{"id":"CVE-2026-41678","aliases":["GHSA-8c75-8mhr-p7r9"],"url":"https://o3.security/vulnerability/CVE-2026-41678","summary":"rust-openssl: Incorrect bounds assertion in aes key wrap","details":"### Summary\n``aes::unwrap_key()`` has an incorrect bounds assertion on the out buffer size, which can lead to out-of-bounds write.\n\n### Details\n``aes::unwrap_key()`` contains an incorrect assertion: it checks that `out.len() + 8 <= in_.len()`, but this condition is reversed. The intended invariant is `out.len() >= in_.len() - 8`, ensuring the output buffer is large enough.\n\nBecause of the inverted check, the function only accepts buffers at or below the minimum required size and rejects larger ones. If a smaller buffer is provided the function will write past the end of `out` by `in_.len() - 8 - out.len()` bytes, causing an out-of-bounds write from a safe public function.\n\n### Impact\nVulnerable applications using AES keywrap and allowing attacker controlled buffer sizes could have an attacker trigger an out-of-bounds write.","published":"2026-04-24T17:18:27.280Z","modified":"2026-09-10T18:26:47.533967367Z","cvss":null,"epss":{"score":0.00251,"percentile":0.16728,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"openssl","fixedVersion":"0.10.78"}],"fix":{"url":"https://github.com/rust-openssl/rust-openssl/pull/2604","label":"rust-openssl/rust-openssl#2604"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41678.json"},{"type":"ADVISORY","url":"https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-8c75-8mhr-p7r9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41678"},{"type":"WEB","url":"https://github.com/rust-openssl/rust-openssl/pull/2604"},{"type":"WEB","url":"https://github.com/rust-openssl/rust-openssl/commit/718d07ff8ff7be417d5b7a6a0047f1607520b3b6"},{"type":"PACKAGE","url":"https://github.com/rust-openssl/rust-openssl"},{"type":"WEB","url":"https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T18:26:47.533967367Z"}}