High severity · published Jun 10, 2026
CVE-2026-45783
libp2p: Unvalidated PUT_VALUE records allow unbounded disk exhaustion on DHT server nodes
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JS
js-libp2p · libp2p
< 16.2.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45783
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45783
github.com
https://github.com/libp2p/js-libp2p/security/advisories/GHSA-32mq-hpph-xfvr
More from js-libp2p
8.2
CVE-2026-86039
libp2p: PeerStore accepts attacker-signed PeerRecords for a victim peer ID and stores certified attacker addresses
7.5
CVE-2026-103936
libp2p: Single pre-auth STUN packet terminates `@libp2p/webrtc` WebRTC-direct Node.js listeners
7.5
CVE-2026-86040
libp2p: Unbounded RPC decode + synchronous subscription processing in @libp2p/floodsub allows unauthenticated DoS
7.5
CVE-2026-86038
libp2p: Gossipsub StrictSign accepts attacker-signed messages as a victim RSA peer ID
7.5
CVE-2026-77384
libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion