CVE-2026-6322
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
fast-urinpm | < 3.1.2 | 3.1.2 |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- cna.openjsf.org/security-advisories.htmlnvdVendor AdvisoryWEB
- github.com/advisories/GHSA-v39h-62p7-jpjcghsaADVISORY
- github.com/fastify/fast-uri/security/advisories/GHSA-v39h-62p7-jpjcnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-6322ghsaADVISORY
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