---
id: CVE-2026-41678
title: rust-openssl provides OpenSSL bindings for the Rust programming language
summary: >-
  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
  intende…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-787
vendor: rust-openssl_project
product: rust-openssl
affected:
  - 'rust-openssl >= 0.10.24, < 0.10.78'
patched:
  - rust-openssl 0.10.78
published: '2026-04-24'
updated: '2026-07-17'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-41678'
references:
  - url: >-
      https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-8c75-8mhr-p7r9
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00446
epssPercentile: 0.36135
ingestedAt: '2026-07-17T20:15:42.656Z'
---

## Overview

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

- `rust-openssl >= 0.10.24, < 0.10.78`

## Remediation

Upgrade past the affected range:

- `rust-openssl 0.10.78`