{"cve":"CVE-2026-6322","nvd":{"published":"2026-05-05T11:16:33.360","modified":"2026-09-10T13:20:29.023","status":"Modified","description":"fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization. A host that combined an allowed domain, an encoded at-sign, and a different domain was re-emitted with the at-sign as a raw userinfo separator, changing the URI's authority to the second domain. Applications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the input appeared to specify. Versions <= 3.1.1 are affected. Update to 3.1.2 or later.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-436","CWE-140"],"references":["https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fast-uri/security/advisories/GHSA-v39h-62p7-jpjc","https://access.redhat.com/errata/RHSA-2026:25271","https://access.redhat.com/errata/RHSA-2026:25273","https://access.redhat.com/errata/RHSA-2026:26225"],"products":["openjsf:fast-uri"],"source":"nvd","synced_at":"2026-10-19T22:33:55.586217763+00:00"},"epss":{"cve":"CVE-2026-6322","score":0.00512,"percentile":0.43677,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-v39h-62p7-jpjc","url":"https://osv.dev/vulnerability/GHSA-v39h-62p7-jpjc","summary":"fast-uri vulnerable to host confusion via percent-encoded authority delimiters","modified":"2026-09-10T03:50:47.650164671Z","packages":[{"ecosystem":"npm","name":"fast-uri","purl":"pkg:npm/fast-uri","ranges":[">=3.0.0 <3.1.2"],"fixed":["3.1.2"]},{"ecosystem":"npm","name":"fast-uri","purl":"pkg:npm/fast-uri","ranges":["<2.4.1"],"fixed":["2.4.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}