CVE-2026-54289 json
Hono: Lambda@Edge adapter keeps only the last value of a repeated request header, dropping the rest
published 2026-06-16 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-38330 , GHSA-wgpf-jwqj-8h8p
- cvss
- 4.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 7%
- public exploits
- 0
- none known
Summary
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, on AWS Lambda@Edge, CloudFront delivers a request header that appears more than once as several separate entries. The adapter writes each value with Headers.set instead of Headers.append, so every value overwrites the previous one and only the last reaches the application. Repeated request headers such as X-Forwarded-For, Forwarded, and Via are silently truncated to a single value. Request middleware sees only the last value of a repeated header instead of the full chain. For applications that base access control on the X-Forwarded-For chain, this can weaken or alter that decision; for auditing, hop history is lost. This vulnerability is fixed in 4.12.25.
Patch / fix
- npm hono 4.12.25
- hono hono 4.12.25
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/honojs/hono/security/advisories/GHSA-wgpf-jwqj-8h8p referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | hono | <4.12.25 |
4.12.25 |
Affected products
- honojs hono
Classification
- Weakness
-
- CWE-348 Use of Less Trusted Source
References
-
github.com
/honojs/hono/security/advisories/GHSA-wgpf-jwqj-8h8p
exploit, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-54289
advisory
-
github.com
/honojs/hono
package
Sources
- CVE List CVE-2026-54289
- GitHub Advisory GHSA-wgpf-jwqj-8h8p
- NVD CVE-2026-54289
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.