CVE-2026-22818
HIGH
GHSA-3vhc-576x-3qv4
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Lifecycle Timeline
3Description
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.11.4, there is a flaw in Hono’s JWK/JWKS JWT verification middleware allowed the algorithm specified in the JWT header to influence signature verification when the selected JWK did not explicitly define an algorithm. This could enable JWT algorithm confusion and, in certain configurations, allow forged tokens to be accepted. The JWK/JWKS JWT verification middleware has been updated to require an explicit allowlist of asymmetric algorithms when verifying tokens. The middleware no longer derives the verification algorithm from untrusted JWT header values. This vulnerability is fixed in 4.11.4.
Analysis
Hono versions before 4.11.4 allow JWT algorithm confusion attacks through improper algorithm validation in the JWK/JWKS verification middleware, enabling attackers to forge valid tokens when the selected JWK lacks an explicit algorithm definition. An unauthenticated remote attacker can exploit this to bypass JWT signature verification and gain unauthorized access to affected applications. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.
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External POC / Exploit Code
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