CVE-2026-6322: fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitte

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HIGH 7.5REMOTEUPGRADE

CVE-2026-6322 is a high-severity flaw (CVSS 7.5) affecting fast-uri. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 o

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-436, CWE-140
Published	2026-05-05
Last modified	2026-09-10

Publisher (CNA): openjs · Vendor: openjsf

Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-05 11:16 UTCPublished CVE record published
2026-09-10 13:20 UTCUpdated Record last modified

openjsf fast-uri UPGRADE

Affected: < 3.1.2

Fixed in: 3.1.2

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls fast-uri

2. UPGRADE to 3.1.2

npm install fast-uri@">=3.1.2"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-6322?

fast-uri: upgrade to 3.1.2. Exact commands for each OS are on this page.

Is CVE-2026-6322 being exploited?

CVE-2026-6322 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-6322 affect?

CVE-2026-6322 affects fast-uri. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-6322?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-75931 HIGH 7.5 UPGRADE fast-uri is a URI parser for Node.js
CVE-2026-76172 HIGH 7.5 UPGRADE fast-uri is a URI parser for Node.js
CVE-2026-75899 HIGH 7.5 UPGRADE fast-uri is a URI parser for Node.js
CVE-2026-75975 HIGH 7.5 UPGRADE fast-uri is a URI parser for Node.js
CVE-2026-84292 HIGH 7.5 UPGRADE fast-uri serializes the port component of a URI without validating it

References

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