CVE-2025-67873: capstone Heap Overflow

Description

Capstone is a disassembly framework. In versions 6.0.0-Alpha5 and prior, Skipdata length is not bounds-checked, so a user-provided skipdata callback can make cs_disasm/cs_disasm_iter memcpy more than 24 bytes into cs_insn.bytes, causing a heap buffer overflow in the disassembly path. Commit cbef767ab33b82166d263895f24084b75b316df3 fixes the issue.

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CVSS v3.1 Score

4.8

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

Weakness Type (CWE)

CWE-122 CWE-122

Affected Products

Vendor	Product	Versions
capstone-engine	capstone	< 6.0.0
capstone-engine	capstone	All
capstone-engine	capstone	All
capstone-engine	capstone	All
capstone-engine	capstone	All
capstone-engine	capstone	All

References

Advisories & Patches

https://github.com/capstone-engine/capstone/commit/cbef767ab33b82166d263895f24084b75b316df3 https://github.com/capstone-engine/capstone/security/advisories/GHSA-hj6g-v545-v7jg https://github.com/capstone-engine/capstone/security/advisories/GHSA-hj6g-v545-v7jg

Exploits

https://github.com/capstone-engine/capstone/security/advisories/GHSA-hj6g-v545-v7jg https://github.com/capstone-engine/capstone/security/advisories/GHSA-hj6g-v545-v7jg

Frequently Asked Questions

What is CVE-2025-67873? +

Capstone is a disassembly framework. In versions 6.0.0-Alpha5 and prior, Skipdata length is not bounds-checked, so a user-provided skipdata callback can make cs_disasm/cs_disasm_iter memcpy more than 24 bytes into cs_insn.bytes, causing a heap buffer overflow in the disassembly path. Commit cbef767ab33b82166d263895f24084b75b316df3 fixes the issue. It has a CVSS v3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2025-67873? +

CVE-2025-67873 has a CVSS v3.1 score of 4.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-67873? +

CVE-2025-67873 affects products from capstone-engine, specifically: capstone. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-67873? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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