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CVE-2026-18446

fast-uri before 4.1.2, 3.1.5, and 2.4.4 requires a literal double forward slash to recognize a URI authority, so a reference that uses a backslash based introducer in place of it (backslash backslash, forward slash backslash, or backslash forward slash) is parsed with no authority and folds into the path. Node's native WHATWG URL parser instead treats a backslash as interchangeable with a forward slash for special schemes, so the two parsers extract different hosts from the same input. Applicati
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a5f2dc64e4cbef3b976ec062c253834f81249aa34b74a22314f85fff5c607d77
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/fast-uri","product":"fast-uri","vendor":"fast-uri","versions":[{"lessThan":"4.1.2","status":"affected","version":"4.0.0","versionType":"semver"},{"status":"unaffected","version":"4.1.2","versionType":"semver"},{"lessThan":"3.1.5","status":"affected","version":"3.0.0","versionType":"semver"},{"status":"unaffected","version":"3.1.5","versionType":"semver"},{"lessThan":"2.4.4","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"2.4.4","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b88c0eb15d1d6638175e51888ce7eb4f0231ef5009f3a0348ce8d54a527c2057 · sha256:c18ac1b1f5fb8918… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b88c0eb15d1d6638175e51888ce7eb4f0231ef5009f3a0348ce8d54a527c2057 · sha256:c18ac1b1f5fb8918… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-436","description":"CWE-436: Interpretation Conflict","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b88c0eb15d1d6638175e51888ce7eb4f0231ef5009f3a0348ce8d54a527c2057 · sha256:c18ac1b1f5fb8918… · /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:b88c0eb15d1d6638175e51888ce7eb4f0231ef5009f3a0348ce8d54a527c2057 · sha256:c18ac1b1f5fb8918… · /containers/cna/references/1
{"url":"https://github.com/fastify/fast-uri/security/advisories/GHSA-7p8r-x3mc-p8w7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b88c0eb15d1d6638175e51888ce7eb4f0231ef5009f3a0348ce8d54a527c2057 · sha256:c18ac1b1f5fb8918… · /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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