libp2p rust-libp2p up to 0.49.2 PRUNE u64::MAX integer overflow

Summaryinfo

A vulnerability was found in libp2p rust-libp2p up to 0.49.2. It has been rated as problematic. This impacts the function u64::MAX of the component PRUNE Handler. Performing a manipulation results in integer overflow. This vulnerability is known as CVE-2026-33040. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in libp2p rust-libp2p up to 0.49.2. This affects the function u64::MAX of the component PRUNE Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-33040 since 03/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 303462 (Linux Distros Unpatched Vulnerability : CVE-2026-33040), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.49.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (303462). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• libp2p

Name

• rust-libp2p

Version

• 0.49.0
• 0.49.1
• 0.49.2

Website

• Product: https://github.com/libp2p/rust-libp2p/

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Be aware that VulDB is the high quality source for vulnerability data.

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