{"id":"CVE-2026-75975","title":"fast-uri is a URI parser for Node.js","summary":"fast-uri is a URI parser for Node.js. Its custom parser for bracketed IPv6 literals does not validate the complete IPv6 grammar, so invalid trailing text in an authority can be silently discarded and a malformed attacker-controlled host …","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-20","CWE-918"],"vendor":"openjsf","product":"fast-uri","affected":["fast-uri >= 2.3.1, < 2.4.5","fast-uri >= 3.0.0, < 3.1.6","fast-uri >= 4.0.0, < 4.1.3"],"patched":["fast-uri 4.1.3"],"published":"2026-08-24","updated":"2026-10-14","sourceUpdated":"2026-10-14T13:10:00.187","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-75975","references":[{"url":"https://cna.openjsf.org/security-advisories.html","label":"ce714d77-add3-4f53-aff5-83d477b104bb"},{"url":"https://github.com/fastify/fast-uri/security/advisories/GHSA-f65p-4m7j-42xc","label":"ce714d77-add3-4f53-aff5-83d477b104bb"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75975.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-75975"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2521779"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-75975"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75975"},{"url":"https://access.redhat.com/errata/RHSA-2026:74503"},{"url":"https://access.redhat.com/errata/RHSA-2026:71543"},{"url":"https://access.redhat.com/errata/RHSA-2026:74609"},{"url":"https://access.redhat.com/errata/RHSA-2026:70593"},{"url":"https://access.redhat.com/errata/RHSA-2026:67542"},{"url":"https://access.redhat.com/errata/RHSA-2026:72880"},{"url":"https://access.redhat.com/errata/RHSA-2026:67543"},{"url":"https://access.redhat.com/errata/RHSA-2026:65118"},{"url":"https://access.redhat.com/errata/RHSA-2026:65155"},{"url":"https://access.redhat.com/errata/RHSA-2026:71179"},{"url":"https://access.redhat.com/errata/RHSA-2026:67279"},{"url":"https://access.redhat.com/errata/RHSA-2026:76788"},{"url":"https://access.redhat.com/errata/RHSA-2026:69248"},{"url":"https://access.redhat.com/errata/RHSA-2026:61783"},{"url":"https://access.redhat.com/errata/RHSA-2026:68044"},{"url":"https://access.redhat.com/errata/RHSA-2026:68253"},{"url":"https://access.redhat.com/errata/RHSA-2026:68006"},{"url":"https://access.redhat.com/errata/RHSA-2026:68254"},{"url":"https://access.redhat.com/errata/RHSA-2026:60866"},{"url":"https://access.redhat.com/errata/RHSA-2026:60855"},{"url":"https://access.redhat.com/errata/RHSA-2026:60856"},{"url":"https://access.redhat.com/errata/RHSA-2026:68681"},{"url":"https://access.redhat.com/errata/RHSA-2026:68547"},{"url":"https://access.redhat.com/errata/RHSA-2026:68553"},{"url":"https://access.redhat.com/errata/RHSA-2026:68754"},{"url":"https://access.redhat.com/errata/RHSA-2026:68762"},{"url":"https://access.redhat.com/errata/RHSA-2026:68756"},{"url":"https://access.redhat.com/errata/RHSA-2026:68766"},{"url":"https://access.redhat.com/errata/RHSA-2026:68765"},{"url":"https://access.redhat.com/errata/RHSA-2026:68748"},{"url":"https://access.redhat.com/errata/RHSA-2026:68750"},{"url":"https://access.redhat.com/errata/RHSA-2026:68747"},{"url":"https://github.com/fastify/fast-uri/commit/3728465caacef4b16bc84b7d14760f1c8fe41595"},{"url":"https://github.com/fastify/fast-uri/commit/607bfbe953f28a14c2e06ae64aff38c81ca2937f"},{"url":"https://github.com/fastify/fast-uri/commit/9161eded1ff55fad9d9714c6ad6c0f0283547799"},{"url":"https://github.com/fastify/fast-uri/releases/tag/v2.4.5"},{"url":"https://github.com/fastify/fast-uri/releases/tag/v3.1.6"},{"url":"https://github.com/fastify/fast-uri/releases/tag/v4.1.3"},{"url":"https://github.com/advisories/GHSA-f65p-4m7j-42xc"},{"url":"https://access.redhat.com/errata/RHSA-2026:82151"},{"url":"https://access.redhat.com/errata/RHSA-2026:79088"}],"tags":["nvd","csaf","vex","red-hat","ghsa","npm"],"epss":0.0022,"epssPercentile":0.12456,"aliases":["GHSA-f65p-4m7j-42xc"],"ecosystem":"npm","ingestedAt":"2026-09-02T15:46:29.227Z","slug":"CVE-2026-75975","body":"## Overview\n\nfast-uri is a URI parser for Node.js. Its custom parser for bracketed IPv6 literals does not validate the complete IPv6 grammar, so invalid trailing text in an authority can be silently discarded and a malformed attacker-controlled host is turned into a different valid IPv6 destination. For example, a bracketed literal with invalid trailing characters is normalized to the unspecified address, which a Node HTTP client then connects to a local service over loopback, and other malformed literals collapse to private-range addresses. No error is set on the parsed result, so an application checking the error field cannot detect the rewrite. An application that normalizes untrusted URLs before outbound requests, redirects, proxy routing, or address-policy enforcement can be redirected to a local or private IPv6 target, giving a server-side request forgery and address-policy bypass primitive. The affected versions are 2.3.1 up to but not including 2.4.5, 3.0.0 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which validate bracketed IP literals against the full grammar and mark malformed literals as authority errors. Users should upgrade to a patched version.\n\n## Affected\n\n- `fast-uri >= 2.3.1, < 2.4.5`\n- `fast-uri >= 3.0.0, < 3.1.6`\n- `fast-uri >= 4.0.0, < 4.1.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `fast-uri 4.1.3`\n\n## Package advisory (CVE-2026-75975)\n\nAffected packages:\n\n- `fast-uri >= 2.3.1, < 2.4.5`\n- `fast-uri >= 3.0.0, < 3.1.6`\n- `fast-uri >= 4.0.0, < 4.1.3`\n\nPatched in:\n\n- `fast-uri 2.4.5`\n- `fast-uri 3.1.6`\n- `fast-uri 4.1.3`\n\nSource: https://github.com/advisories/GHSA-f65p-4m7j-42xc\n\n## Vendor advisories\n\n- **RHSA-2026:74503** · Red Hat · fixed in: Red Hat Satellite 6.19 for RHEL 9 · released 2026-10-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:74503)\n- **RHSA-2026:71543** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:71543)\n- **RHSA-2026:74609** · Red Hat · fixed in: Cluster Observability Operator 1.5.3 · released 2026-10-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:74609)\n- **RHSA-2026:70593** · Red Hat · fixed in: Network Observability (NETOBSERV) 1.12.3 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70593)\n- **RHSA-2026:67542** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.16 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67542)\n- **RHSA-2026:72880** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.16 · released 2026-09-28 · [advisory](https://access.redhat.com/errata/RHSA-2026:72880)\n- **RHSA-2026:67543** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.17 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:67543)\n- **RHSA-2026:65118** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.1 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65118)\n- **RHSA-2026:65155** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:65155)\n- **RHSA-2026:71179** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.6 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:71179)\n- **RHSA-2026:67279** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.7 · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67279)\n- **Red Hat VEX** · Important · affected: Cost Management On Premise, OpenShift Lightspeed, OpenShift Pipelines, OpenShift Serverless, Red Hat Ansible Automation Platform 2, Red Hat build of Apicurio Registry 3, … · no fix planned: Red Hat Ansible Automation Platform 2, Red Hat Data Grid 8, Red Hat Enterprise Linux AI (RHEL AI) 3, Secrets Management Console for Red Hat OpenShift, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75975.json)\n- **RHSA-2026:69248** · Red Hat · fixed in: Red Hat Developer Hub 1.9 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69248)\n- **RHSA-2026:61783** · Red Hat · fixed in: Red Hat Discovery 2 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61783)\n- **RHSA-2026:68044** · Red Hat · fixed in: Red Hat Edge Manager 1.1 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68044)\n- **RHSA-2026:68253** · Red Hat · fixed in: Red Hat Edge Manager 1.1 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68253)\n- **RHSA-2026:68006** · Red Hat · fixed in: Red Hat Edge Manager 1.2 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68006)\n- **RHSA-2026:68254** · Red Hat · fixed in: Red Hat Edge Manager 1.2 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68254)\n- **RHSA-2026:60866** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:60866)\n- **RHSA-2026:60855** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:60855)\n- **RHSA-2026:60856** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:60856)\n- **RHSA-2026:82151** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.2 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82151)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}