{"id":"CVE-2026-41676","aliases":["GHSA-pqf5-4pqq-29f5"],"url":"https://o3.security/vulnerability/CVE-2026-41676","summary":"rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1","details":"rust-openssl provides OpenSSL bindings for the Rust programming language.  From 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVP_PKEY_derive, relying on OpenSSL to honor it. On OpenSSL 1.1.x, X25519, X448, DH and HKDF-extract ignore the incoming *keylen, unconditionally writing the full shared secret (32/56/prime-size bytes). A caller passing a short slice gets a heap/stack overflow from safe code. OpenSSL 3.x providers do check, so this only impacts older OpenSSL. This vulnerability is fixed in 0.10.78.","published":"2026-04-24T17:16:20.539Z","modified":"2026-09-17T18:26:47.442259688Z","cvss":null,"epss":{"score":0.00285,"percentile":0.20426,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"openssl","fixedVersion":"0.10.78"}],"fix":{"url":"https://github.com/rust-openssl/rust-openssl/pull/2606","label":"rust-openssl/rust-openssl#2606"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41676.json"},{"type":"ADVISORY","url":"https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-pqf5-4pqq-29f5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41676"},{"type":"WEB","url":"https://github.com/rust-openssl/rust-openssl/pull/2606"},{"type":"WEB","url":"https://github.com/rust-openssl/rust-openssl/commit/09b425e5f59a2466d806e71a83a9a449c914c596"},{"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":"2026-09-17T18:26:47.442259688Z"}}