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TI-2026-25486 Aliases CVE-2026-33040GHSA-gc42-3jg7-rxr2

libp2p-rust: Gossipsub PRUNE.backoff Duration Overflow

Priority MEDIUM 45CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
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. 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00602 49th percentileScored 2026-11-07
Fix Fixed rust-libp2p (libp2p): 0.49.3libp2p-gossipsub (crates.io): 0.49.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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 0.49.30.49.3Patch availableCNA
—libp2p-gossipsub (crates.io)before 0.49.30.49.3Patch availableGHSA-gc42-3jg7-rxr2
  • rust-libp2p Vendorlibp2p Affected before 0.49.3 Fixed in 0.49.3 Patch available CNA
  • libp2p-gossipsub (crates.io) Vendor— Affected before 0.49.3 Fixed in 0.49.3 Patch available GHSA-gc42-3jg7-rxr2

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:protocol:libp2p-gossipsub:*:*:*:*:*:rust:*:*before 0.49.3VulnerableProtocol
  • cpe:2.3:a:protocol:libp2p-gossipsub:*:*:*:*:*:rust:*:* Versions before 0.49.3 Vulnerable ·Protocol

Remediation

  • Fix · CNA rust-libp2p (libp2p) Fixed in 0.49.3
  • Fix · GHSA-gc42-3jg7-rxr2 libp2p-gossipsub (crates.io) Fixed in 0.49.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33040
  2. 2026-10-03 Alias added: GHSA-gc42-3jg7-rxr2

References

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