What is CVE-2026-41676?

CVE-2026-41676 is a critical-severity vulnerability in Rust-openssl, classified under Incorrect Calculation of Buffer Size. CVSS score: 9.8/10. Published 2026-04-24.

How severe is CVE-2026-41676?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Rust-openssl

CVE-2026-41676

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVP_PKEY_derive, relying on OpenS…

EPSS: 0.001 (20.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Rust-openssl — versions >= 0.9.27, < 0.10.78
Rust-openssl_project Rust-openssl

Weakness classification (CWE)

References

https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-pqf5-4pqq-29f5 (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-41676?: CVE-2026-41676 is a critical-severity vulnerability in Rust-openssl, classified under Incorrect Calculation of Buffer Size. CVSS score: 9.8/10. Published 2026-04-24.
How severe is CVE-2026-41676?: Critical severity. CVSS v3 base score is 9.8 out of 10.