libp2p: PeerStore accepts attacker-signed PeerRecords for a victim peer ID and stores certified attacker addresses (CVE-2026-86039) | HOL Guard CVE

High · CVSS 8.2CVE-2026-86039GHSA-VRF4-MX87-P53W

libp2p: PeerStore accepts attacker-signed PeerRecords for a victim peer ID and stores certified attacker addresses

Answer in brief

CVE-2026-86039 records a High severity (CVSS 8.2) vulnerability in libp2p: PeerStore accepts attacker-signed PeerRecords for a victim peer ID and stores certified attacker addresses. The current sources do not mark it as known exploited. The current feed maps libp2p/js-libp2p (generic), @libp2p/peer-store (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.2
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps libp2p/js-libp2p (generic), @libp2p/peer-store (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
libp2p/js-libp2pgeneric	>= 8.0.0, < 12.0.24	Not reported
@libp2p/peer-storenpm	>=8.0.0,<12.0.24	12.0.24

Recommended response

Check inventory. Check lockfiles and deployed manifests for libp2p/js-libp2p, @libp2p/peer-store.
Review the reported fix. Update @libp2p/peer-store to 12.0.24 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.