Is there a public exploit for CVE-2026-22818?

No public exploit for CVE-2026-22818 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-22818?

CVE-2026-22818 scores CVSS 8.2 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.14%.

What does CVE-2026-22818 affect?

CVE-2026-22818 affects honojs hono.

8.2 High

Hono is a Web application framework that provides support for any JavaScript runtime.

CVE-2026-22818

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.

Assessment

CVSS: 8.2 (v3.1)
Severity: High
EPSS: 0.14% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 13 January 2026
Last updated: 17 June 2026
Affected: honojs · hono
Weakness: CWE-347
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

At the source

References

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