Buffer overflow in Rust-Openssl
CVE-2026-41681
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (27.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Rust-Openssl — versions >= 0.10.39, < 0.10.78
- Rust-Openssl Project
Weakness classification (CWE)
References
- github.com/rust-openssl/rust-openssl/security/advisories/GHSA-ghm9-cr32-g9qj (Vendor Advisory)
- github.com/rust-openssl/rust-openssl/pull/2608 (Issue Tracking)
- github.com/rust-openssl/rust-openssl/commit/826c3888b77add418b394770e2b2e3a72d9… (Patch)
- github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78 (Release Notes)
Frequently asked questions
- What is CVE-2026-41681?
- CVE-2026-41681 is a high-severity vulnerability in Rust-Openssl, classified under Stack-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-04-24.
- How severe is CVE-2026-41681?
- High severity. CVSS v3 base score is 7.5 out of 10.