CVE-2026-47143: capstone before 5.0.8 (exclusive), 6.0.0 · update alpha1, 6.0.0 · update alpha2 (+6 more affected versions)

Affected technology

capstone · before 5.0.8 (exclusive)
capstone-engine

capstone · 6.0.0 · update alpha1
capstone-engine

capstone · 6.0.0 · update alpha2
capstone-engine

capstone · 6.0.0 · update alpha3
capstone-engine

capstone · 6.0.0 · update alpha4
capstone-engine

capstone · 6.0.0 · update alpha5
capstone-engine

capstone · 6.0.0 · update alpha6
capstone-engine

capstone · 6.0.0 · update alpha7
capstone-engine

capstone · < 5.0.8, < 6.0.0-Alpha8
capstone-engine

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Local · No privileges required · No user interaction required

Attack conditions (NVD, CVSS 3.1): Network (remote) · No privileges required · No user interaction required

What an attacker can do

The source says versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in `modRMRequired()` and `decode()` when disassembling 3DNow! opcodes (`0F 0F`) in builds compiled with `-DCAPSTONE_X86_REDUCE`, allowing a remote attacker to crash any application using the reduced X86 Capstone library by supplying a crafted input containing the 4-byte sequence `0F 0F `. Vendor/CNA’s CVSS 3.1 assessment (base score 5.1/10) rates confidentiality and integrity impact as none; availability impact as high. NVD’s CVSS 3.1 assessment (base score 5.9/10) rates confidentiality and integrity impact as none; availability impact as high.