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Hono EUVDEUVD-2026-38443

| CVE-2026-56762 MEDIUM
HTTP Response Splitting (CWE-113)
2026-06-23 VulnCheck GHSA-55cm-p4ww-685g
Code Injection Node.js Hono
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
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
vuln.today AI
5.3 MEDIUM

Network-reachable with no auth needed; integrity impact omitted because header injection was not confirmed; availability is Low due to runtime errors.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Jun 23, 2026 - 14:17 EUVD
Source Code Evidence Fetched
Jun 23, 2026 - 13:12 vuln.today
Analysis Generated
Jun 23, 2026 - 13:12 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 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

Access
Send HTTP request with CRLF-embedded cookie name
Delivery
Application passes name to setCookie() without sanitization
Exploit
Hono serializes malformed Set-Cookie header
Execution
Runtime rejects invalid header value
Persist
Application throws uncaught runtime error
Impact
Response fails, endpoint becomes unavailable
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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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EUVD-2026-38443 vulnerability details – vuln.today
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