CVE-2025-68114

Capstone is a disassembly framework. In versions 6.0.0-Alpha5 and prior, an unchecked vsnprintf return in SStream_concat lets a malicious cs_opt_mem.vsnprintf drive SStream’s index negative or past the end, leading to a stack buffer underflow/overflow when the next write occurs. Commit 2c7797182a1618be12017d7d41e0b6581d5d529e fixes the issue.

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-25)

CWEs

CWE-120, CWE-124

Published

2025-12-17

Modified

2026-10-13

Record from

the NVD, synced 2026-10-19

Affected

• capstone-engine:capstone

References

• https://github.com/capstone-engine/capstone/commit/2c7797182a1618be12017d7d41e0b6581d5d529e
• https://github.com/capstone-engine/capstone/security/advisories/GHSA-85f5-6xr3-q76r
• https://github.com/capstone-engine/capstone/security/advisories/GHSA-85f5-6xr3-q76r

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