Bitcoin Core Fixes Medium Severity Vulnerability CVE-2025-62859

Bitcoin Core's security announcement reveals that the medium severity vulnerability CVE-2025-62859 was disclosed on November 10, 2026. This vulnerability exists in versions prior to 29.2 and 30, where malicious nodes can exploit witness data in compact blocks to stall the block processing of victims under certain conditions. The announcement states that affected nodes clear their download status after reconstructing the compact block and before checking the witness data. If the check fails, the node will revert to requesting the full block and wait for a 10-minute timeout. If an attacker controls three high-bandwidth peer nodes of the victim, or if the victim is running in -blockonly mode, this attack can be repeated indefinitely. The vulnerability was discovered and responsibly disclosed by Eugene Siegel, and the fix has been included in Bitcoin Core versions 29.2 and 30.

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