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CVE-2026-41681

HIGH

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

Published April 22, 2026Updated May 5, 2026Source: osv

Summary

`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.

Remediation

Upgrade to the fixed version using your package manager.

Cargo
Update openssl to 0.10.78 or later
cargo update -p openssl --precise 0.10.78

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

PackageEcosystemAffectedFixed In
openssl
crates.io
All versions0.10.78

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2026-41681?
rust-openssl: rustMdCtxRef::digest_final() writes past caller buffer with no length check This vulnerability has been assigned a severity rating of HIGH (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-41681?
CVE-2026-41681 affects openssl. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-41681 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-ghm9-cr32-g9qj

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