CVE-2026-41681 rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check
Attackers can trigger stack corruption via buffer overflow in digest_final, potentially leading to code execution or crashes in Rust applications using rust-openssl.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41681?
CVE-2026-41681 is a high-severity memory corruption vulnerability in rust-openssl, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.39 to before 0.10.78, EVP_DigestFinal() always writes EVP_MD_CTX_size(ctx) to the out buffer. If out is smaller than that, MdCtxRef::digest_final() writes past its end, usually corrupting the stack. This is reachable from safe Rust. This vulnerability is fixed in 0.10.78.
Weakness: CWE-121
Which versions are affected by CVE-2026-41681?
2 open source packages ship an affected version, including openssl. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
openssl crates.io | From 0.10.39 | 0.10.78 |
openssl crates.io | From 0.10.39 | 0.10.78 |
Products include Rust-Openssl Project Rust-Openssl.
How do I fix CVE-2026-41681?
Upgrade openssl to 0.10.78 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-41681 being exploited?
There is no known exploitation of CVE-2026-41681 in the wild and no public exploit code.
Other vulnerabilities in rust-openssl
- CVE-2018-20997 Use after free in openssl
- CVE-2026-41898 rust-openssl: Unchecked callback length in PSK/cookie trampolines leaks adjacent memory to peer
- CVE-2016-10931 Improper Certificate Validation in openssl
- CVE-2026-41676 rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1
- CVE-2026-41678 rust-openssl: Incorrect bounds assertion in aes key wrap
Sources
Also known as AZL-83624, DEBIAN-CVE-2026-41681, GHSA-ghm9-cr32-g9qj, MINI-3vcv-5364-gfg5, MINI-4649-5mpw-6f4q, MINI-5h45-h27x-wp6r and 6 more.