What’s Vulnerable › Vulnerabilities

CVE-2026-41681: rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-24 · updated 2026-07-15
• Weakness: CWE-121

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.

Affected products

• rust-openssl: from 0.10.39 before 0.10.78 — fixed in 0.10.78

How to fix

Upgrade to a fixed version: rust-openssl 0.10.78. Check the vendor advisory for mitigations.

References

• https://github.com/rust-openssl/rust-openssl/commit/826c3888b77add418b394770e2b2e3a72d9f92fe
• https://github.com/rust-openssl/rust-openssl/pull/2608
• https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78
• https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-ghm9-cr32-g9qj

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