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.