Claude Code has been found to have two caching bugs that could silently increase API costs by 10-20 times.

CoinFeed reported on March 31 that, according to 1M AI News, a developer reverse-engineered a 228MB binary file of the standalone Claude Code installer using Ghidra, MITM proxy, and radare2. The developer discovered two separate caching bugs that could increase API costs by 10-20 times without the user's knowledge. The analysis has been submitted to GitHub (issue #40524) and has been flagged as a regression bug by Anthropic and assigned for handling.