{"id":"CVE-2026-25478","summary":"Litestar has a CORS origin allowlist bypass due to unescaped regex metacharacters in allowed origins","details":"Litestar is an Asynchronous Server Gateway Interface (ASGI) framework. Prior to 2.20.0, CORSConfig.allowed_origins_regex is constructed using a regex built from configured allowlist values and used with fullmatch() for validation. Because metacharacters are not escaped, a malicious origin can match unexpectedly. The check relies on allowed_origins_regex.fullmatch(origin). This vulnerability is fixed in 2.20.0.","aliases":["GHSA-2p2x-hpg8-cqp2"],"modified":"2026-04-10T05:40:08.004794Z","published":"2026-02-09T18:46:56.445Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25478.json","cwe_ids":["CWE-942"],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://docs.litestar.dev/2/release-notes/changelog.html#2.20.0"},{"type":"WEB","url":"https://github.com/litestar-org/litestar/releases/tag/v2.20.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25478.json"},{"type":"ADVISORY","url":"https://github.com/litestar-org/litestar/security/advisories/GHSA-2p2x-hpg8-cqp2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25478"},{"type":"FIX","url":"https://github.com/litestar-org/litestar/commit/eb87703b309efcc0d1b087dcb12784e76b003d5a"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/litestar-org/litestar","events":[{"introduced":"0"},{"fixed":"b343d5a3e6310ecb778a406fa26fc8399139c704"}]}],"versions":["0.7.2","v0.0.1a","v0.1.0","v0.1.0b1","v0.1.1","v0.1.2","v0.1.3","v0.1.4","v0.1.5","v0.1.6","v0.2.0","v0.2.1","v0.3.0","v0.4.0","v0.4.1","v0.4.2","v0.4.3","v0.5.0","v0.6.0","v0.7.0","v0.7.1","v1.0.0","v1.0.1","v1.0.2","v1.0.3","v1.0.4","v1.0.5","v1.1.0","v1.1.1","v1.10.0","v1.10.1","v1.11.0","v1.11.1","v1.12.0","v1.13.0","v1.13.1","v1.14.0","v1.14.1","v1.14.2","v1.15.0","v1.16.0","v1.16.1","v1.16.2","v1.17.0","v1.17.1","v1.17.2","v1.18.0","v1.18.1","v1.19.0","v1.2.0","v1.2.1","v1.2.2","v1.2.3","v1.2.4","v1.2.5","v1.20.0","v1.21.0","v1.21.1","v1.21.2","v1.22.0","v1.23.0","v1.23.1","v1.24.0","v1.25.0","v1.26.0","v1.26.1","v1.27.0","v1.28.0","v1.28.1","v1.29.0","v1.3.0","v1.3.1","v1.3.2","v1.3.3","v1.3.4","v1.3.5","v1.3.6","v1.3.7","v1.3.8","v1.3.9","v1.30.0","v1.31.0","v1.32.0","v1.33.0","v1.34.0","v1.35.0","v1.35.1","v1.36.0","v1.37.0","v1.38.0","v1.39.0","v1.4.0","v1.4.1","v1.4.2","v1.40.0","v1.40.1","v1.41.0","v1.42.0","v1.43.0","v1.43.1","v1.44.0","v1.45.0","v1.45.1","v1.46.0","v1.47.0","v1.48.0","v1.48.1","v1.49.0","v1.5.0","v1.5.1","v1.5.2","v1.5.3","v1.5.4","v1.50.0","v1.50.1","v1.50.2","v1.51.0","v1.6.0","v1.6.1","v1.6.2","v1.6.3","v1.7.0","v1.7.1","v1.7.3","v1.8.0","v1.8.1","v1.9.0","v1.9.1","v2.0.0","v2.0.0alpha1","v2.0.0alpha2","v2.0.0alpha3","v2.0.0alpha4","v2.0.0alpha5","v2.0.0alpha6","v2.0.0alpha7","v2.0.0beta1","v2.0.0beta2","v2.0.0beta3","v2.0.0beta4","v2.0.0rc1","v2.1.0","v2.1.1","v2.10.0","v2.11.0","v2.12.0","v2.12.1","v2.13.0","v2.14.0","v2.15.0","v2.15.1","v2.15.2","v2.16.0","v2.17.0","v2.18.0","v2.19.0","v2.2.0","v2.2.1","v2.3.0","v2.3.1","v2.3.2","v2.4.0","v2.4.1","v2.4.2","v2.4.3","v2.4.4","v2.4.5","v2.5.0","v2.5.1","v2.5.2","v2.5.3","v2.5.4","v2.5.5","v2.6.0","v2.6.1","v2.6.2","v2.6.3","v2.7.0","v2.7.1","v2.8.0","v2.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25478.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N"}]}