{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-2880", "tracking": { "current_release_date": "2026-03-30T18:47:57.802801Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-2880", "initial_release_date": "2026-02-27T19:27:26.569421Z", "revision_history": [ { "date": "2026-02-27T19:27:26.569421Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-02-27T19:27:28.838585Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-02-27T19:38:56.366092Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (1).| CWES updated (1).| Unknown change." }, { "date": "2026-02-27T19:38:57.912333Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-02-28T03:39:42.717936Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (7).| CWES updated (1)." }, { "date": "2026-02-28T03:39:50.089860Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-02-28T14:13:36.117096Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-02-28T14:13:49.224654Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-02-28T17:18:59.994047Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (6).| CWES updated (1)." }, { "date": "2026-02-28T17:19:02.983405Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:36:00.985098Z", "number": "11", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:36:05.102898Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-03-20T18:16:07.368071Z", "number": "13", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| Product Identifiers created (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-20T18:16:10.752071Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-30T18:47:54.182445Z", "number": "15", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (2).| References created (8).| CWES updated (1)." }, { "date": "2026-03-30T18:47:56.342906Z", "number": "16", "summary": "NCSC Score updated." } ], "status": "interim", "version": "16" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:semver/0.0.0|<9.2.0", "product": { "name": "vers:semver/0.0.0|<9.2.0", "product_id": "CSAFPID-5736299" } } ], "category": "product_name", "name": "@fastify/middie" } ], "category": "vendor", "name": "@fastify/middie" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/>=0|<9.2.0", "product": { "name": "vers:unknown/>=0|<9.2.0", "product_id": "CSAFPID-5750238" } } ], "category": "product_name", "name": "@fastify/middie" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/9.2.0", "product": { "name": "vers:unknown/9.2.0", "product_id": "CSAFPID-5965574" } }, { "category": "product_version_range", "name": "vers:unknown/<9.2.0", "product": { "name": "vers:unknown/<9.2.0", "product_id": "CSAFPID-5965575" } } ], "category": "product_name", "name": "npm/@fastify/middie" } ], "category": "vendor", "name": "fastify" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<9.2.0", "product": { "name": "vers:unknown/<9.2.0", "product_id": "CSAFPID-5873823", "product_identification_helper": { "cpe": "cpe:2.3:a:openjsf:\\@fastify\\/middie:*:*:*:*:*:fastify:*:*" } } } ], "category": "product_name", "name": "\\@fastify\\/middie" } ], "category": "vendor", "name": "openjsf" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-2880", "notes": [ { "category": "description", "text": "A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)).\n\nWhen Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-2880" }, { "category": "description", "text": "A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)).\n\nWhen Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-2880" }, { "category": "description", "text": "## Summary\nA path normalization inconsistency in `@fastify/middie` can result in authentication/authorization bypass when using path-scoped middleware (for example, `app.use('/secret', auth)`).\n\nWhen Fastify router normalization options are enabled (such as `ignoreDuplicateSlashes`, `useSemicolonDelimiter`, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.\n\n## Impact\nAn unauthenticated remote attacker can access endpoints intended to be protected by middleware-based auth/authorization controls by sending specially crafted URL paths (for example, `//secret` or `/secret;foo=bar`), depending on router option configuration.\n\nThis may lead to unauthorized access to protected functionality and data exposure.\n\n## Affected versions\n- Confirmed affected: `@fastify/middie@9.1.0`\n- All versions prior to the patch are affected.\n\n## Patched versions\n- Fixed in: *9.2.0*\n\n## Details\nThe issue is caused by canonicalization drift between:\n1. `@fastify/middie` path matching for `app.use('/prefix', ...)`, and\n2. Fastify/find-my-way route lookup normalization.\n\nBecause middleware and router did not always evaluate the same normalized path, auth middleware could be skipped while route resolution still succeeded.\n\n## Workarounds\nUntil patched version is deployed:\n- Avoid relying solely on path-scoped middie guards for auth/authorization.\n- Enforce auth at route-level handlers/hooks after router normalization.\n- Disable risky normalization combinations only if operationally feasible.\n\n## Resources\n- Fluid Attacks Disclosure Policy: https://fluidattacks.com/advisories/policy\n- Fluid Attacks advisory URL: https://fluidattacks.com/advisories/jimenez\n\n## Credits\n- **Cristian Vargas** (Fluid Attacks Research Team) — discovery and report.\n- **Oscar Uribe** (Fluid Attacks) — coordination and disclosure.", "title": "github - https://github.com/advisories/GHSA-8p85-9qpw-fwgw" }, { "category": "description", "text": "## Summary\nA path normalization inconsistency in `@fastify/middie` can result in authentication/authorization bypass when using path-scoped middleware (for example, `app.use('/secret', auth)`).\n\nWhen Fastify router normalization options are enabled (such as `ignoreDuplicateSlashes`, `useSemicolonDelimiter`, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.\n\n## Impact\nAn unauthenticated remote attacker can access endpoints intended to be protected by middleware-based auth/authorization controls by sending specially crafted URL paths (for example, `//secret` or `/secret;foo=bar`), depending on router option configuration.\n\nThis may lead to unauthorized access to protected functionality and data exposure.\n\n## Affected versions\n- Confirmed affected: `@fastify/middie@9.1.0`\n- All versions prior to the patch are affected.\n\n## Patched versions\n- Fixed in: *9.2.0*\n\n## Details\nThe issue is caused by canonicalization drift between:\n1. `@fastify/middie` path matching for `app.use('/prefix', ...)`, and\n2. Fastify/find-my-way route lookup normalization.\n\nBecause middleware and router did not always evaluate the same normalized path, auth middleware could be skipped while route resolution still succeeded.\n\n## Workarounds\nUntil patched version is deployed:\n- Avoid relying solely on path-scoped middie guards for auth/authorization.\n- Enforce auth at route-level handlers/hooks after router normalization.\n- Disable risky normalization combinations only if operationally feasible.\n\n## Resources\n- Fluid Attacks Disclosure Policy: https://fluidattacks.com/advisories/policy\n- Fluid Attacks advisory URL: https://fluidattacks.com/advisories/jimenez\n\n## Credits\n- **Cristian Vargas** (Fluid Attacks Research Team) — discovery and report.\n- **Oscar Uribe** (Fluid Attacks) — coordination and disclosure.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-8p85-9qpw-fwgw.json?alt=media" }, { "category": "description", "text": "A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)).\n\nWhen Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-2880" }, { "category": "description", "text": "A path normalization inconsistency in `@fastify/middie` can result in authentication/authorization bypass when using path-scoped middleware (for example, `app.use('/secret', auth)`).\n\nWhen Fastify router normalization options are enabled (such as `ignoreDuplicateSlashes`, `useSemicolonDelimiter`, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.", "title": "gitlab - https://gitlab.com/api/v4/projects/25847700/repository/files/npm%2F@fastify%2Fmiddie%2FCVE-2026-2880.yml/raw" }, { "category": "other", "text": "0.00166", "title": "EPSS" }, { "category": "other", "text": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "title": "CVSSV4" }, { "category": "other", "text": "8.2", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.2", "title": "NCSC Score" }, { "category": "other", "text": "The value of the most recent EPSS score, Is related to an uncommon product vendor", "title": "NCSC Score top decreasing factors" } ], "product_status": { "fixed": [ "CSAFPID-5965574" ], "known_affected": [ "CSAFPID-5736299", "CSAFPID-5750238", "CSAFPID-5873823", "CSAFPID-5965575" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2880" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-2880" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-2880" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/2xxx/CVE-2026-2880.json" }, { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-8p85-9qpw-fwgw" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-8p85-9qpw-fwgw" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-2880" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/npm%2FGHSA-8p85-9qpw-fwgw.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-2880" }, { "category": "external", "summary": "Source - gitlab", "url": "https://gitlab.com/api/v4/projects/25847700/repository/files/npm%2F@fastify%2Fmiddie%2FCVE-2026-2880.yml/raw" }, { "category": "external", "summary": "Reference - cveprojectv5; github; gitlab; nvd; osv", "url": "https://github.com/fastify/middie/security/advisories/GHSA-8p85-9qpw-fwgw" }, { "category": "external", "summary": "Reference - github; gitlab; osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2880" }, { "category": "external", "summary": "Reference - github; gitlab; osv", "url": "https://github.com/fastify/middie/commit/140e0dd0359d890fec7e6ea1dcc5134d6bd554d4" }, { "category": "external", "summary": "Reference - github; gitlab; osv", "url": "https://fluidattacks.com/advisories/jimenez" }, { "category": "external", "summary": "Reference - github; gitlab; osv", "url": "https://fluidattacks.com/advisories/policy" }, { "category": "external", "summary": "Reference - github; gitlab; osv", "url": "https://github.com/fastify/middie/releases/tag/v9.2.0" }, { "category": "external", "summary": "Reference - github; gitlab", "url": "https://github.com/advisories/GHSA-8p85-9qpw-fwgw" }, { "category": "external", "summary": "Reference - gitlab", "url": "https://github.com/fastify/middie" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 9.1, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-5736299", "CSAFPID-5750238", "CSAFPID-5873823", "CSAFPID-5965575" ] } ], "title": "CVE-2026-2880" } ] }