{"cve":"CVE-2026-104871","nvd":{"published":"2026-10-02T20:17:00.910","modified":"2026-10-06T16:00:36.547","status":"Awaiting Analysis","description":"The Angular SSR is a server-rise rendering tool for Angular applications. Prior to versions 20.3.36, 21.2.23, and 22.1.7, the CommonEngine retrieveSSGPage prerendered-page retrieval logic in @angular/ssr/node, and in @angular/ssr for versions 17 through 18, accepts a relative request URL containing a backslash parent-traversal segment on Windows. The non-special resolve:// URL base preserves the backslash, path.join interprets it as a Windows separator, and the pagePath.startsWith(normalize(publicPath)) check incorrectly accepts a sibling output directory whose name shares the configured public-directory prefix. An unauthenticated requester can therefore retrieve a sibling prerendered HTML page when that page contains the Angular SSG marker. The issue is limited to Windows deployments that pass relative request URLs to CommonEngine.render, have a prefix-sharing sibling output directory, and contain qualifying prerendered Angular HTML; it does not provide arbitrary file read. This issue is fixed in versions 20.3.36, 21.2.23, and 22.1.7.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","score":6.3},"cvss_v3":null,"cwes":["CWE-22"],"references":["https://github.com/angular/angular-cli/commit/645e41a47d21b7651837a4250de99af0509626e2","https://github.com/angular/angular-cli/commit/70748ca8e76fe4b42798719410336119d943e755","https://github.com/angular/angular-cli/commit/bb72145f9ab45aee29f523236b3a25cd0813a841","https://github.com/angular/angular-cli/commit/c3e5982e49705f0f6a913cb94622b4c555d2d914","https://github.com/angular/angular-cli/releases/tag/v20.3.36"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:57:46.668721662+00:00"},"epss":{"cve":"CVE-2026-104871","score":0.00421,"percentile":0.36179,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-7g7c-h8rr-7p6q","url":"https://osv.dev/vulnerability/GHSA-7g7c-h8rr-7p6q","summary":"Angular SSR: Path Traversal to Sibling Directories in CommonEngine on Windows","modified":"2026-10-05T23:00:04.245230888Z","packages":[{"ecosystem":"npm","name":"@angular/ssr","purl":"pkg:npm/%40angular/ssr","ranges":[">=22.0.0 <22.1.7"],"fixed":["22.1.7"]},{"ecosystem":"npm","name":"@angular/ssr","purl":"pkg:npm/%40angular/ssr","ranges":[">=21.0.0 <21.2.23"],"fixed":["21.2.23"]},{"ecosystem":"npm","name":"@angular/ssr","purl":"pkg:npm/%40angular/ssr","ranges":[">=20.0.0 <20.3.36"],"fixed":["20.3.36"]},{"ecosystem":"npm","name":"@angular/ssr","purl":"pkg:npm/%40angular/ssr","ranges":["<=19.2.27"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}