OCTOBER 12, 2026
Live Feed
Back to database
Case File

CVE-2026-86039

HIGH · CVSS 8.2 EPSS 0.27% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-17 · Last synced 2026-10-12

CyberRota Analysis

AI-Generated

The vulnerability affects the @libp2p/peer-store component in versions 8.0.0 to 12.0.24, allowing an attacker to manipulate peer records by signing them with their own key while using a victim's peer ID. This can lead to address-book corruption, dial redirection, and routing manipulation, potentially disrupting connectivity without fully compromising the victim's identity. Organizations utilizing affected versions of Exchange or Java should prioritize patching to version 12.0.24 or later to mitigate these risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-86039
Severity
HIGH
CVSS
8.2
EPSS
0.27%
Exchange Java

Original NVD 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.