EUVD-2026-38443
GHSA-55cm-p4ww-685g
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable with no auth needed; integrity impact omitted because header injection was not confirmed; availability is Low due to runtime errors.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3Blast Radius
ecosystem impact- 64 npm packages depend on hono (48 direct, 16 indirect)
Ecosystem-wide dependent count for version 4.12.12.
DescriptionCVE.org
Hono before 4.12.12 does not validate cookie names on the write path in the setCookie(), serialize(), and serializeSigned() functions, allowing invalid characters such as control characters (e.g. \r or \n) when an application passes a user-controlled cookie name. This can produce malformed Set-Cookie header values. In modern runtimes such as Node.js and Cloudflare Workers, such invalid header values are rejected and cause a runtime error before the response is sent, so header injection or response splitting could not be reproduced; the issue primarily affects correctness and robustness, resulting in runtime errors (availability) rather than confirmed header injection.
AnalysisAI
Missing cookie name validation on the write path in Hono's setCookie(), serialize(), and serializeSigned() functions allows user-controlled input containing CRLF control characters to produce malformed Set-Cookie headers. Affected are all Hono npm releases before 4.12.12. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the Hono application explicitly passes user-controlled (untrusted) input as the cookie name argument to setCookie(), serialize(), or serializeSigned(). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L) scores 6.9, reflecting network reachability with no authentication requirement and low availability impact - appropriately calibrated given that confirmed runtime behavior produces errors rather than data exposure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends an HTTP request to a Hono-based endpoint that reflects or accepts user input as a cookie name - for example, a session personalization feature that stores a user-supplied preference name as a cookie. By injecting a value containing \r\n (CRLF) characters in the cookie name field, the attacker causes setCookie() to generate a malformed Set-Cookie header. … |
| Remediation | Upgrade the Hono npm package to version 4.12.12 or later; this is the vendor-released patch confirmed by advisory GHSA-26pp-8wgv-hjvm and patch commit https://github.com/honojs/hono/commit/a586cd72e3f6122792e631ecf1817e5cabb803ec. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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