rust-openssl CVE-2026-41676
HIGH
GHSA-pqf5-4pqq-29f5
CVSS VectorNVD
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
6DescriptionNVD
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.
AnalysisAI
Memory corruption in rust-openssl's key derivation functions allows heap or stack buffer overflow when applications pass undersized buffers to Deriver::derive or PkeyCtxRef::derive on OpenSSL 1.1.x. The vulnerability affects X25519, X448, DH, and HKDF-extract operations where OpenSSL ignores the caller-specified buffer length and unconditionally writes the full shared secret, causing safe Rust code to trigger memory corruption. …
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RemediationAI
Within 24 hours: Inventory all applications and dependencies using rust-openssl and identify OpenSSL 1.1.x deployments. Within 7 days: Upgrade rust-openssl to version 0.10.78 or later across all affected systems and recompile dependent applications. …
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External POC / Exploit Code
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