Buffer overflow in Rust-Openssl
CVE-2026-41678
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (14.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Rust-Openssl — versions >= 0.10.24, < 0.10.78
- Rust-Openssl Project
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-41678?
- CVE-2026-41678 is a high-severity vulnerability in Rust-Openssl, classified under Out-of-bounds Write. CVSS score: 8.1/10. Published 2026-04-24.
- How severe is CVE-2026-41678?
- High severity. CVSS v3 base score is 8.1 out of 10.