Vulnerability Description
libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to version 0.49.4, the Rust libp2p Gossipsub implementation contains a remotely reachable panic in backoff expiry handling. After a peer sends a crafted PRUNE control message with an attacker-controlled, near-maximum backoff value, the value is accepted and stored as an Instant near the representable upper bound. On a later heartbeat, the implementation performs unchecked Instant + Duration arithmetic (backoff_time + slack), which can overflow and panic with: overflow when adding duration to instant. This issue is reachable from any Gossipsub peer over normal TCP + Noise + mplex/yamux connectivity and requires no further authentication beyond becoming a protocol peer. This issue has been patched in version 0.49.4.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Protocol | Libp2P-Gossipsub | < 0.49.4 |
Related Weaknesses (CWE)
References
- https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-xqmp-fxgv-xvq5ExploitVendor Advisory
FAQ
What is CVE-2026-34219?
CVE-2026-34219 is a vulnerability with a CVSS score of 5.9 (MEDIUM). libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to version 0.49.4, the Rust libp2p Gossipsub implementation contains a remotely reachable panic in backof...
How severe is CVE-2026-34219?
CVE-2026-34219 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34219?
Check the references section above for vendor advisories and patch information. Affected products include: Protocol Libp2P-Gossipsub.