SB20260424129 - Fedora 43 update for openvpn
Published: April 24, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Race condition (CVE-ID: CVE-2026-40215)
The vulnerability allows a remote attacker to disclose packet data from a previous handshake.
The vulnerability exists due to a race condition in the TLS handshake handling when processing reconnecting sessions. A remote attacker can trigger repeated handshake activity to disclose packet data from a previous handshake.
This occurs only under specific circumstances involving replacement of an old TLS session by a new session while stale session state still attempts to send a packet.
2) Input validation error (CVE-ID: CVE-2026-35058)
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper input validation in tls_crypt_v2_extract_client_key and tls_crypt_unwrap when processing a malformed control channel packet. A remote user can send a specially crafted packet to cause a denial of service.
Only setups using tls-crypt-v2 are vulnerable. Exploitation requires possession of a valid tls-crypt-v2 client key, or observation of a handshake using a key with a specific byte property, or injection into a live client session.
Remediation
Install update from vendor's website.