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CVE-2026-27700

Hono is a Web application framework that provides support for any JavaScript runtime. In versions 4.12.0 and 4.12.1, when using the AWS Lambda adapter (`hono/aws-lambda`) behind an Application Load Balancer (ALB), the `getConnInfo()` function incorrectly selected the first value from the `X-Forwarded-For` header. Because AWS ALB appends the real client IP address to the end of the `X-Forwarded-For` header, the first value can be attacker-controlled. This could allow IP-based access control mecha
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2b9e622936ffb8e6dd770429577cee0582fc80f561ad4a3b52283dfb6cf225e0
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:76bc22a4e214ce491a6ca1456a7eb45fdd2c8d336ec83317ef62bd586af607e9 · sha256:47451f9fa3b143f3… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:76bc22a4e214ce491a6ca1456a7eb45fdd2c8d336ec83317ef62bd586af607e9 · sha256:47451f9fa3b143f3… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"hono","vendor":"honojs","versions":[{"status":"affected","version":">= 4.12.0, < 4.12.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:76bc22a4e214ce491a6ca1456a7eb45fdd2c8d336ec83317ef62bd586af607e9 · sha256:47451f9fa3b143f3… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:76bc22a4e214ce491a6ca1456a7eb45fdd2c8d336ec83317ef62bd586af607e9 · sha256:47451f9fa3b143f3… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:76bc22a4e214ce491a6ca1456a7eb45fdd2c8d336ec83317ef62bd586af607e9 · sha256:47451f9fa3b143f3… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:76bc22a4e214ce491a6ca1456a7eb45fdd2c8d336ec83317ef62bd586af607e9 · sha256:47451f9fa3b143f3… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/commit/41adbf56e252c04611f8972364ac0887ae07a4c7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:76bc22a4e214ce491a6ca1456a7eb45fdd2c8d336ec83317ef62bd586af607e9 · sha256:47451f9fa3b143f3… · /containers/cna/references/1
{"name":"https://github.com/honojs/hono/releases/tag/v4.12.2","tags":["x_refsource_MISC"],"url":"https://github.com/honojs/hono/releases/tag/v4.12.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:76bc22a4e214ce491a6ca1456a7eb45fdd2c8d336ec83317ef62bd586af607e9 · sha256:47451f9fa3b143f3… · /containers/cna/references/2
{"name":"https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/honojs/hono/security/advisories/GHSA-xh87-mx6m-69f3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:76bc22a4e214ce491a6ca1456a7eb45fdd2c8d336ec83317ef62bd586af607e9 · sha256:47451f9fa3b143f3… · /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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