Resource exhaustion in Libp2p Js-libp2p
CVE-2026-49866
libp2p is a JavaScript Implementation of libp2p networking stack. Prior to 16.0.0, @libp2p/gossipsub defaultDecodeRpcLimits set maxIhaveMessageIDs and maxIwantMessageIDs to Infinity, allowing oversized IHAVE and IWANT control message array…
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Libp2p Js-libp2p — versions < 16.0.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-49866?
- CVE-2026-49866 is a high-severity vulnerability in Libp2p Js-libp2p, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-07-08.
- How severe is CVE-2026-49866?
- High severity. CVSS v3 base score is 7.5 out of 10.