flightctl HTTP listener TLS handshake DoS via sync callback
CVE-2026-120399 Published on November 10, 2026
Flightctl-api: flightctl-remote-access: flightctl: unbounded tls handshake in conncontext can block accepting connections
A flaw was found in flightctl. A TLS handshake is performed synchronously in the HTTP servers connection-context callback without a deadline. A network-reachable unauthenticated client can stall the handshake and prevent the affected listener from accepting new connections.
Vulnerability Analysis
CVE-2026-120399 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Timeline
Reported to Red Hat.
Made public. 8 days later.
Weakness Type
Use of Blocking Code in Single-threaded, Non-blocking Context
The product uses a non-blocking model that relies on a single threaded process for features such as scalability, but it contains code that can block when it is invoked.
Products Associated with CVE-2026-120399
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