CVE-2026-41676
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.
How to fix
- rust-openssl_project rust-openssl0.10.78 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| rust-openssl_project rust-openssl | 0.9.27 ≤ v < 0.10.78 | 0.10.78 |
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