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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bitcoin | 31.0-2.1 | openSUSE-SU-2026:11073-1 |
| openSUSE Leap 16.0 | bitcoin | 27.1-bp160.2.1 | openSUSE-SU-2026:21149-1 |
Advisories 2
- openSUSE-SU-2026:21149-1 Security update for bitcoin SUSE / openSUSE Security Updates · Jun 30, 2026
- openSUSE-SU-2026:11073-1 bitcoin-qt6-31.0-2.1 on GA media SUSE / openSUSE Security Updates · Jun 24, 2026
References
- https://en.bitcoin.it/wiki/Common_Vulnerabilities_and_Exposures
- https://github.com/bitcoin/bitcoin/releases/tag/v25.0
- https://bitcoincore.org/en/2024/10/08/disclose-blocktxn-crash/
- https://github.com/bitcoin/bitcoin/pull/26898
- https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-25.0.md