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CVE-2026-18248

@fastify/aws-lambda version 6.4.0 decorates each Fastify request with request.awsLambda.event and request.awsLambda.context, values that applications are documented to use for authorization decisions such as reading API Gateway authorizer claims. In the default configuration, the getter that populates this decoration reads the client-controlled x-apigateway-event and x-apigateway-context HTTP headers before falling back to the trusted internal request token, and those reserved headers are not st
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8ece1ac8e8a9b669175cf24e660c53cc3809d27ea2d691de2402ab7c808ac31d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/@fastify/aws-lambda","product":"@fastify/aws-lambda","vendor":"@fastify/aws-lambda","versions":[{"lessThan":"6.4.1","status":"affected","version":"6.4.0","versionType":"semver"},{"status":"unaffected","version":"6.4.1","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5831bf87d14dd88a8beac6e10ccc8d41c1ae3507e7fae4dc0dfa9c44495c4691 · sha256:b0c9b06f173cb75d… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5831bf87d14dd88a8beac6e10ccc8d41c1ae3507e7fae4dc0dfa9c44495c4691 · sha256:b0c9b06f173cb75d… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5831bf87d14dd88a8beac6e10ccc8d41c1ae3507e7fae4dc0dfa9c44495c4691 · sha256:b0c9b06f173cb75d… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"url":"https://cna.openjsf.org/security-advisories.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5831bf87d14dd88a8beac6e10ccc8d41c1ae3507e7fae4dc0dfa9c44495c4691 · sha256:b0c9b06f173cb75d… · /containers/cna/references/1
{"url":"https://github.com/fastify/aws-lambda-fastify/security/advisories/GHSA-m93c-jj3f-68ph"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5831bf87d14dd88a8beac6e10ccc8d41c1ae3507e7fae4dc0dfa9c44495c4691 · sha256:b0c9b06f173cb75d… · /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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