Denial of Service Vulnerability in libp2p Rust Implementation Affecting Gossipsub
CVE-2026-95859

8.7HIGH

Key Information:

Vendor

Libp2p

Status
Rust-libp2p
Vendor
CVE Published:
16 October 2026

What is CVE-2026-95859?

The libp2p-rust networking stack prior to version 0.49.5 contains a vulnerability in the Gossipsub protocol that allows an unauthenticated remote peer to exploit GRAFT control-message handling. The vulnerability enables the attacker to send novel topic hashes without verifying prior subscriptions, leading to unbounded memory growth for each connected peer. This unchecked accumulation can eventually exhaust system memory resources, resulting in a denial of service condition. The issue has been addressed in version 0.49.5.

Affected Version(s)

rust-libp2p < 0.49.5

References

https://github.com/libp2p/rust-libp2p/security/advisories...
x_refsource_CONFIRM
https://github.com/libp2p/rust-libp2p/pull/6608
x_refsource_MISC
https://github.com/libp2p/rust-libp2p/commit/51ed5f00e1b0...
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.