Missing Release of Memory after Effective Lifetime Affecting @libp2p/floodsub package, versions <11.0.26
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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- published22 Sept 2026
- disclosed17 Sept 2026
- creditJace
Introduced: 17 Sep 2026
NewCVE-2026-86040 (opens in a new tab)How to fix?
Upgrade @libp2p/floodsub to version 11.0.26 or higher.
Overview
@libp2p/floodsub is a libp2p-floodsub, also known as pubsub-flood or just dumbsub, this implementation of pubsub focused on delivering an API for Publish/Subscribe, but with no CastTree Forming (it just floods the network).
Affected versions of this package are vulnerable to Missing Release of Memory after Effective Lifetime via the PeerStreams.attachInboundStream process. An attacker can exhaust CPU resources, cause memory exhaustion, and render the node unavailable by sending specially crafted unauthenticated RPC frames that decode into a large number of empty or unique-topic subscription entries, leading to event loop blocking and persistent memory growth.