VDB-340957 · CVE-2026-22818 · GHSA-3vhc-576x-3qv4

honojs hono up to 4.11.3 JWK/JWKS signature verification

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.2	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in honojs hono up to 4.11.3. Affected by this issue is some unknown functionality of the component JWK/JWKS. This manipulation causes signature verification. This vulnerability is tracked as CVE-2026-22818. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in honojs hono up to 4.11.3. Affected by this vulnerability is an unknown functionality of the component JWK/JWKS. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-22818 since 01/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

Upgrading to version 4.11.4 eliminates this vulnerability. Applying the patch 190f6e28e2ca85ce3d1f2f54db1310f5f3eab134 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-0328). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

IBM App Connect Enterprise

Productinfo

Vendor

honojs

Name

hono

Version

License

open-source

Website

Product: https://github.com/honojs/hono/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔒

CNA Base Score: 8.2
CNA Vector (GitHub_M): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Signature verification
CWE: CWE-347 / CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: hono 4.11.4
Patch: 190f6e28e2ca85ce3d1f2f54db1310f5f3eab134

Timelineinfo

01/09/2026 CVE reserved
01/14/2026 +5 days Advisory disclosed
01/14/2026 +0 days VulDB entry created
02/06/2026 +23 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-3vhc-576x-3qv4
Status: Confirmed

CVE: CVE-2026-22818 (🔒)
GCVE (CVE): GCVE-0-2026-22818
GCVE (VulDB): GCVE-100-340957
CERT Bund: WID-SEC-2026-0328 - IBM App Connect Enterprise Certified Container: Mehrere Schwachstellen

Entryinfo

Created: 01/14/2026 08:19
Updated: 02/06/2026 12:59
Changes: 01/14/2026 08:19 (66), 01/21/2026 05:37 (11), 02/06/2026 12:59 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.