Improper Verification of Cryptographic Signature Affecting @libp2p/gossipsub package, versions >=15.0.0 <16.0.5
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-LIBP2PGOSSIPSUB-20044966
- published22 Sept 2026
- disclosed17 Sept 2026
- creditAlleysira
Introduced: 17 Sep 2026
NewCVE-2026-86038 (opens in a new tab)How to fix?
Upgrade @libp2p/gossipsub to version 16.0.5 or higher.
Overview
@libp2p/gossipsub is an A typescript implementation of gossipsub
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature in the validateToRawMessage process. An attacker can cause messages to be accepted and propagated as if authored by a victim by supplying a victim's RSA peer ID in msg.from, signing the message with the attacker's private key, and providing the attacker's public key in msg.key. This allows attacker-controlled data to be processed under false origin attribution, potentially impacting validators, authorization, accounting, moderation, reputation, or audit logging.