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CVE-2026-56762

MEDIUM
5.3
CVSS 3.1
Description
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.

Metadata

CVE ID
CVE-2026-56762
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-06-22 21:55 UTC
Published
2026-06-23 12:13 UTC
Last updated
2026-06-23 13:09 UTC
Primary CWE
CWE-113
Improper Neutralization of CRLF Sequences in HTTP Headers ('…
Vendor / Product
Hono / Hono
Sources
cve.org  ·  NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
Hono Hono — 0 < 4.12.12, 4.12.12
Weakness (CWE)
CWESourceDescription
CWE-113 cna Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CVSS scores (2)
ScoreSeverityVersionSourceVector
6.9 MEDIUM 4.0 cna 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
5.3 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References (2)
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