CVE Explorer

CVE-2026-16221

Impact: fast-uri versions from 2.3.1 through 4.1.0 (including the 3.x line up to 3.1.3 and the 2.x line up to 2.4.2) do not treat a literal backslash character (U+005C) as an authority delimiter. Node's native WHATWG URL parser, used by fetch, undici, and Node's http and https clients, normalizes the backslash to a forward slash for special schemes such as http, https, ws, wss, ftp, and file. As a result, the two parsers extract different hosts from the same input string. Applications that use f

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:df0f558b24dfe5b931c1a21bda3a963b90d6456930c4c20db291c4eff45e80f6

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"defaultStatus":"unaffected","packageURL":"pkg:npm/fast-uri","product":"fast-uri","vendor":"fast-uri","versions":[{"lessThan":"2.4.3","status":"affected","version":"2.3.1","versionType":"semver"},{"status":"unaffected","version":"2.4.3","versionType":"semver"},{"lessThan":"3.1.4","status":"affected","version":"3.0.0","versionType":"semver"},{"status":"unaffected","version":"3.1.4","versionType":"semver"},{"lessThan":"4.1.1","status":"affected","version":"4.0.0","versionType":"semver"},{"status":"unaffected","version":"4.1.1","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:9c3fd7c6912ca3e9c0f228e53998fdfa93cbdfbac20ebf36818be063ea49e2d1 · sha256:260ca23db6fa8992… · /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:v2:9c3fd7c6912ca3e9c0f228e53998fdfa93cbdfbac20ebf36818be063ea49e2d1 · sha256:260ca23db6fa8992… · /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:v2:9c3fd7c6912ca3e9c0f228e53998fdfa93cbdfbac20ebf36818be063ea49e2d1 · sha256:260ca23db6fa8992… · /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:v2:9c3fd7c6912ca3e9c0f228e53998fdfa93cbdfbac20ebf36818be063ea49e2d1 · sha256:260ca23db6fa8992… · /containers/cna/references/1

{"url":"https://github.com/fastify/fast-uri/security/advisories/GHSA-v2hh-gcrm-f6hx"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:9c3fd7c6912ca3e9c0f228e53998fdfa93cbdfbac20ebf36818be063ea49e2d1 · sha256:260ca23db6fa8992… · /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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