CVE-2026-73418 | BDVDB-2026-358545 Detail
nextauthjsnext-auth
Description#
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.
Impact#
Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: network.
Weaknesses#
References#
- https://github.com/nextauthjs/next-auth/security/advisories/GHSA-xmf8-cvqr-rfgj
- https://github.com/nextauthjs/next-auth/pull/13469
- https://github.com/nextauthjs/next-auth/commit/5bca2399a79ba8d116ca5179b4b1ebcd152e7f05
- https://github.com/nextauthjs/next-auth/commit/e707770f00c52b3479e43422b0200b059149ed53
- https://github.com/nextauthjs/next-auth/releases/tag/%40auth%2Fcore%400.41.3
- https://github.com/nextauthjs/next-auth/releases/tag/next-auth%404.24.15
- https://github.com/nextauthjs/next-auth/releases/tag/next-auth%405.0.0-beta.32
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.