Vulnerability · Published Aug 14, 2026 · Assigned by GitHub_M
CVE-2026-49282Capstone M68K and RISCV `cs_insn_name()` invalid IDs can trigger out-of-bounds reads and process crashes
Medium 5.1
In plain English
A medium-severity out-of-bounds read in capstone from capstone-engine. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Official description
Capstone is a disassembly framework. Prior to version 6.0.0-Alpha9, Capstone's public `cs_insn_name()` API forwards caller-supplied instruction IDs directly to the selected architecture backend. Most backends validate the ID before indexing instruction-name tables, but the M68K and RISCV backends have missing or incomplete bounds checks. On a Capstone handle opened for M68K or RISCV, a caller-controlled invalid instruction ID can trigger an out-of-bounds read and crash the process. The demonstrated impact is availability loss in applications or bindings that expose instruction-name lookup to untrusted IDs. No code execution or data disclosure was demonstrated. Version 6.0.0-Alpha9 patches the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | capstone | no fix listed | DEBIAN-CVE-2026-49282 |
| Debian:13 | capstone | no fix listed | DEBIAN-CVE-2026-49282 |
| Debian:14 | capstone | no fix listed | DEBIAN-CVE-2026-49282 |
| Ubuntu:22.04:LTS | capstone | no fix listed | UBUNTU-CVE-2026-49282 |
| Ubuntu:24.04:LTS | capstone | no fix listed | UBUNTU-CVE-2026-49282 |
| Ubuntu:26.04:LTS | capstone | no fix listed | UBUNTU-CVE-2026-49282 |
| Ubuntu:26.10 | capstone | no fix listed | UBUNTU-CVE-2026-49282 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| capstone-engine | capstone | < 6.0.0-Alpha9 |
Weakness: CWE-125, CWE-129, CWE-191 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L