# CVE-2026-41678

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

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-41678
- **Published:** 2026-04-24
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.8
- **CWE codes:** CWE-787

## Affected products

- `rust-openssl_project:rust-openssl`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41678

## Citation

> AI Analytics. CVE-2026-41678. Retrieved 2026-07-25 from https://api.ai-analytics.org/cve/CVE-2026-41678. Derived from NIST NVD. Licensed CC0.

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