CVE-2024-35202

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-10 · updated 2026-06-17
Weakness: CWE-770

Description

Bitcoin Core before 25.0 allows remote attackers to cause a denial of service (blocktxn message-handling assertion and node exit) by including transactions in a blocktxn message that are not committed to in a block's merkle root. FillBlock can be called twice for one PartiallyDownloadedBlock instance.

Affected products

Bitcoin Core: before 25.0 — fixed in 25.0

How to fix

Upgrade to a fixed version: Bitcoin Core 25.0. Check the vendor advisory for mitigations.

References

https://bitcoincore.org/en/2024/10/08/disclose-blocktxn-crash/
https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures
https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-25.0.md
https://github.com/bitcoin/bitcoin/pull/26898
https://github.com/bitcoin/bitcoin/releases/tag/v25.0

Get alerted when CVE-2024-35202 or the next vulnerability affects your stack