CVE-2026-84394

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 87% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — Patch released this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the host with error undefined, while Node's URL and the HTTP clients built on it resolve the same string to a different host. An application that reads the parsed host to make a host decision, such as an SSRF denylist, a redirect allowlist, or proxy routing, and then passes the original URL to an HTTP client evaluates its policy against a string that is not the host the request reaches. The same host is carried through normalize, equal, and resolve. This affects fast-uri versions 2.4.5, 3.1.6, and 4.1.3, and is fixed in 2.4.6, 3.1.7, and 4.1.4, where parse() reports a malformed host for any host that contains a bracket but is not a valid IPv6 literal.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 4, 2026

Advisory Details (2)

Auto-updated Sep 2, 2026
Patch available. Sources: github.
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html
github Patch Available

fast-uri vulnerable to host confusion via an unclosed bracket in the URI authority · Advisory · fastify/fast-uri · GitHub

https://github.com/fastify/fast-uri/security/advisories/GHSA-58mr-gqgx-xq4g

Vendor Advisories for CVE-2026-84394(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatansible-automation-platform/automation-portal:17887835912026-09-08redhat
redhatgrafana13-2-main-13.2.1-0.2.hum12026-09-08redhat
redhatgrafana13-1-main-13.1.3-0.6.hum12026-09-08redhat
redhatansible-automation-platform/automation-portal:17887757482026-09-08redhat
redhatgrafana12-4-main-12.4.9-0.6.hum12026-09-04redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-ajv8.12.0~ds+~2.1.1-5 ... 8.20.0~ds+~cs7.1.5-1 (14 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-ajv8.12.0~ds+~2.1.1-5 ... 8.20.0~ds+~cs7.1.4-1 (13 versions)8.20.0~ds+~cs7.1.5-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 23× in last 7d / 31× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-11 20:59 UTCEG score recompute
  2. 2026-09-11 20:59 UTCVendor advisory
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 09:48 UTCEG score recompute
  6. 2026-09-11 09:48 UTCVendor advisory
  7. 2026-09-10 22:37 UTCVendor advisory
  8. 2026-09-10 11:26 UTCEG score recompute
  9. 2026-09-10 11:26 UTCVendor advisory
  10. 2026-09-09 23:30 UTCVendor advisory
  11. 2026-09-09 10:31 UTCVendor advisory
  12. 2026-09-08 23:10 UTCEG score recompute
  13. 2026-09-08 23:10 UTCVendor advisory
  14. 2026-09-08 22:01 UTCEPSS rescore
  15. 2026-09-08 10:12 UTCVendor advisory
  16. 2026-09-07 22:57 UTCEG score recompute
  17. 2026-09-07 22:57 UTCVendor advisory
  18. 2026-09-07 11:45 UTCVendor advisory
  19. 2026-09-07 00:29 UTCEG score recompute
  20. 2026-09-07 00:29 UTCVendor advisory
  21. 2026-09-06 13:48 UTCEPSS rescore
  22. 2026-09-06 02:07 UTCEG score recompute
  23. 2026-09-05 15:31 UTCEPSS rescore
  24. 2026-09-04 16:30 UTCEG score recompute
  25. 2026-09-04 05:35 UTCEG score recompute
Show 6 more
  1. 2026-09-04 05:07 UTCEPSS rescore
  2. 2026-09-03 14:30 UTCEG score recompute
  3. 2026-09-03 13:25 UTCEG score recompute
  4. 2026-09-03 05:29 UTCEG score recompute
  5. 2026-09-02 20:31 UTCEG score recompute
  6. 2026-09-02 20:30 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-84394?
CVE-2026-84394 is a high vulnerability published on September 2, 2026. fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error. A host that starts with an opening bracket but does not end with a closing bracket is neither validated as an IP literal nor canonicalized as a domain name, so parse() returns it as the…
When was CVE-2026-84394 disclosed?
CVE-2026-84394 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84394 actively exploited?
CVE-2026-84394 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.4% of all scored CVEs.
What is the CVSS score of CVE-2026-84394?
CVE-2026-84394 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-84394?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84394, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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