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Vulnerabilities

Vulnerability · CVE-2026-6322

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

Published May 5, 2026 · catalog updated Sep 10, 2026 · fast-uri normalize() decoded percent-encoded

Check if you run it

No confirmed exploitation is on record for CVE-2026-6322. EPSS is 0.68%. Act only if a listed version of fast-uri normalize() decoded percent-encoded is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (fast-uri normalize() decoded percent-encoded).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.68%
Remediation
Version ranges on file
Affected products
cpe openjsf/fast-uri · stated 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 <= 3.1.1 are affected. Update to 3.1.2 or later.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe openjsf/fast-uriversion unspecified
  • stated fast-uri<= 3.1.1

How to fix CVE-2026-6322

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-6322. EPSS is 0.68%. Act only if a listed version of fast-uri normalize() decoded percent-encoded is installed.

Which versions are affected?

Compare what you have installed with <= 3.1.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-140; CWE-436. EPSS 0.68%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 5, 2026 · NIST NVD

    Detected

    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 befor

  2. Sep 10, 2026 · NIST NVD

    Updated

    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 befor

Sources

  • CVE.orgVulnerability recordCVE-2026-6322

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-6322

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-2026-6322

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.