High severity · published Apr 24, 2026
CVE-2026-41681
rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RU
rust-openssl · rust-openssl
>= 0.10.39, < 0.10.78 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41681
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41681
Patch
https://github.com/rust-openssl/rust-openssl/commit/826c3888b77add418b394770e2b2e3a72d9f92fe
Issue Tracking
https://github.com/rust-openssl/rust-openssl/pull/2608
Release Notes
https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78
Vendor Advisory
https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-ghm9-cr32-g9qj
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