CVE-2023-26248

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-25 · updated 2026-06-17
Weakness: CWE-352

Description

The Kademlia DHT (go-libp2p-kad-dht 0.20.0 and earlier) used in IPFS (0.18.1 and earlier) assigns routing information for content (i.e., information about who holds the content) to be stored by peers whose peer IDs have a small DHT distance from the content ID. This allows an attacker to censor content by generating many Sybil peers whose peer IDs have a small distance from the content ID, thus hijacking the content resolution process.

Affected products

Kademila Dht: before 0.18.1 — fixed in 0.18.1

How to fix

Upgrade to a fixed version: Kademila Dht 0.18.1. Check the vendor advisory for mitigations.

References

https://arxiv.org/abs/2307.12212
https://github.com/libp2p/go-libp2p-kad-dht

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