CVE-2026-39410

MEDIUM

4.8

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.12, a discrepancy between browser cookie parsing and parse() handling allows cookie prefix protections to be bypassed. Cookie names that are treated as distinct by the browser may be normalized to the same key by parse(), allowing attacker-controlled cookies to override legitimate ones. This vulnerability is fixed in 4.12.12.

CVE Details

CVSS v3.1 Score4.8

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published4/8/2026

Last Modified4/8/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-20

References

https://github.com/honojs/hono/commit/cc067c85592415cb1880ad3c61ed923472452ec0(security-advisories@github.com)

https://github.com/honojs/hono/releases/tag/v4.12.12(security-advisories@github.com)

https://github.com/honojs/hono/security/advisories/GHSA-r5rp-j6wh-rvv4(security-advisories@github.com)

IOC Correlations

No correlations recorded

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