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An interesting PR in Bitcoin Core has attracted attention: developers are submitting patches for version v29 to fix a known vulnerability CVE-2025-46598.
The question is—why patch old versions?
The root cause lies in a major change in v30: proposal #32406 removed the 80-byte limit on the OP_RETURN opcode. This change altered the default data storage policy, causing behavioral differences between versions.
Some node operators are still using v29. If they do not apply this security patch, they face potential risks. This involves a classic technical dilemma—how to balance advancing innovation with maintaining backward compatibility.