Allocation of Resources Without Limits or Throttling Affecting @libp2p/gossipsub package, versions <15.0.23-d888f182f
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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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Start learning- Snyk IDSNYK-JS-LIBP2PGOSSIPSUB-17901717
- published9 Jul 2026
- disclosed8 Jul 2026
- creditTahaa Farooq
Introduced: 8 Jul 2026
NewCVE-2026-49866 (opens in a new tab)How to fix?
Upgrade @libp2p/gossipsub to version 15.0.23-d888f182f or higher.
Overview
@libp2p/gossipsub is an A typescript implementation of gossipsub
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the defaultDecodeRpcLimits in which maxIhaveMessageIDs and maxIwantMessageIDs are set to Infinity, allowing oversized IHAVE and IWANT control message arrays to be processed in message/decodeRpc.ts and gossipsub.ts. An attacker can exhaust CPU resources and block the Node.js event loop by sending large arrays of message IDs.