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Vulnerability details: VCID-xymw-92x9-63fb
Vulnerability ID VCID-xymw-92x9-63fb
Aliases CVE-2026-22818
GHSA-3vhc-576x-3qv4
Summary 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.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-347 Improper Verification of Cryptographic Signature
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.0002 https://api.first.org/data/v1/epss?cve=CVE-2026-22818
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-3vhc-576x-3qv4
cvssv3.1 8.2 https://github.com/honojs/hono
generic_textual HIGH https://github.com/honojs/hono
cvssv3.1 8.2 https://github.com/honojs/hono/commit/190f6e28e2ca85ce3d1f2f54db1310f5f3eab134
generic_textual HIGH https://github.com/honojs/hono/commit/190f6e28e2ca85ce3d1f2f54db1310f5f3eab134
ssvc Track https://github.com/honojs/hono/commit/190f6e28e2ca85ce3d1f2f54db1310f5f3eab134
cvssv3.1 8.2 https://github.com/honojs/hono/security/advisories/GHSA-3vhc-576x-3qv4
cvssv3.1_qr HIGH https://github.com/honojs/hono/security/advisories/GHSA-3vhc-576x-3qv4
generic_textual HIGH https://github.com/honojs/hono/security/advisories/GHSA-3vhc-576x-3qv4
ssvc Track https://github.com/honojs/hono/security/advisories/GHSA-3vhc-576x-3qv4
cvssv3.1 8.2 https://nvd.nist.gov/vuln/detail/CVE-2026-22818
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-22818
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-22818
https://github.com/honojs/hono
190f6e28e2ca85ce3d1f2f54db1310f5f3eab134 https://github.com/honojs/hono/commit/190f6e28e2ca85ce3d1f2f54db1310f5f3eab134
CVE-2026-22818 https://nvd.nist.gov/vuln/detail/CVE-2026-22818
GHSA-3vhc-576x-3qv4 https://github.com/advisories/GHSA-3vhc-576x-3qv4
GHSA-3vhc-576x-3qv4 https://github.com/honojs/hono/security/advisories/GHSA-3vhc-576x-3qv4
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://github.com/honojs/hono
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://github.com/honojs/hono/commit/190f6e28e2ca85ce3d1f2f54db1310f5f3eab134
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-15T15:29:32Z/ Found at https://github.com/honojs/hono/commit/190f6e28e2ca85ce3d1f2f54db1310f5f3eab134
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://github.com/honojs/hono/security/advisories/GHSA-3vhc-576x-3qv4
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-01-15T15:29:32Z/ Found at https://github.com/honojs/hono/security/advisories/GHSA-3vhc-576x-3qv4
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-22818
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.05888
EPSS Score 0.0002
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:53:00.942110+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/22xxx/CVE-2026-22818.json 38.6.0