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CVE-2026-59897

Hono is a Web application framework that provides support for any JavaScript runtime. From 4.3.3 before 4.12.27, the AWS API Gateway v1 adapter can drop a distinct repeated request header value because it de-duplicates values using a substring comparison instead of an exact match, so middleware or application logic that depends on the complete X-Forwarded-For chain, rate limiting, audit logging, or proxy-chain validation can receive incomplete data. This issue is fixed in version 4.12.27.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4cba7b4159e8aae6460e29e3672c5e20fdfc38f80b3e25aa8f89d487a92afe11
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"hono","vendor":"honojs","versions":[{"status":"affected","version":">= 4.3.3, < 4.12.27"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5baa03312e51ef406f0e27c8fd79716653d39f6a0123c451d109eb6a1775742f · sha256:e7cc3df666560dd7… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5baa03312e51ef406f0e27c8fd79716653d39f6a0123c451d109eb6a1775742f · sha256:e7cc3df666560dd7… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-348","description":"CWE-348: Use of Less Trusted Source","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5baa03312e51ef406f0e27c8fd79716653d39f6a0123c451d109eb6a1775742f · sha256:e7cc3df666560dd7… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/commit/aa921770d09bc35970362d5a2630a878f6d982fd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5baa03312e51ef406f0e27c8fd79716653d39f6a0123c451d109eb6a1775742f · sha256:e7cc3df666560dd7… · /containers/cna/references/1
{"name":"https://github.com/honojs/hono/releases/tag/v4.12.27","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/releases/tag/v4.12.27"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5baa03312e51ef406f0e27c8fd79716653d39f6a0123c451d109eb6a1775742f · sha256:e7cc3df666560dd7… · /containers/cna/references/2
{"name":"https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/honojs/hono/security/advisories/GHSA-xgm2-5f3f-mvvc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5baa03312e51ef406f0e27c8fd79716653d39f6a0123c451d109eb6a1775742f · sha256:e7cc3df666560dd7… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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