7.5

CVE-2026-6322: fast-uri vulnerable to host confusion via percent-encoded authority delimiters

Modified
AliasesUBUNTU-CVE-2026-6322DEBIAN-CVE-2026-6322CGA-9849-cc8h-m7cm
Published 05-05-2026Last modified 10-09-2026

Vulnerability summary

CVE-2026-6322 is a high (CVSS 7.5) Interpretation Conflict vulnerability in fast-uri. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 43.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.51%
0%100%
Low · -0.16 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 1
RHSA-2026:34160RHSA-2026:37385RHSA-2026:42078RHSA-2026:60855CGA-5VR9-C8QR-FQVG

Timeline

  1. 05-05-2026
    PublishedVulnerability first disclosed.
  2. 10-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

Decrease -0.16 pp

From 0.68% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard79 products
  • airflow-2All versions (No fix recorded)
  • airflow-core-2All versions (No fix recorded)
  • arangodb-3.12< 3.12.7.2-r5
  • argo-workflows-ui-3.6< 3.6.19-r6
  • commercial-gitlab-rails-ee-19.1< 19.1.7-r3
Wolfi9 products
  • langfuse-3< 3.174.1-r0
  • langfuse-3-worker< 3.174.1-r0
  • opensearch-dashboards-3< 3.6.0-r4
  • opensearch-dashboards-3-dashboards-observability< 3.6.0-r4
  • prism< 5.15.10-r1
Debian1 product
  • node-ajvAll versions (No fix recorded) | < 8.20.0~ds+~cs6.1.3-1
Fast-uri1 product
Npm1 product
  • fast-uri≥ 3.0.0, < 3.1.2 | < 2.4.1
Openjsf1 product
Ubuntu1 product
  • node-ajvAll versions (No fix recorded)

7 vendors · 93 products

References

55 links
Show all 55 references