{"id":"CVE-2026-44373","aliases":["GHSA-5w89-w975-hf9q"],"url":"https://o3.security/vulnerability/CVE-2026-44373","summary":"Nitro: Proxy scope bypass via percent-encoded path traversal in `routeRules`","details":"Nitro is a next generation server toolkit. Prior to 3.0.260429-beta, an attacker could bypass a proxy route rule by sending percent-encoded path traversal (..%2f) in the URL, causing Nitro to forward a request that the upstream resolved outside the configured scope. This vulnerability is fixed in 3.0.260429-beta.","published":"2026-05-13T20:26:28.255Z","modified":"2026-08-05T03:32:36.201907195Z","cvss":{"score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"nitro","fixedVersion":"3.0.260429-beta"},{"ecosystem":"npm","name":"nitropack","fixedVersion":"2.13.4"}],"fix":{"url":"https://github.com/nitrojs/nitro/pull/4222","label":"nitrojs/nitro#4222"},"references":[{"type":"WEB","url":"https://github.com/nitrojs/nitro/releases/tag/v2.13.4"},{"type":"WEB","url":"https://github.com/nitrojs/nitro/releases/tag/v3.0.260429-beta"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44373.json"},{"type":"ADVISORY","url":"https://github.com/nitrojs/nitro/security/advisories/GHSA-5w89-w975-hf9q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44373"},{"type":"FIX","url":"https://github.com/nitrojs/nitro/pull/4222"},{"type":"FIX","url":"https://github.com/nitrojs/nitro/pull/4223"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:32:36.201907195Z"}}