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TI-2026-27541 Aliases CVE-2026-35405GHSA-cqfx-gf56-8x59

libp2p-rendezvous: Unlimited namespace registrations per peer enables OOM DoS on rendezvous servers

Priority HIGH 72CWE-770Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to 0.17.1, libp2p-rendezvous server has no limit on how many namespaces a single peer can register. A malicious peer can just keep registering unique namespaces in a loop and the server happily accepts every single one allocating memory for each registration with no pushback. Keep doing this long enough (or with multiple sybil peers) and the server process gets OOM killed. This vulnerability is fixed in 0.17.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0041 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed rust-libp2p (libp2p): 0.17.1libp2p-rendezvous (crates.io): 0.17.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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 0.17.10.17.1Patch availableCNA
—libp2p-rendezvous (crates.io)before 0.17.10.17.1Patch availableGHSA-cqfx-gf56-8x59
  • rust-libp2p Vendorlibp2p Affected before 0.17.1 Fixed in 0.17.1 Patch available CNA
  • libp2p-rendezvous (crates.io) Vendor— Affected before 0.17.1 Fixed in 0.17.1 Patch available GHSA-cqfx-gf56-8x59

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:protocol:libp2p:*:*:*:*:*:rust:*:*before 0.17.1VulnerableProtocol
  • cpe:2.3:a:protocol:libp2p:*:*:*:*:*:rust:*:* Versions before 0.17.1 Vulnerable ·Protocol

Remediation

  • Fix · CNA rust-libp2p (libp2p) Fixed in 0.17.1
  • Fix · GHSA-cqfx-gf56-8x59 libp2p-rendezvous (crates.io) Fixed in 0.17.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-35405
  2. 2026-10-03 Alias added: GHSA-cqfx-gf56-8x59

References

Exploit 1

Advisory 1

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