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CVE-2026-6322

high

fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization.

Vendor / product: Openjsf — fast-uri

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

CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Severity source: NVD CVSS v3.1 (ce714d77-add3-4f53-aff5-83d477b104bb)
Timeline (UTC)
Published: 2026-05-05 11:16
Modified: 2026-11-11 23:10
NVD status: Modified
Last synced 3 hours ago
Verified against the source API 2026-11-11 23:13 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

openjsf / fast-uri <3.1.2

Weakness classification (CWE)

CWE-436 CWE-140

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://cna.openjsf.org/security-advisories.html
Vendor advisory: https://github.com/fastify/fast-uri/security/advisories/GHSA-v39h-62p7-jpjc

References

Data sources

NVD CVE API 2.0 — fetched 2026-11-11 23:13 UTC · record ↗

Learn the basics

Understanding CVEs and CVSS Scores

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CVE-2026-6321CVE-2026-84292CVE-2026-84394