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unbound

NLnet Labs Unbound versions 1.15.0 through 1.25.1 contain a vulnerability in the handling of TLS server names for DNS-over-TLS (DoT) forwarded queries. A use-after-free condition can occur during the DoT TCP handshake if the owning struct is removed prematurely, leading to a daemon crash and denial of service. Exploitation requires a specific configuration with a stub/forward zone using DoT and an '#authname' suffix, as well as precise timing of transient connection failures.

In NLnet Labs Unbound versions 1.15.0 up to and including 1.25.1, the TLS server name used for DNS-over-TLS forwarded queries is tied to the lifetime of a 'serviced_query' struct but also referenced by a 'waiting_tcp' struct. If the 'serviced_query' struct is removed while the DoT TCP stream is still handshaking, the storage for the TLS server name string is freed. If the TLS stream then encounters an error, it dereferences this freed pointer in a read-only manner, causing the Unbound daemon to crash. This results in a denial of service. Exploitation requires a DoT forwarding or stub configuration with an '#authname' suffix and transient connection failures timed to trigger the vulnerable error path.

NLnet Labs Unbound versions 1.15.0 through 1.25.1 contain a vulnerability in the handling of TLS server names for DNS-over-TLS (DoT) forwarded queries. A use-after-free condition can occur during the DoT TCP handshake if the owning struct is removed prematurely, leading to a daemon crash and denial 

In NLnet Labs Unbound 1.15.0 up to and including 1.25.1, the TLS server name used for DNS-over-TLS (DoT) forwarded queries is tied to a struct's… (CVE-2026-50046)

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