libp2p up to 12.0.23 Peer Store index.ts consumePeerRecord authentication spoofing

Summaryinfo

A vulnerability was found in libp2p up to 12.0.23. It has been declared as critical. Impacted is the function consumePeerRecord of the file packages/peer-store/src/index.ts of the component Peer Store. Executing a manipulation can lead to authentication spoofing. This vulnerability is registered as CVE-2026-86039. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in libp2p up to 12.0.23. It has been declared as critical. This vulnerability affects the function consumePeerRecord of the file packages/peer-store/src/index.ts of the component Peer Store. The manipulation with an unknown input leads to a authentication spoofing vulnerability. The CWE definition for the vulnerability is CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. As an impact it is known to affect integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-86039 since 09/04/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 12.0.24 eliminates this vulnerability.

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Productinfo

Name

• libp2p

Version

• 12.0.0
• 12.0.1
• 12.0.2
• 12.0.3
• 12.0.4
• 12.0.5
• 12.0.6
• 12.0.7
• 12.0.8
• 12.0.9
• 12.0.10
• 12.0.11
• 12.0.12
• 12.0.13
• 12.0.14
• 12.0.15
• 12.0.16
• 12.0.17
• 12.0.18
• 12.0.19
• 12.0.20
• 12.0.21
• 12.0.22
• 12.0.23

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