8.2

CVE-2026-22818: hono

CVSS: 8.2v3.1HighAnalyzed
AliasesCGA-25p2-473w-2vh7CGA-c4v2-6w22-m985GHSA-3vhc-576x-3qv4
Published 13-01-2026Last modified 15-01-2026
Open JSON

Vulnerability summary

CVE-2026-22818 is a high (CVSS 8.2) vulnerability in hono. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.8% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-MVCJ-PC68-76CM

Timeline

  1. 13-01-2026
    PublishedVulnerability first disclosed.
  2. 15-01-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

0.00 pp

From 0.14% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.14%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard9 products
  • honoAll versions (No fix recorded)
  • hono-adapter-mqttAll versions (No fix recorded)
  • hono-cliAll versions (No fix recorded)
  • hono-compatAll versions (No fix recorded)
  • hono-service-authAll versions (No fix recorded)
Hono1 product
Honojs1 product
Npm1 product
  • hono< 4.11.4
Wolfi1 product
  • langfuse-3-worker< 3.146.0-r1

5 vendors · 13 products

References

5 links