{"id":"GHSA-4j9m-h44m-2hv8","revision":"5d9d8610d8fd4d8daa5ac9bfbd6982b1","records":[{"revision":"5d9d8610d8fd4d8daa5ac9bfbd6982b1","observedAt":"2026-10-23T16:01:25.029+00:00","statement":{"source":"osv","id":"GHSA-4j9m-h44m-2hv8","aliases":["CVE-2026-50268"],"title":"Steeltoe: OAEP setting silently selects PKCS#1 v1.5 padding","description":"### Summary\n\nConfiguring `encrypt:rsa:algorithm=OAEP` does not enable OAEP encryption. Due to an incorrect BouncyCastle transformation string, the `OAEP` setting selects PKCS#1 v1.5, which is the same algorithm as the `DEFAULT` setting.\n\n### Impact\n\nOperators who configure `encrypt:rsa:algorithm=OAEP` to obtain CCA2-secure padding receive PKCS#1 v1.5 instead. Currently, `Decrypt()` is called only against operator-controlled configuration data, so no exploitable path exists, but any future code path that exposes a decryption oracle would be Bleichenbacher-vulnerable despite the `OAEP` setting.\n\n### Migration note\n\nExisting `{cipher}` values produced under the broken `OAEP` setting were encrypted with PKCS#1 v1.5. The fix makes `OAEP` use actual OAEP padding, so those values will fail to decrypt after upgrading. Re-encrypt all affected `{cipher}` values after upgrading.","state":0,"publishedAt":"2026-07-02T20:32:21+00:00","modifiedAt":"2026-07-02T20:56:33.199322+00:00","affected":[{"ecosystem":"NuGet","name":"Steeltoe.Configuration.Encryption","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"4.0.0"},{"kind":"fixed","version":"4.2.0"}]}],"versions":["4.0.0","4.1.0"],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-4j9m-h44m-2hv8","https://nvd.nist.gov/vuln/detail/CVE-2026-50268","https://github.com/SteeltoeOSS/Steeltoe/commit/6cfee5cccddf8f9a31de69b0ca5ccdd771b73e5b","https://github.com/SteeltoeOSS/security-advisories"],"sourceUrl":"https://github.com/advisories/GHSA-4j9m-h44m-2hv8","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4j9m-h44m-2hv8","identifiers":["GHSA-4j9m-h44m-2hv8","CVE-2026-50268"]},"retained":false,"historicalAffected":[]}],"coverage":[]}