SB2026072462 - Multiple vulnerabilities in hono

Description

This security bulletin contains information about 2 vulnerabilities.

1) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2026-22818)

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to bypass authentication or authorization.

The vulnerability exists due to improper verification of cryptographic signature in the JWK/JWKS JWT verification middleware when processing JWTs with a selected JWK that lacks an alg value. A remote attacker can supply a crafted JWT with an attacker-controlled header alg value to bypass authentication or authorization.

Exploitation may allow forged tokens with attacker-controlled claims to be accepted in affected configurations.

2) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2026-22817)

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to forge JWTs and bypass authentication or authorization.

The vulnerability exists due to improper verification of cryptographic signature in the JWK/JWKS JWT verification middleware when processing JWTs with a JWK that does not explicitly specify an algorithm. A remote attacker can supply a crafted token with an attacker-controlled alg header value to forge JWTs and bypass authentication or authorization.

The issue affects configurations that use JWK or JWKS-based JWT verification and rely on the resulting claims for authorization decisions.

Remediation

Install update from vendor's website.

References

• https://github.com/honojs/hono/security/advisories/GHSA-3vhc-576x-3qv4
• https://github.com/honojs/hono/security/advisories/GHSA-f67f-6cw9-8mq4