CVE-2026-33040 - libp2p-rust: Gossipsub PRUNE.backoff Duration Overflow

CVE-2026-33040 - libp2p-rust: Gossipsub PRUNE.backoff Duration Overflow

https://cvefeed.io/rssfeed/latest.atom / Fri, 03/20/2026 - 08:07
CVE ID :CVE-2026-33040
Published : March 20, 2026, 6:16 a.m. | 45 minutes ago
Description :libp2p-rust is the official rust language Implementation of the libp2p networking stack. In versions prior to 0.49.3, the Gossipsub implementation accepts attacker-controlled PRUNE backoff values and may perform unchecked time arithmetic when storing backoff state. A specially crafted PRUNE control message with an extremely large backoff (e.g. u64::MAX) can lead to Duration/Instant overflow during backoff update logic, triggering a panic in the networking state machine. This is remotely reachable over a normal libp2p connection and does not require authentication. Any application exposing a libp2p Gossipsub listener and using the affected backoff-handling path can be crashed by a network attacker that can reach the service port. The attack can be repeated by reconnecting and replaying the crafted control message. This issue has been fixed in version 0.49.3.
Severity: 8.7 | HIGH
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