CVE-2026-44505 Nimiq network-libp2p: Untrusted peer can wedge DHT
An untrusted peer can cause indefinite hangs in DHT queries by triggering verifier errors, leading to denial of service in Nimiq network-libp2p.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-44505?
CVE-2026-44505 is a medium-severity denial of service vulnerability in nimiq core-rs-albatross, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. network-libp2p handles kad get-record query progress in handle_dht_get (network-libp2p/src/swarm.rs). Prior to version 1.4.0, when a peer returns a FoundRecord, the code verifies the record via dht_verifier.verify(&record.record). On verifier error, handle_dht_get logs and returns early without completing the oneshot used by Network::dht_get, and without cleaning up per-query bookkeeping. Later query progress can hit the "DHT inconsistent state" path and also return without cleanup. Because Network::dht_get awaits the oneshot without a timeout, the caller future can hang indefinitely. This issue has been patched in version 1.4.0.
Weakness: CWE-755
Which versions are affected by CVE-2026-44505?
How do I fix CVE-2026-44505?
No fix has been published for CVE-2026-44505 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-44505 being exploited?
There is no known exploitation of CVE-2026-44505 in the wild and no public exploit code.
Sources
Also known as GHSA-g39c-jcgg-qwvr.