Vulnerability Description
libp2p is a JavaScript implementation of the libp2p networking stack. From 8.0.0 until 12.0.24, @libp2p/peer-store in packages/peer-store/src/index.ts uses consumePeerRecord to verify a RecordEnvelope signature but does not require PeerRecord.peerId in the signed payload to equal the signer peer ID derived by RecordEnvelope.openAndCertify. The expectedPeer option checks only the envelope signer, and the gossipsub Peer Exchange path can provide the attacker's own peer ID as expectedPeer. An attacker can therefore sign a record with the attacker's key, place a victim peer ID and attacker-controlled multiaddrs in the payload, and have certified addresses stored for the victim. The poisoned addresses can cause address-book corruption, dial redirection or failure, routing manipulation, and reachability disruption, although the connection upgrade still verifies remote peer identity and prevents a complete identity takeover. The issue is fixed in version 12.0.24.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/libp2p/js-libp2p/commit/3bf5d395cbca1488eea6e87cd771e4613b661
- https://github.com/libp2p/js-libp2p/pull/3570
- https://github.com/libp2p/js-libp2p/releases/tag/peer-store-v12.0.24
- https://github.com/libp2p/js-libp2p/security/advisories/GHSA-vrf4-mx87-p53w
FAQ
What is CVE-2026-86039?
CVE-2026-86039 is a vulnerability with a CVSS score of 8.2 (HIGH). libp2p is a JavaScript implementation of the libp2p networking stack. From 8.0.0 until 12.0.24, @libp2p/peer-store in packages/peer-store/src/index.ts uses consumePeerRecord to verify a RecordEnvelope...
How severe is CVE-2026-86039?
CVE-2026-86039 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-86039?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.