Heap-based Buffer Overflow Affecting capstone-engine/capstone package, versions [,6.0.0-Alpha10)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Heap-based Buffer Overflow vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-UNMANAGED-CAPSTONEENGINECAPSTONE-19233393
- published23 Aug 2026
- disclosed21 Aug 2026
- credit1g1n0
Introduced: 21 Aug 2026
NewCVE-2026-55893 (opens in a new tab)How to fix?
Upgrade capstone-engine/capstone to version 6.0.0-Alpha10 or higher.
Overview
Affected versions of this package are vulnerable to Heap-based Buffer Overflow via the set_reg_n function. An attacker can cause a four-byte heap buffer overflow by supplying crafted SH2A FPU bytecode processed through cs_disasm_iter or cs_disasm with specific architecture and mode options, potentially leading to process crashes or arbitrary code execution depending on heap layout.