Bitcoin ABC 0.32.2 Release Notes

Bitcoin ABC version 0.32.2 is now available from:

https://download.bitcoinabc.org/0.32.2/

This release includes the following features and fixes:

• The “blk-bad-inputs (parallel script check failed)” error message in the debug log is replaced with a more descriptive “mandatory-script-verify-flag-failed” with an exact script error. Note that parallel validation is non-deterministic in what error it may encounter first if there are multiple issues.

Security

Mitigations have been backported to address the following vulnerabilities disclosed by Bitcoin Core. All these vulnerabilities are low severity and very unlikely to be exploited.

• CVE-2025-54604 and CVE-2025-54605: a rate limiter for the log has been implemented to prevent disk filling attacks. Some messages are unconditionally logged by the node and this behavior could be exploited to fill the disk space of a node over time. This attack would require a lot of patience as the disk will fill very slowly, and the rate limiter makes it totally impractical.
• CVE-2025-46598: improvements to script caching makes the script validation faster. It is possible for a miner to include a specially crafted non standard transaction in a block that would take up to a few seconds to validate. In the event of a block filled with such transactions, this could cause the node to spend a lot of time validating the block and thus delay the block propagation, slowing down the network. The new cache is a mitigation that makes the validation faster for such transactions.
• CVE-2025-46597: the -maxmempool and -dbcache options are now limited to prevent any integer overflow on 32-bit systems. A 32-bit version of the node could use large values for these options that would cause a memory overflow and crash the node. Note that it requires a special build of the node software as there is no 32-bit official release anymore, and even so the default options are safe.