CVE-2025-68114: Capstone-Engine Capstone

Critical severity, CVSS 9.8. EPSS: 0.2% chance of exploitation in the next 30 days.

Capstone is a disassembly framework. In versions 6.0.0-Alpha5 and prior, an unchecked vsnprintf return in SStream_concat lets a malicious cs_opt_mem.vsnprintf drive SStream’s index negative or past the end, leading to a stack buffer underflow/overflow when the next write occurs. Commit 2c7797182a1618be12017d7d41e0b6581d5d529e fixes the issue.

Affected products

• Capstone-Engine Capstone: before 6.0.0 (fixed in 6.0.0); version 6.0.0 only

Published 2025-12-17. Last modified 2026-06-17.