In Bitcoin Core through 26.0 and Bitcoin Knots before 25.1.knots20231115, datacarrier size limits can be bypassed by obfuscating data as code (e.g., with OP_FALSE OP_IF), as exploited in the wild by Inscriptions in 2022 and 2023. NOTE: although this is a vulnerability from the perspective of the Bitcoin Knots project, some others consider it "not a bug."
| Software | From | Fixed in |
|---|---|---|
| bitcoin / bitcoin_core | 0.9 | 26.0.x |
| bitcoinknots / bitcoin_knots | 0.9 | 25.1 |