Next.js. Prior to @auth/core 0.41.3 and next-auth 4.24.15 and 5.0.0-beta.32, the exported getToken() helper in the next-auth/jwt and @auth/core/jwt modules can throw an uncaught exception when it reads a malformed Authorization: Bearer header. When no session cookie is present, getToken() URL-decodes the bearer value before validating it, and malformed percent encoding causes decodeURIComponent() to throw instead of treating the token as invalid. Because getToken() is commonly called in API routes, middleware, and server-side request handlers, a single unauthenticated request can trigger an unhandled exception in code paths that authenticate requests, causing a per-request denial of service without exposing tokens, sessions, or other data and without bypassing authentication. This issue is fixed in @auth/core 0.41.3 and next-auth 4.24.15 and 5.0.0-beta.32.
CVSS Score Explained
CVSS 7.5 is High severity. Exploitation is likely straightforward and the impact is significant — data loss, privilege escalation, or remote code execution are common outcomes. Patch as soon as possible.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://github.com/nextauthjs/next-auth/commit/5bca2399a79ba8d116ca5179b4b1ebcd152e7f05
- ›https://github.com/nextauthjs/next-auth/commit/e707770f00c52b3479e43422b0200b059149ed53
- ›https://github.com/nextauthjs/next-auth/pull/13469
- PATCHhttps://github.com/nextauthjs/next-auth/releases/tag/%40auth%2Fcore%400.41.3
- PATCHhttps://github.com/nextauthjs/next-auth/releases/tag/next-auth%404.24.15
- PATCHhttps://github.com/nextauthjs/next-auth/releases/tag/next-auth%405.0.0-beta.32
- ›https://github.com/nextauthjs/next-auth/security/advisories/GHSA-xmf8-cvqr-rfgj
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