{"cve":"CVE-2026-44373","nvd":{"published":"2026-05-13T21:16:48.033","modified":"2026-10-26T17:10:03.270","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-22"],"references":["https://github.com/nitrojs/nitro/pull/4222","https://github.com/nitrojs/nitro/pull/4223","https://github.com/nitrojs/nitro/releases/tag/v2.13.4","https://github.com/nitrojs/nitro/releases/tag/v3.0.260429-beta","https://github.com/nitrojs/nitro/security/advisories/GHSA-5w89-w975-hf9q"],"products":["nitro:nitro"],"source":"nvd","synced_at":"2026-10-26T17:39:09.812804557+00:00"},"epss":{"cve":"CVE-2026-44373","score":0.00453,"percentile":0.39073,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-5w89-w975-hf9q","url":"https://osv.dev/vulnerability/GHSA-5w89-w975-hf9q","summary":"Nitro has a proxy scope bypass via percent-encoded path traversal in `routeRules`","modified":"2026-05-14T20:48:31.940118Z","packages":[{"ecosystem":"npm","name":"nitro","purl":"pkg:npm/nitro","ranges":["<3.0.260429-beta"],"fixed":["3.0.260429-beta"]},{"ecosystem":"npm","name":"nitropack","purl":"pkg:npm/nitropack","ranges":["<2.13.4"],"fixed":["2.13.4"]}]}],"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."]}