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TI-2026-28392 Aliases CVE-2026-39410GHSA-r5rp-j6wh-rvv4

Hono has a non-breaking space prefix bypass in cookie name handling in getCookie()

Priority LOW 22CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00289 21st percentileScored 2026-11-07
Fix Fixed hono (honojs): 4.12.12hono (npm): 4.12.12

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
honojshonobefore 4.12.124.12.12Patch availableCNA
—hono (npm)before 4.12.124.12.12Patch availableGHSA-r5rp-j6wh-rvv4
  • hono Vendorhonojs Affected before 4.12.12 Fixed in 4.12.12 Patch available CNA
  • hono (npm) Vendor— Affected before 4.12.12 Fixed in 4.12.12 Patch available GHSA-r5rp-j6wh-rvv4

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:*up to 4.12.11Vulnerablehonojs
  • cpe:2.3:a:hono:hono:*:*:*:*:*:node.js:*:* Versions up to 4.12.11 Vulnerable ·honojs

Remediation

  • Fix · CNA hono (honojs) Fixed in 4.12.12
  • Fix · GHSA-r5rp-j6wh-rvv4 hono (npm) Fixed in 4.12.12 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39410
  2. 2026-10-03 Alias added: GHSA-r5rp-j6wh-rvv4

References

Advisory 3

Other 2

  • TI-2024-21741 Hono vulnerable to Restricted Directory Traversal in serveStatic with deno CVSS 3.1MEDIUM 5.3
  • TI-2024-32610 Hono vulnerable to bypass of CSRF Middleware by a request without Content-Type header. CVSS 3.1MEDIUM 5.9
  • TI-2024-29381 Hono CSRF middleware can be bypassed using crafted Content-Type header CVSS 3.1MEDIUM 5.0
  • TI-2026-23190 Hono: Arbitrary file access via serveStatic vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2026-22076 Hono is Vulnerable to Authentication Bypass by IP Spoofing in AWS Lambda ALB conninfo CVSS 3.1HIGH 8.2
  • TI-2026-18334 JWT algorithm confusion in Hono JWK Auth Middleware when JWK lacks "alg" (untrusted header.alg fallback) CVSS 3.1HIGH 8.2
See all 33 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences