{"id":"CVE-2026-44437","revision":null,"records":[{"revision":"e7c4b32809614a84b160fa37484fd175","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-44437","aliases":[],"title":"Angular SSR: Open Redirect and Request Steering via Encoded X-Forwarded-Prefix","description":"The Angular SSR is a server-rise rendering tool for Angular applications. From 19.0.0-next.0 to before 19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7, a vulnerability exists in the X-Forwarded-Prefix header processing logic within Angular SSR. The internal validation mechanism fails to properly account for URL-encoded characters, specifically dots (%2e%2e). This allows an attacker to bypass security filters by injecting encoded path traversal sequences that are later decoded and utilized by the application logic.\nWhen an Angular SSR application is configured to trust proxy headers and is deployed behind a proxy that forwards the X-Forwarded-Prefix header without prior sanitization, an attacker can provide a payload such as /%2e%2e/evil. This vulnerability is fixed in19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7.","state":0,"publishedAt":"2026-05-13T21:23:59.26+00:00","modifiedAt":"2026-05-14T13:35:18.562+00:00","affected":[{"ecosystem":"Vendor product","name":"angular-cli","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"angular\",\n                    \"product\": \"angular-cli\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 22.0.0-next.0, < 22.0.0-next.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 21.0.0-next.0, < 21.2.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 20.0.0-next.0, < 20.3.25\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 19.0.0-next.0, < 19.2.25\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","score":6.9,"severity":"MEDIUM"}],"references":["https://github.com/angular/angular-cli/security/advisories/GHSA-69xr-m8h6-h664","https://github.com/angular/angular-cli/pull/33031"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-44437","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-44437","identifiers":["CVE-2026-44437"]},"retained":false,"historicalAffected":[]},{"revision":"fc9d250d64f54af7a1d958ea6d9c2dcf","observedAt":"2026-10-28T06:07:37.346+00:00","statement":{"source":"euvd","id":"EUVD-2026-30191","aliases":["CVE-2026-44437","GHSA-69xr-m8h6-h664"],"title":"The Angular SSR is a server-rise rendering tool for Angular applications. 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This vulnerability is fixed in19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","score":6.9,"severity":null}],"references":["https://github.com/angular/angular-cli/security/advisories/GHSA-69xr-m8h6-h664","https://github.com/angular/angular-cli/pull/33031"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30191","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 13, 2026, 9:23:59 PM","dateUpdated":"May 14, 2026, 1:35:18 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. 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The internal validation mechanism fails to properly account for URL-encoded characters, specifically dots (%2e%2e). This allows an attacker to bypass security filters by injecting encoded path traversal sequences that are later decoded and utilized by the application logic.\nWhen an Angular SSR application is configured to trust proxy headers and is deployed behind a proxy that forwards the X-Forwarded-Prefix header without prior sanitization, an attacker can provide a payload such as /%2e%2e/evil. This vulnerability is fixed in19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7.","state":0,"publishedAt":"2026-05-13T22:16:44.71+00:00","modifiedAt":"2026-10-26T14:10:00.13+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/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","score":6.9,"severity":"MEDIUM"},{"system":"CVSS 3.1 · nvd@nist.gov · Primary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/angular/angular-cli/pull/33031","https://github.com/angular/angular-cli/security/advisories/GHSA-69xr-m8h6-h664"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-44437","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-22","CWE-601"],"productCriteria":["cpe:2.3:a:angular:angular_cli:*:*:*:*:*:node.js:*:*","cpe:2.3:a:angular:angular_cli:22.0.0:next0:*:*:*:node.js:*:*","cpe:2.3:a:angular:angular_cli:22.0.0:next1:*:*:*:node.js:*:*","cpe:2.3:a:angular:angular_cli:22.0.0:next2:*:*:*:node.js:*:*","cpe:2.3:a:angular:angular_cli:22.0.0:next3:*:*:*:node.js:*:*","cpe:2.3:a:angular:angular_cli:22.0.0:next4:*:*:*:node.js:*:*","cpe:2.3:a:angular:angular_cli:22.0.0:next5:*:*:*:node.js:*:*","cpe:2.3:a:angular:angular_cli:22.0.0:next6:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-05-13T22:16:44.710","lastModified":"2026-10-26T14:10:00.130"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-44437","identifiers":["CVE-2026-44437"]},"retained":false,"historicalAffected":[]},{"revision":"917ce49f1b1748dab4a4faa92294fca9","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-69xr-m8h6-h664","aliases":["CVE-2026-44437"],"title":"Angular SSR has Open Redirect and Request Steering via Encoded X-Forwarded-Prefix","description":"### Description\nA vulnerability exists in the `X-Forwarded-Prefix` header processing logic within Angular SSR. The internal validation mechanism fails to properly account for URL-encoded characters, specifically dots (`%2e%2e`). This allows an attacker to bypass security filters by injecting encoded path traversal sequences that are later decoded and utilized by the application logic.\nWhen an Angular SSR application is configured to trust proxy headers and is deployed behind a proxy that forwards the `X-Forwarded-Prefix` header without prior sanitization, an attacker can provide a payload such as `/%2e%2e/evil`.\n\nThe vulnerability manifests in two ways:\n- Open Redirect: The application processes a redirect (e.g., router `redirectTo`). The decoded traversal payload manipulates the Location header, forcing the browser to an unintended path or external domain.\n- Server-Side Request Steering: The manipulated prefix is used as the base path for server-side `HttpClient` requests. This causes the server to make requests to unintended internal paths or external endpoints.\n\n### Attack Preconditions\n- The application must use Angular SSR.\n- The application must perform internal redirects or use relative URLs in server-side `HttpClient` requests.\n- The upstream infrastructure (Reverse Proxy/CDN) must pass the `X-Forwarded-Prefix` header to the SSR process without stripping or sanitizing it.\n\n### Workarounds\nUntil the patch is applied, developers should manually sanitize the `X-Forwarded-Prefix` header in their `server.ts`. The workaround involves decoding the component to catch encoded traversal attempts before normalization:\n\n\n```ts\napp.use((req, res, next) => {\n  let prefix = req.headers['x-forwarded-prefix'];\n  if (Array.isArray(prefix)) prefix = prefix[0];\n\n  if (prefix) {\n    try {\n      // Decode the prefix to catch encoded characters like %2e (dots)\n      const decodedPrefix = decodeURIComponent(prefix);\n      \n      // Sanitize: remove traversal attempts and ensure a safe leading slash\n      req.headers['x-forwarded-prefix'] = decodedPrefix\n        .replace(/\\.\\./g, '')       // Remove any dot-dot sequences\n        .replace(/^[/\\\\]+/, '/');   // Ensure it starts with exactly one slash\n    } catch (e) {\n      // If decoding fails, remove the potentially malicious header entirely\n      delete req.headers['x-forwarded-prefix'];\n    }\n  }\n  next();\n});\n```\n### Configuring Trusted Proxy Headers\nBy default, Angular ignores all X-Forwarded-* headers. If your application is behind a trusted reverse proxy (like a load balancer) that sets these headers, you can configure Angular to trust them.\nYou can configure trustProxyHeaders when initializing the application engine:\n\n```ts\nconst appEngine = new AngularAppEngine({\n  // Trust specific headers\n  trustProxyHeaders: ['x-forwarded-host', 'x-forwarded-proto', 'x-forwarded-prefix'], \n});\n\nconst nodeAppEngine = new AngularNodeAppEngine({\n  // Trust all X-Forwarded-* headers\n  trustProxyHeaders: true, \n});\n```\n\n### Patches\n- 22.0.0-next.7\n- 21.2.9\n- 20.3.25\n- 19.2.25\n\n### Resources\n\n- https://github.com/angular/angular-cli/pull/33031\n- https://angular.dev/best-practices/security#configuring-trusted-proxy-headers","state":0,"publishedAt":"2026-05-06T23:42:10+00:00","modifiedAt":"2026-05-14T20:50:01.464817+00:00","affected":[{"ecosystem":"npm","name":"@angular/ssr","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"22.0.0-next.0"},{"kind":"fixed","version":"22.0.0-next.7"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@angular/ssr","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"21.0.0-next.0"},{"kind":"fixed","version":"21.2.9"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@angular/ssr","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"20.0.0-next.0"},{"kind":"fixed","version":"20.3.25"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@angular/ssr","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"19.0.0-next.0"},{"kind":"fixed","version":"19.2.25"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/angular/angular-cli/security/advisories/GHSA-69xr-m8h6-h664","https://nvd.nist.gov/vuln/detail/CVE-2026-44437","https://github.com/angular/angular-cli/pull/33031","https://angular.dev/best-practices/security#configuring-trusted-proxy-headers","https://github.com/angular/angular-cli"],"sourceUrl":"https://github.com/advisories/GHSA-69xr-m8h6-h664","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-69xr-m8h6-h664","identifiers":["GHSA-69xr-m8h6-h664","CVE-2026-44437"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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