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CVE-2016-10931

2026-10-02T22:17:55.291267+00:00

An issue was discovered in the openssl crate before 0.9.0 for Rust. There is an SSL/TLS man-in-the-middle vulnerability because certificate verification is off by default and there is no API for hostname verification.

GHSA-34p9-f4q3-c4r7 — Improper Certificate Validation in openssl

2026-10-02T22:17:55.291322+00:00

Affected: crates.io: openssl

All versions of rust-openssl prior to 0.9.0 contained numerous insecure defaults including off-by-default certificate verification and no API to perform hostname verification. Unless configured correctly by a developer, these defaults could allow an attacker to perform man-in-the-middle attacks. The problem was addressed in newer versions by enabling certificate verification by default and exposing APIs to perform hostname verification. Use the SslConnector and SslAcceptor types to take advantage of these new features (as opposed to the lower-level SslContext type).

RUSTSEC-2016-0002 — HTTPS MitM vulnerability due to lack of hostname verification

2026-10-02T22:17:55.291354+00:00

Affected: crates.io: hyper

When used on Windows platforms, all versions of Hyper prior to 0.9.4 did not perform hostname verification when making HTTPS requests.

This allows an attacker to perform MitM attacks by preventing any valid CA-issued certificate, even if there's a hostname mismatch.

The problem was addressed by leveraging rust-openssl's built-in support for hostname verification.