CVE-2026-41678 — rust-openssl: Incorrect bounds assertion in aes key wrap

Affected: rust-openssl

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.

GHSA-8c75-8mhr-p7r9 — rust-openssl has incorrect bounds assertion in aes key wrap

Affected: crates.io: openssl

### Summary ``aes::unwrap_key()`` has an incorrect bounds assertion on the out buffer size, which can lead to out-of-bounds write.

### Details ``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.

### Impact Vulnerable applications using AES keywrap and allowing attacker controlled buffer sizes could have an attacker trigger an out-of-bounds write.

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CVE-2026-41678 — rust-openssl: Incorrect bounds assertion in aes key wrap

GHSA-8c75-8mhr-p7r9 — rust-openssl has incorrect bounds assertion in aes key wrap