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VulnerabilityPublished Updated

CVE-2026-6322: fast-uri · Interpretation Conflict

Affects fast-uriSource GCVE Database

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Not known to be exploited · CVSS 7.5 High · fixed in 3.1.2 : patch fast-uri soon.

Data as of 12 Nov 2026, 00:38 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.

Sources agree

CVSS scores by source
CNA (openjs)CVSS 3.17.5
ADP (redhat-SADP)CVSS 3.17.5
Patch
Available – fixed in 3.1.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
fast-uri fast-uriAffected
  • =0
  • <=3.1.1
Fixed in–

AI-suggested

Update fast-uri to version 3.1.2 or later where this vulnerability is fixed. Applications should ensure they use the patched version to prevent bypass of host allowlist checks and related security controls. No additional mitigation is required if the update is applied.

Description

CVE-2026-6322 is a vulnerability in the fast-uri library versions up to 3.1.1 where percent-encoded authority delimiters in URIs are improperly decoded and re-emitted. This causes the URI's authority component to be interpreted incorrectly, allowing attackers to bypass host allowlist checks, redirect validation, or outbound request routing by steering applications to a different domain than intended. The issue is fixed in version 3.1.2 and later.

References

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