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 ↗

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

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

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