Verified

osv:RUSTSEC-2026-0349: rustls (exact versions not specified)

Unauthenticated ServerHello can downgrade later connections to classical key exchange. Fixed version: 0.23.46.

Affected technology

rustls · Exact affected versions not specified by the source
Vendor not specified by the source

Component: Not specified by the source

Attack conditions (OSV, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

A network attacker can answer one connection attempt with a ServerHello selecting X25519, and then close the connection. OSV’s CVSS 3.1 assessment rates confidentiality impact as low; integrity and availability impact as none.

Published 15-Oct-2026 00:54 UTC

Product: rustls
KEV: no

Provenance

OSV.dev · Source record · observed 2026-10-14 16:28:58.499616+00:00 UTC

Stable permalink: https://cybercodered.org/item/adv-osv-rustsec-2026-0349.html