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CVE-2026-18174

@fastify/forwarded resolves client addresses from the X-Forwarded-For header. In versions before 3.0.2, when the header contains two or more comma separated entries, the parser trims only space characters and does not strip horizontal tabs, even though RFC 7230 defines optional whitespace as both space and tab. As a result, an entry padded with a tab keeps the literal tab in the resolved address string. Applications that make exact string match security decisions on the resolved client IP, such
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:3d41ba12ae785eaedf7bfd947fa22c63b89efbb181956801f238c207942e2269
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-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:91a65bb84bb8eda49b3e59fe5bfc1dccaaba0c8c82c2e348f292e1b1692ae358 · sha256:6b29127ad07edd38… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-184","description":"CWE-184: Incomplete List of Disallowed Inputs","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:91a65bb84bb8eda49b3e59fe5bfc1dccaaba0c8c82c2e348f292e1b1692ae358 · sha256:6b29127ad07edd38… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/@fastify/forwarded","product":"@fastify/forwarded","vendor":"@fastify/forwarded","versions":[{"lessThan":"3.0.2","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"3.0.2","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:91a65bb84bb8eda49b3e59fe5bfc1dccaaba0c8c82c2e348f292e1b1692ae358 · sha256:6b29127ad07edd38… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:91a65bb84bb8eda49b3e59fe5bfc1dccaaba0c8c82c2e348f292e1b1692ae358 · sha256:6b29127ad07edd38… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:91a65bb84bb8eda49b3e59fe5bfc1dccaaba0c8c82c2e348f292e1b1692ae358 · sha256:6b29127ad07edd38… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-184","description":"CWE-184: Incomplete List of Disallowed Inputs","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:91a65bb84bb8eda49b3e59fe5bfc1dccaaba0c8c82c2e348f292e1b1692ae358 · sha256:6b29127ad07edd38… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"url":"https://cna.openjsf.org/security-advisories.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:91a65bb84bb8eda49b3e59fe5bfc1dccaaba0c8c82c2e348f292e1b1692ae358 · sha256:6b29127ad07edd38… · /containers/cna/references/1
{"url":"https://github.com/fastify/forwarded/security/advisories/GHSA-2849-m2w7-xm8f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:91a65bb84bb8eda49b3e59fe5bfc1dccaaba0c8c82c2e348f292e1b1692ae358 · sha256:6b29127ad07edd38… · /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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