{"id":"CVE-2026-41676","state":"PUBLISHED","title":"rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1","description":"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.","publishedAt":"2026-04-24T17:16:20.539Z","updatedAt":"2026-04-24T17:43:20.693Z","severity":{"score":7.2,"label":"High","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["rust-openssl rust-openssl"],"affected":[{"vendor":"rust-openssl","product":"rust-openssl","versions":[{"version":">= 0.9.27, < 0.10.78","status":"affected"}]}],"references":["https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-pqf5-4pqq-29f5"],"weaknesses":["CWE-787","CWE-131"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/41xxx/CVE-2026-41676.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-41676","state":"PUBLISHED","datePublished":"2026-04-24T17:16:20.539Z","dateUpdated":"2026-04-24T17:43:20.693Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-22T03:53:24.406Z"},"containers":{"cna":{"title":"rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"rust-openssl","product":"rust-openssl","versions":[{"version":">= 0.9.27, < 0.10.78","status":"affected"}]}],"references":[{"url":"https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-pqf5-4pqq-29f5","name":"https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-pqf5-4pqq-29f5","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787: Out-of-bounds Write","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-131","lang":"en","description":"CWE-131: Incorrect Calculation of Buffer Size","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-24T17:16:20.539Z"},"source":{"advisory":"GHSA-pqf5-4pqq-29f5","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-24T17:43:14.622885Z","id":"CVE-2026-41676","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-24T17:43:20.693Z"}}]}}}