{"id":"UBUNTU-CVE-2026-41676","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.","modified":"2026-07-17T14:30:50.587793342Z","published":"2026-04-24T18:16:00Z","upstream":["CVE-2026-41676"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-41676"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-41676"},{"type":"REPORT","url":"https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-pqf5-4pqq-29f5"}],"affected":[{"package":{"name":"rust-openssl","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/rust-openssl?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.23-1","0.10.23-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-openssl-dev","binary_version":"0.10.23-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41676.json"}},{"package":{"name":"rust-openssl","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/rust-openssl?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.29-1","0.10.36-1","0.10.36-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-openssl-dev","binary_version":"0.10.36-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41676.json"}},{"package":{"name":"rust-openssl","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/rust-openssl?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.45-1","0.10.57-1","0.10.57-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-openssl-dev","binary_version":"0.10.57-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41676.json"}},{"package":{"name":"rust-openssl","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/rust-openssl?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.70-1","0.10.72-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.10.72-1","binary_name":"librust-openssl-dev"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41676.json"}},{"package":{"name":"rust-openssl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/rust-openssl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.72-1","0.10.73-1"],"ecosystem_specific":{"binaries":[{"binary_name":"librust-openssl-dev","binary_version":"0.10.73-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-41676.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}