Reachable Assertion Affecting libp2p-gossipsub package, versions <0.49.4
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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- published30 Mar 2026
- disclosed30 Mar 2026
- creditUnknown
Introduced: 30 Mar 2026
CVE-2026-34219 (opens in a new tab)How to fix?
Upgrade libp2p-gossipsub to version 0.49.4 or higher.
Overview
Affected versions of this package are vulnerable to Reachable Assertion via the heartbeat process. An attacker can cause a remote crash by sending a crafted PRUNE control message with a near-maximum backoff value, which leads to unchecked arithmetic overflow during expiry handling.