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RUSTSEC-2026-0231
No affected components available
The SDK forwarded every NIP-42 AUTH challenge received from a relay through an
unbounded command queue. Challenge handling can wait for an asynchronous signer or
user interaction, so receiving challenges was substantially faster than completing
the corresponding authentication work.
A malicious relay could continuously send new challenges without authenticating or delivering valid events. Every value remained queued, causing memory use and pending signer operations to grow without a fixed limit until the client became unavailable. The issue does not allow the relay to forge a signature or learn the client's private key.
The SDK now coalesces pending challenges through a latest-value channel. NIP-42 makes an earlier challenge invalid when the relay sends a new one, so replacing pending work preserves the only challenge that can still be answered while keeping memory use bounded.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the availability of the system.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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