CVE-2026-95859Network attack vectorHinoki check available

Denial of service via unchecked GRAFT topic retention

Published Oct 16, 2026 · Updated Oct 16, 2026

Memory exhaustion in rust-libp2p Gossipsub before 0.49.5 allows remote attackers to interrupt service via crafted GRAFT messages. The GRAFT handler inserts untrusted topic hashes into connected_peer.topics without checking prior subscriptions, retaining new entries across messages. Exploitation requires an unauthenticated connection to a Gossipsub listener; cumulative growth bypasses subscription filters and message-size limits, exhausting process memory without a disclosed specific termination mode.

CVSS severity8.7
High
EPSS probability0.29%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Memory exhaustion in rust-libp2p Gossipsub before 0.49.5 allows remote attackers to interrupt service via crafted GRAFT messages. The GRAFT handler inserts untrusted topic hashes into connected_peer.topics without checking prior subscriptions, retaining new entries across messages. Exploitation requires an unauthenticated connection to a Gossipsub listener; cumulative growth bypasses subscription filters and message-size limits, exhausting process memory without a disclosed specific termination mode.

The record

CVE
CVE-2026-95859
Published
Oct 16, 2026
Updated
Oct 16, 2026
Vendor
libp2p
Product
rust-libp2p
Classifications
CWE-770, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.49.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

libp2p · rust-libp2pversion=< 0.49.5

Published CVSS scores

8.7GitHub CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started