Improper Verification of Cryptographic Signature Affecting hono package, versions <4.11.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-HONO-14927373
- published14 Jan 2026
- disclosed13 Jan 2026
- creditDevansh Batham, calloc134
Introduced: 13 Jan 2026
CVE-2026-22818 (opens in a new tab)How to fix?
Upgrade hono to version 4.11.4 or higher.
Overview
hono is an Ultrafast web framework for the Edges
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature due to the JWT verification middleware fallback on unverified JWT header when alg field is not present. An attacker can gain unauthorized access or escalate privileges by crafting JWTs with manipulated alg header values and force the middleware to use unsafe symmetric algorithms for verification.
Note:
Users that configured their app without JWK/JWKS middleware or explicitly restrict allowed algorithms are not affected.