---
title: "CVE-2026-86039: libp2p @libp2p/peer-store - Broken Access Control"
description: "libp2p @libp2p/peer-store 8.0.0 to 12.0.24 contains a broken access control caused by improper verification of PeerRecord.peerId in RecordEnvelope signatures, letting attackers poison address records, exploit requires attacker to sign records with their own key."
url: https://panop.io/threat-heartbeat/CVE-2026-86039/
---

# CVE-2026-86039 libp2p @libp2p/peer-store - Broken Access Control

libp2p @libp2p/peer-store 8.0.0 to 12.0.24 contains a broken access control caused by improper verification of PeerRecord.peerId in RecordEnvelope signatures, letting attackers poison address records, exploit requires attacker to sign records with their own key.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.27% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-86039)

## Details

Type

Broken Access Control

Impact

Broken Access Control

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Published

17 September 2026

Updated

15 October 2026

Weakness

[CWE-290](https://cwe.mitre.org/data/definitions/290.html)

## Vendor fix

Update to version 12.0.24 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-86039](https://nvd.nist.gov/vuln/detail/CVE-2026-86039)
- [https://github.com/libp2p/js-libp2p/commit/3bf5d395cbca1488eea6e87cd771e4613b661c30](https://github.com/libp2p/js-libp2p/commit/3bf5d395cbca1488eea6e87cd771e4613b661c30)
- [https://github.com/libp2p/js-libp2p/pull/3570](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/releases/tag/peer-store-v12.0.24)
- [https://github.com/libp2p/js-libp2p/security/advisories/GHSA-vrf4-mx87-p53w](https://github.com/libp2p/js-libp2p/security/advisories/GHSA-vrf4-mx87-p53w)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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