CVE-2026-41676: Rust-OpenSSL Project Rust-OpenSSL

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Rust-OpenSSL Project Rust-OpenSSL: from 0.9.27, before 0.10.78 (fixed in 0.10.78)

Published 2026-04-24. Last modified 2026-07-15.