# CVE-2026-33040: Gossipsub PRUNE.backoff Duration Overflow

Source: https://junglewise.ai/threats/cve-2026-33040-gossipsub-prune-backoff-duration-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-18  
License: CC BY 4.0 with a link back

CVE-2026-33040 · Severity: medium · CVSS 4 · Published 2026-03-18

Gossipsub PRUNE.backoff Duration Overflow

Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is CVE-2026-33040 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33040 being exploited in the wild.

**How severe is CVE-2026-33040?** Medium severity, with a CVSS score of 4, published 18 March 2026.

**Which products and versions are affected?** libp2p-gossipsub (crates.io) SEMVER:introduced=0,fixed=0.49.3.

**Is there a fix for CVE-2026-33040?** Yes. libp2p-gossipsub (crates.io): upgrade to 0.49.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-33040?** Check whether you run libp2p-gossipsub (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- libp2p-gossipsub (crates.io): upgrade to 0.49.3 or later

  ```sh
  cargo update -p libp2p-gossipsub
  ```


## Affected products

- libp2p-gossipsub (crates.io) SEMVER:introduced=0,fixed=0.49.3

## Identifiers

- CVE-2026-33040
- GHSA-gc42-3jg7-rxr2

## Related threats

- [libp2p rust-libp2p denial of service in Gossipsub heartbeat](https://junglewise.ai/threats/cve-2026-34219-libp2p-rust-libp2p-denial-of-service-in-gossipsub-heartbeat)