fast-uri vulnerable to host confusion via an unclosed bracket in the URI authority
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Partial Red Hat: 29 fixed, 16 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| fast-uri | fast-uri | 2.4.5 to before 2.4.6; 3.1.6 to before 3.1.7; 4.1.3 to before 4.1.4 | 2.4.6, 3.1.7, 4.1.4 | Patch available | CNA |
| — | fast-uri (npm) | 2.4.5 to before 2.4.6 | 2.4.6 | Patch available | GHSA-58mr-gqgx-xq4g |
| — | fast-uri (npm) | 3.1.6 to before 3.1.7 | 3.1.7 | Patch available | GHSA-58mr-gqgx-xq4g |
| — | fast-uri (npm) | 4.1.3 to before 4.1.4 | 4.1.4 | Patch available | GHSA-58mr-gqgx-xq4g |
- fast-uri Vendorfast-uri Affected 2.4.5 to before 2.4.6; 3.1.6 to before 3.1.7; 4.1.3 to before 4.1.4 Fixed in 2.4.6, 3.1.7, 4.1.4 Patch available CNA
- fast-uri (npm) Vendor— Affected 2.4.5 to before 2.4.6 Fixed in 2.4.6 Patch available GHSA-58mr-gqgx-xq4g
- fast-uri (npm) Vendor— Affected 3.1.6 to before 3.1.7 Fixed in 3.1.7 Patch available GHSA-58mr-gqgx-xq4g
- fast-uri (npm) Vendor— Affected 4.1.3 to before 4.1.4 Fixed in 4.1.4 Patch available GHSA-58mr-gqgx-xq4g
Remediation
- Fix · CNA fast-uri (fast-uri) Fixed in 2.4.6, 3.1.7, 4.1.4
- Fix · GHSA-58mr-gqgx-xq4g fast-uri (npm) Fixed in 2.4.6 Advisory →
- Fix · GHSA-58mr-gqgx-xq4g fast-uri (npm) Fixed in 3.1.7 Advisory →
- Fix · GHSA-58mr-gqgx-xq4g fast-uri (npm) Fixed in 4.1.4 Advisory →
Red Hat 41 advisories
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- Red Hat Openshift Data Foundation 4.19 registry.redhat.io/odf4/cephcsi-rhel9, registry.redhat.io/odf4/cephcsi-rhel9-operator, registry.redhat.io/odf4/mcg-core-rhel9 +17
- RHSA-2026:90321 Released 2026-10-26 · Red Hat rating CriticalRed Hat OpenShift Dev Spaces 3.31.0 Release.
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- RHSA-2026:84734 Released 2026-10-19 · Red Hat rating CriticalRHOAI 3.4.5 - Red Hat OpenShift AI
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- Red Hat Quay 3.17 registry.redhat.io/quay/quay-rhel9
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- RHSA-2026:70593 Released 2026-09-23 · Red Hat rating ImportantNetwork Observability 1.12.3 for OpenShift
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- Red Hat OpenShift Container Platform 4.20 registry.redhat.io/openshift4/nmstate-console-plugin-rhel9
- RHSA-2026:68553 Released 2026-09-22 · Red Hat rating ImportantOpenShift Container Platform 4.22.15 security and extras update
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- RHSA-2026:68547 Released 2026-09-22 · Red Hat rating ImportantOpenShift Container Platform 4.21.34 security and extras update
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- RHSA-2026:69289 Released 2026-09-21 · Red Hat rating ImportantA Subscription Management tool for finding and reporting Red Hat product usage
- Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
- RHSA-2026:69248 Released 2026-09-21 · Red Hat rating ImportantRed Hat Developer Hub 1.9.9 release.
- Red Hat Developer Hub 1.9 registry.redhat.io/rhdh/rhdh-hub-rhel9, registry.redhat.io/rhdh/rhdh-rhel9-operator
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- Red Hat Edge Manager 1.2 registry.redhat.io/rhem/flightctl-alert-exporter-rhel9, registry.redhat.io/rhem/flightctl-alertmanager-proxy-rhel9, registry.redhat.io/rhem/flightctl-api-rhel9 +11
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Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
fast-uri 2.4.6, 3.1.7, 4.1.4
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-57933 fast-uri vulnerable to authority injection via an unvalidated port in serializePriority LOW 38
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Cost Management On Premise | Affected | No fix yet |
| Multicluster Engine for Kubernetes | Affected | No fix yet |
| OpenShift Lightspeed | Affected | No fix yet |
| OpenShift Pipelines | Affected | No fix yet |
| OpenShift Serverless | Affected | No fix yet |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
| Red Hat Build of Podman Desktop | Affected | No fix yet |
| Red Hat Connectivity Link 1 | Affected | No fix yet |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
| Red Hat Openshift Data Foundation 4 | Affected | No fix yet |
| Red Hat Satellite 6 | Affected | No fix yet |
| Red Hat build of Apache Camel - HawtIO 4 | Affected | No fix yet |
| Red Hat build of Apicurio Registry 3 | Affected | No fix yet |
| Secrets Management Console for Red Hat OpenShift | Affected | No fix planned: Will not fix |
| Cluster Observability Operator 1.5 | Fixed | RHSA-2026:74609 |
| Network Observability (NETOBSERV) 1.12.3 | Fixed | RHSA-2026:70593 |
| Red Hat Ansible Automation Platform 2.1 | Fixed | RHSA-2026:65118 |
| Red Hat Ansible Automation Platform 2.2 | Fixed | RHSA-2026:65155, RHSA-2026:82151 |
| Red Hat Ansible Automation Platform 2.6 | Fixed | RHSA-2026:71179 |
| Red Hat Ansible Automation Platform 2.7 | Fixed | RHSA-2026:71177 |
| Red Hat Developer Hub 1.10 | Fixed | RHSA-2026:76788, RHSA-2026:79088 |
| Red Hat Developer Hub 1.9 | Fixed | RHSA-2026:69248 |
| Red Hat Discovery 2 | Fixed | RHSA-2026:69289 |
| Red Hat Edge Manager 1.1 | Fixed | RHSA-2026:68044, RHSA-2026:68253 |
| Red Hat Edge Manager 1.2 | Fixed | RHSA-2026:68006, RHSA-2026:68254 |
| Red Hat Hardened Images | Fixed | RHSA-2026:63782, RHSA-2026:65537, RHSA-2026:65617 |
| Red Hat Migration Toolkit 1.8 | Fixed | RHSA-2026:68681 |
| Red Hat OpenShift AI 2.25 | Fixed | RHSA-2026:87410 |
| Red Hat OpenShift AI 3.4 | Fixed | RHSA-2026:84734 |
| Red Hat OpenShift AI 3.5 | Fixed | RHSA-2026:86891 |
| Red Hat OpenShift Container Platform 4.18 | Fixed | RHSA-2026:79040 |
| Red Hat OpenShift Container Platform 4.19 | Fixed | RHSA-2026:74435 |
| Red Hat OpenShift Container Platform 4.20 | Fixed | RHSA-2026:68543 |
| Red Hat OpenShift Container Platform 4.21 | Fixed | RHSA-2026:68547 |
| Red Hat OpenShift Container Platform 4.22 | Fixed | RHSA-2026:68553 |
| Red Hat OpenShift Dev Spaces 3.30 | Fixed | RHSA-2026:68754 |
| Red Hat OpenShift Dev Spaces 3.31 | Fixed | RHSA-2026:90321 |
| Red Hat Openshift Data Foundation 4.19 | Fixed | RHSA-2026:92650 |
| Red Hat Quay 3.17 | Fixed | RHSA-2026:74511 |
| Red Hat Quay 3.9 | Fixed | RHSA-2026:77656 |
| Red Hat Satellite 6.18 | Fixed | RHSA-2026:68756, RHSA-2026:68762, RHSA-2026:74633, RHSA-2026:79377 |
| Red Hat Satellite 6.19 | Fixed | RHSA-2026:68747, RHSA-2026:68748, RHSA-2026:68750, RHSA-2026:74624 |
| Red Hat Satellite 6.19 for RHEL 9 | Fixed | RHSA-2026:74503 |
Not affected: 41 products
- Cluster Observability Operator 1.5
- Cryostat 4
- Migration Toolkit for Applications 8
- Network Observability (NETOBSERV) 1.12.3
- Red Hat AMQ Broker 7
- Red Hat Ansible Automation Platform 2
- Red Hat Ansible Automation Platform 2.6
- Red Hat Ansible Automation Platform 2.7
- Red Hat Build of Podman Desktop
- Red Hat Data Grid 8
- Red Hat Developer Hub 1.10
- Red Hat Developer Hub 1.9
- Red Hat Directory Server 11
- Red Hat Directory Server 12
- Red Hat Discovery 2
- Red Hat Edge Manager 1.1
- Red Hat Edge Manager 1.2
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Hardened Images
- Red Hat Migration Toolkit 1.8
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift AI 2.25
- Red Hat OpenShift AI 3.4
- Red Hat OpenShift AI 3.5
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 4.18
- Red Hat OpenShift Container Platform 4.19
- Red Hat OpenShift Container Platform 4.20
- Red Hat OpenShift Container Platform 4.21
- Red Hat OpenShift Container Platform 4.22
- Red Hat OpenShift Container Platform 5
- Red Hat OpenShift Dev Spaces 3.30
- Red Hat OpenShift Dev Spaces 3.31
- Red Hat Openshift Data Foundation 4
- Red Hat Openshift Data Foundation 4.19
- Red Hat Quay 3
- Red Hat Quay 3.17
- Red Hat Quay 3.9
- Red Hat Satellite 6.19 for RHEL 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-84394
- 2026-10-03 Alias added: GHSA-58mr-gqgx-xq4g
- 2026-10-05 Affected versions changed · Red Hat
- 2026-10-07 Fix available: RHSA-2026:76788 · Red Hat
- 2026-10-07 Fix available: Red Hat Developer Hub 1.10 · Red Hat
- 2026-10-07 Fix available: RHSA-2026:74435 · Red Hat
- 2026-10-07 Fix available: Red Hat OpenShift Container Platform 4.19 · Red Hat
- 2026-10-07 Fix available: RHSA-2026:77656 · Red Hat
- 2026-10-08 Fix available: Red Hat Quay 3.9 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79088 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79377 · Red Hat
- 2026-10-09 Affected versions changed · Red Hat
- 2026-10-13 Affected versions changed · Red Hat
- 2026-10-13 Fix available: RHSA-2026:82151 · Red Hat
- 2026-10-16 Fix available: RHSA-2026:79040 · Red Hat
- 2026-10-16 Fix available: Red Hat OpenShift Container Platform 4.18 · Red Hat
- 2026-10-20 Fix available: RHSA-2026:84734 · Red Hat
- 2026-10-20 Fix available: Red Hat OpenShift AI 3.4 · Red Hat
- 2026-10-22 Fix available: RHSA-2026:86891 · Red Hat
- 2026-10-22 Fix available: RHSA-2026:87410 · Red Hat
- 2026-10-23 Fix available: Red Hat OpenShift AI 2.25, Red Hat OpenShift AI 3.5 · Red Hat
- 2026-10-29 Fix available: Red Hat OpenShift Dev Spaces 3.31 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:90321 · Red Hat
- 2026-10-30 Affected versions changed · Red Hat
- 2026-10-30 Fix available: Red Hat Openshift Data Foundation 4.19 · Red Hat
- 2026-10-31 Fix available: RHSA-2026:92650 · Red Hat
- 2026-11-05 Fix available: Cluster Observability Operator 1.5 · Red Hat
- 2026-11-06 Fix available: RHSA-2026:71177 · Red Hat
References
Advisory 3
Other 6
- https://github.com/fastify/fast-uri/pull/214
- https://github.com/fastify/fast-uri/commit/e00815236bc94107e44ef1b2f5318a06bac225c0
- https://github.com/fastify/fast-uri
- https://github.com/fastify/fast-uri/releases/tag/v2.4.6
- https://github.com/fastify/fast-uri/releases/tag/v3.1.7
- https://github.com/fastify/fast-uri/releases/tag/v4.1.4
More Fast-uri vulnerabilities
- TI-2026-11539 fast-uri vulnerable to host confusion via failed IDN canonicalization CVSS 3.1HIGH 7.5
- TI-2026-05545 fast-uri vulnerable to path traversal via percent-encoded dot segments CVSS 3.1HIGH 7.5
- TI-2026-53157 fast-uri vulnerable to host confusion via skipped IDN canonicalization on scheme-relative references CVSS 3.1HIGH 7.5
- TI-2026-15158 fast-uri vulnerable to host confusion via backslash authority introducer CVSS 3.1HIGH 7.5
- TI-2026-13562 fast-uri vulnerable to host confusion via literal backslash authority delimiter CVSS 3.1HIGH 7.5
- TI-2026-05546 fast-uri vulnerable to host confusion via percent-encoded authority delimiters CVSS 3.1HIGH 7.5
Sources
- CVE-2026-84394 · CVE Program
- CVE-2026-84394 · NVD
- FIRST EPSS
- GHSA-58mr-gqgx-xq4g · GitHub Advisory Database · CC BY 4.0
- CVE-2026-84394 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences