Skip to main content
VulnerabilityPublished

CVE-2026-54288: honojs hono · Insufficient Verification of Data Authenticity

Affects honojs honoSource CVE Database V5

0
Compare

Not known to be exploited · CVSS 6.5 Medium : upgrade to 4.12.25 when convenient.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.12.25
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade honojs hono to 4.12.25.

Affected software

ProductAffectedFixed in
honojshonoAffected
  • <4.12.25
Fixed in
  • 4.12.25
npmhonopkg:npm/honoOther threatsAffected
  • <4.12.25
Fixed in
  • 4.12.25

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available in hono version 4.12.25 that fixes this vulnerability by properly verifying the actual payload size rather than relying solely on the Content-Length header. Users should upgrade to version 4.12.25 or later. Since this is a cloud-hosted service environment (AWS Lambda), the vendor manages remediation for the cloud-hosted service; however, for self-hosted deployments, upgrading is required. No additional mitigations are specified.

Description

Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.25, the Body Limit Middleware trusts the request's Content-Length header to decide whether a body is within the limit. On AWS Lambda (API Gateway v1/v2, ALB, VPC Lattice, and Lambda@Edge) the body is delivered fully buffered and the adapter builds the request with the client-declared Content-Length, which need not match the actual payload. A client can declare a tiny Content-Length while sending a much larger body, slipping past the limit. This vulnerability is fixed in 4.12.25.

References

Community reviews

Loading reviews…