{"id":"CVE-2026-76172","title":"fast-uri is a URI parser for Node.js","summary":"fast-uri is a URI parser for Node.js. During parsing it runs a legacy decoding pass over the scheme component and never re-escapes the result, and serialization writes the scheme back out verbatim, unlike the host component which is re-e…","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-177","CWE-76"],"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-2026-76172","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-jqff-g426-hqxp","label":"ce714d77-add3-4f53-aff5-83d477b104bb"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76172.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-76172"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2521798"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-76172"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76172"},{"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/37f3417c82994279656854f83ce938acd81c3862"},{"url":"https://github.com/fastify/fast-uri/commit/a941e626411f576f8d90883231e57b6c9d0ff98b"},{"url":"https://github.com/fastify/fast-uri/commit/c6a74bfd9d8c6b0df5362b3c7ae88d8021cb1e39"},{"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-jqff-g426-hqxp"},{"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":0.00232,"epssPercentile":0.14003,"aliases":["GHSA-jqff-g426-hqxp"],"ecosystem":"npm","ingestedAt":"2026-09-02T15:46:29.310Z","slug":"CVE-2026-76172","body":"## Overview\n\nfast-uri is a URI parser for Node.js. During parsing it runs a legacy decoding pass over the scheme component and never re-escapes the result, and serialization writes the scheme back out verbatim, unlike the host component which is re-escaped. As a result an input whose scheme carries percent-encoded slashes parses as a scheme with no authority, so the parsed host and error are both undefined, yet resolving or normalizing that same input emits a network-path reference whose authority is attacker-chosen and re-parses to that host. An application that allowlists on the parsed host, or treats a reference with no authority as safe to resolve against its base, gets the opposite of what it checked, giving an off-site redirect, server-side request forgery, or address-policy bypass. The legacy decoder also expands non-standard escape forms, widening the issue past upstream filters, and control characters in the scheme can reach the output as raw carriage return and line feed. 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 reject a scheme that is not valid after decoding. 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-2026-76172)\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-jqff-g426-hqxp\n\n## Vendor advisories\n\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- **RHSA-2026:76788** · Red Hat · fixed in: Red Hat Developer Hub 1.10 · released 2026-10-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:76788)\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 Enterprise Linux AI (RHEL AI) 3, Secrets Management Console for Red Hat OpenShift, Cost Management On Premise, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76172.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":[]}