CVE-2026-41681 PUBLISHED

rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check

Assigner: GitHub_M
Reserved: 22.04.2026 Published: 24.04.2026 Updated: 24.04.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
CVSS Score: 8.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	rust-openssl
Product	rust-openssl
Versions	Version >= 0.10.39, < 0.10.78 is affected

References

Problem Types

CWE-121: Stack-based Buffer Overflow CWE