Huo Xing Finance reports that Bitcoin News posted on X that Bitcoin Core has disclosed a vulnerability: when service providers bundle Bitcoin Core with Tor, incoming Tor traffic is treated as local traffic, causing nodes with whitelist settings enabled to relax spam and privacy restrictions toward external nodes, thereby granting a "trusted" status to thousands of nodes. The fix for this vulnerability was released in October 2025, but Bitcoin Core only disclosed details two weeks after ending support for the 29.x series. Additionally, another high-severity vulnerability could prevent mining nodes from constructing valid blocks until a restart; no related attacks have been reported, and nodes without whitelist settings are unaffected.
Bitcoin Core Discloses Vulnerability Affecting Tor Traffic
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Summary
Bitcoin news: A vulnerability in Bitcoin Core was disclosed, affecting Tor traffic handling. When used with Tor, incoming traffic is treated as local, allowing external nodes to bypass spam and privacy filters. A fix was released in October 2025, with the 29.x series discontinued two weeks earlier. Another vulnerability could prevent mining nodes from constructing valid blocks until a restart; no attacks have been reported. Vulnerability notice: Only nodes with whitelist settings are affected.
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