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Vulnerabilities

Vulnerability · CVE-2025-59139

Hono is a Web application framework that provides support for any JavaScript runtime.

Published Sep 12, 2025 · catalog updated Sep 12, 2025 · Hono is a Web

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-59139. EPSS is 0.45%. Act only if a listed version of Hono is a Web is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Hono is a Web).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.45%
Remediation
Version ranges on file
Affected products
vendor honojs hono < 4.9.7

Hono is a Web application framework that provides support for any JavaScript runtime. In versions prior to 4.9.7, a flaw in the middleware could allow bypassing the configured request body size limit when conflicting HTTP headers were present. The middleware previously prioritized the header even when a header was also included. According to the HTTP specification, must be ignored in such cases. This discrepancy could allow oversized request bodies to bypass the configured limit. Most standards-compliant runtimes and reverse proxies may reject such malformed requests with , so the practical im

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor honojs hono < 4.9.7< 4.9.7

How to fix CVE-2025-59139

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-59139. EPSS is 0.45%. Act only if a listed version of Hono is a Web is installed.

Which versions are affected?

Compare what you have installed with honojs hono < 4.9.7 < 4.9.7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.45%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 12, 2025 · EUVD

    Detected

    Hono is a Web application framework that provides support for any JavaScript runtime. In versions prior to 4.9.7, a flaw in the middleware could allow bypassing the configured request body size limit when conflicting HTTP headers were present. The middleware previously prioritized the header even when a header was also included. According to the HTTP specification, must be ignored in such cases. T

  2. Sep 12, 2025 · EUVD

    Updated

    Hono is a Web application framework that provides support for any JavaScript runtime. In versions prior to 4.9.7, a flaw in the middleware could allow bypassing the configured request body size limit when conflicting HTTP headers were present. The middleware previously prioritized the header even when a header was also included. According to the HTTP specification, must be ignored in such cases. T

Sources

  • CVE.orgVulnerability recordCVE-2025-59139

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-59139

    30-day exploitation probability 0.45%

    first.org
  • EUVDVulnerability recordEUVD-2025-29042

    Hono is a Web application framework that provides support for any JavaScript runtime. In versions prior to 4.9.7, a flaw in the middleware could allow bypassing the configured request body size limit when conflicting HTTP headers were present. The middleware previously prioritize

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026