Is CVE-2026-49866 actively exploited?

No active exploitation of CVE-2026-49866 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-49866 be exploited remotely?

Yes. CVE-2026-49866 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-49866?

CVE-2026-49866 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-49866

HIGH

CVE-2026-49866

CWE-770Published: July 8, 2026· Updated: Jul 10, 2026

7.5

CVSS v3.1

EPSS:0.45%probability of exploitation in 30 daysPercentile:35.9th

Official Description

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 arrays in message/decodeRpc.ts and gossipsub.ts to synchronously iterate roughly 180,000 message IDs per 4 MB frame and block the Node.js event loop. This issue is fixed in version 16.0.0.

NVD Source

Technical Analysis

CVE-2026-49866 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.