CVE-2026-45783 libp2p: Unvalidated PUT_VALUE records allow unbounded disk exhaustion on DHT server nodes
Remote attackers can exhaust disk space on libp2p DHT server nodes by sending unvalidated PUT_VALUE messages, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45783?
CVE-2026-45783 is a high-severity denial of service vulnerability in js-libp2p, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
libp2p is a JavaScript Implementation of libp2p networking stack. Prior to version 16.2.6, an unauthenticated remote peer can exhaust the disk storage of any @libp2p/kad-dht node running in server mode by sending an unbounded stream of PUT_VALUE messages whose keys bypass all content validation. No credentials, no prior relationship, and no protocol deviation beyond a crafted key are required. The victim node's datastore fills until the host disk is exhausted, making the node unavailable. This issue has been patched in version 16.2.6.
Which versions are affected by CVE-2026-45783?
2 open source packages ship an affected version, including @libp2p/kad-dht.
| Package | Affected | Fixed in |
|---|---|---|
@libp2p/kad-dht npm | All versions | 16.2.6 |
@libp2p/kad-dht npm | All versions | 16.2.6 |
How do I fix CVE-2026-45783?
Upgrade @libp2p/kad-dht to 16.2.6 or later.
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-2026-45783 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45783 exists.
Sources
Also known as GHSA-32mq-hpph-xfvr.