high7.5
CVE-2026-41676
rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | openssl | >= 0.9.27, < 0.10.78 | 0.10.78 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Rust-Openssl Project | Rust-Openssl | from 0.9.27 before 0.10.78 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-pqf5-4pqq-29f5
- https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-pqf5-4pqq-29f5
- https://github.com/rust-openssl/rust-openssl/pull/2606
- https://github.com/rust-openssl/rust-openssl/commit/09b425e5f59a2466d806e71a83a9a449c914c596
- https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78
- https://nvd.nist.gov/vuln/detail/CVE-2026-41676