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TI-2026-26514 Aliases CVE-2026-34219GHSA-xqmp-fxgv-xvq5

libp2p-gossipsub: Gossipsub PRUNE Backoff Heartbeat Instant Overflow

Priority LOW 36CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-190 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00583 48th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed rust-libp2p (libp2p): 0.49.4libp2p-gossipsub (crates.io): 0.49.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
libp2prust-libp2pbefore 0.49.40.49.4Patch availableCNA
—libp2p-gossipsub (crates.io)before 0.49.40.49.4Patch availableGHSA-xqmp-fxgv-xvq5
  • rust-libp2p Vendorlibp2p Affected before 0.49.4 Fixed in 0.49.4 Patch available CNA
  • libp2p-gossipsub (crates.io) Vendor— Affected before 0.49.4 Fixed in 0.49.4 Patch available GHSA-xqmp-fxgv-xvq5

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:protocol:libp2p-gossipsub:*:*:*:*:*:rust:*:*before 0.49.4VulnerableProtocol
  • cpe:2.3:a:protocol:libp2p-gossipsub:*:*:*:*:*:rust:*:* Versions before 0.49.4 Vulnerable ·Protocol

Remediation

  • Fix · CNA rust-libp2p (libp2p) Fixed in 0.49.4
  • Fix · GHSA-xqmp-fxgv-xvq5 libp2p-gossipsub (crates.io) Fixed in 0.49.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34219
  2. 2026-10-03 Alias added: GHSA-xqmp-fxgv-xvq5

References

Exploit 1

Advisory 2

Other 1

  • TI-2026-60386 libp2p-rendezvous through 0.17.1 Denial of Service via Unbounded Registration TTL in Discovery Responses CVSS 4.0HIGH 8.7
  • TI-2026-58865 libp2p: PeerStore accepts attacker-signed PeerRecords for a victim peer ID and stores certified attacker addresses CVSS 3.1HIGH 8.2
  • TI-2026-44102 libp2p-quic: Remote panic via certificate expiry race during QUIC handshake CVSS 4.0HIGH 8.2
  • TI-2026-27587 libp2p-rust has unbounded rendezvous DISCOVER cookies enable remote memory exhaustion CVSS 3.1HIGH 8.2
  • TI-2026-58864 libp2p: Gossipsub StrictSign accepts attacker-signed messages as a victim RSA peer ID CVSS 3.1HIGH 7.5
  • TI-2026-53982 libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion CVSS 3.1HIGH 7.5
See all 26 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences