CVE-2026-41677: Rust-OpenSSL Project Rust-OpenSSL

Critical severity, CVSS 9.1. EPSS: 0.3% chance of exploitation in the next 30 days.

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.0 to before 0.10.78, the *_from_pem_callback APIs did not validate the length returned by the user's callback. A password callback that returns a value larger than the buffer it was given can cause some versions of OpenSSL to over-read this buffer. OpenSSL 3.x is not affected by this. This vulnerability is fixed in 0.10.78.

Affected products

• Rust-OpenSSL Project Rust-OpenSSL: from 0.9.0, before 0.10.78 (fixed in 0.10.78)

Published 2026-04-24. Last modified 2026-06-17.