CVE-2026-41678: Rust-OpenSSL Project Rust-OpenSSL

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

rust-openssl provides OpenSSL bindings for the Rust programming language. From to before 0.10.78, aes::unwrap_key() contains an incorrect assertion: it checks that out.len() + 8 <= in_.len(), but this condition is reversed. The intended invariant is out.len() >= in_.len() - 8, ensuring the output buffer is large enough. Because of the inverted check, the function only accepts buffers at or below the minimum required size and rejects larger ones. If a smaller buffer is provided the function will write past the end of out by in_.len() - 8 - out.len() bytes, causing an out-of-bounds write from a safe public function. This vulnerability is fixed in 0.10.78.

Affected products

• Rust-OpenSSL Project Rust-OpenSSL: from 0.10.24, before 0.10.78 (fixed in 0.10.78)

Published 2026-04-24. Last modified 2026-07-17.