# CVE-2026-41676

> Vulnerability · severity: **CRITICAL** (CVSS 9.8).

## 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.

## Key facts

- **CVE ID:** CVE-2026-41676
- **Published:** 2026-04-24
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.8
- **CWE codes:** CWE-131, CWE-787

## Affected products

- `rust-openssl_project:rust-openssl`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41676

## Citation

> AI Analytics. CVE-2026-41676. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-41676. Derived from NIST NVD. Licensed CC0.

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