CVE-2026-34219

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 v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-xqmp-fxgv-xvq5	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:libp2p:libp2p-gossipsub:*:*:*:*:*:rust:*:*

History

06 Apr 2026, 15:00

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.9
First Time		Libp2p libp2p-gossipsub Libp2p
References	~~() https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-xqmp-fxgv-xvq5 -~~	() https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-xqmp-fxgv-xvq5 - Exploit, Vendor Advisory
CPE		cpe:2.3:a:libp2p:libp2p-gossipsub::::::rust::*

31 Mar 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-31 16:16

Updated : 2026-04-06 15:00

NVD link : CVE-2026-34219

Mitre link : CVE-2026-34219

CVE.ORG link : CVE-2026-34219

JSON object : View

Products Affected

libp2p

libp2p-gossipsub

CWE

CWE-190

Integer Overflow or Wraparound

CWE-617

Reachable Assertion

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