Bitcoin Core Discloses Medium-Risk Vulnerability Affecting Block Processing in Versions Prior to 29.2 and 30.0

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Bitcoin news: On November 10, 2026, Bitcoin Core disclosed a medium-risk vulnerability (CVE-2025-62859) affecting block processing in versions prior to 29.2 and 30.0. The flaw enables malicious nodes to exploit witness data in compact blocks, potentially triggering repeated full block requests and delays. A fix is available in versions 29.2 and 30.0. This vulnerability underscores the importance of timely upgrades to prevent service disruptions.

According to ME News, on November 11 (UTC+8), a Bitcoin Core security advisory disclosed that the medium-severity vulnerability CVE-2025-62859 was made public on November 10, 2026. This vulnerability affects versions prior to 29.2 and 30.0, where a malicious node can exploit witness data manipulation within compact blocks to cause a victim’s block processing to stall under specific conditions. Affected nodes clear their download state after reconstructing a compact block but before verifying the witness data; if verification fails, the node switches to requesting a full block from the same peer and waits 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, the attack can be repeated indefinitely. The fix is included in versions 29.2 and 30.0. (Source: ODAILY)

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