User Impersonation Affecting @libp2p/peer-store package, versions >=8.0.0 <12.0.24
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-LIBP2PPEERSTORE-20044965
- published22 Sept 2026
- disclosed17 Sept 2026
- creditAlleysira
Introduced: 17 Sep 2026
NewCVE-2026-86039 (opens in a new tab)How to fix?
Upgrade @libp2p/peer-store to version 12.0.24 or higher.
Overview
@libp2p/peer-store is a Stores information about peers libp2p knows on the network
Affected versions of this package are vulnerable to User Impersonation via consumePeerRecord in peer-store/src/index.ts, where the peer ID derived from the envelope's signing public key is compared against sequence numbers but addresses are stored under the peer ID taken from the record payload. Because the two peer IDs are never checked for equality, an attacker can supply a peer record whose payload peer ID differs from the signing key's peer ID, causing addresses to be written under an arbitrary peer ID and overwriting legitimate address records for that peer.