Numeric Truncation Error Affecting capstone-engine/capstone package, versions [,6.0.0-Alpha9)
Threat Intelligence
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.
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Test your applications- Snyk IDSNYK-UNMANAGED-CAPSTONEENGINECAPSTONE-18856234
- published16 Aug 2026
- disclosed14 Aug 2026
- creditsondt99, zxcvbbq
Introduced: 14 Aug 2026
NewCVE-2026-49263 (opens in a new tab)How to fix?
Upgrade capstone-engine/capstone to version 6.0.0-Alpha9 or higher.
Overview
Affected versions of this package are vulnerable to Numeric Truncation Error in read_brtable in arch/WASM/WASMDisassembler.c. An attacker can cause no-progress disassembly or parser desynchronization by supplying a large, well-formed br_table instruction through cs_disasm() or cs_disasm_iter(). The decoder accumulates the br_table payload length in a wider temporary, then returns it through the 16-bit instruction-size path used by Capstone’s WASM disassembler. When the encoded instruction reaches 65,536 bytes or more, the returned size wraps or becomes too small, so callers can keep decoding the same input or advance into the middle of the instruction stream, causing availability loss and incorrect analysis output.