CVE-2025-68114Public exploit

Process memory corruption via unchecked formatting return

Published Dec 17, 2025 · Updated Dec 17, 2025

Memory corruption in Capstone 6.0.0-Alpha5 and earlier allows local users to corrupt a host process through a custom formatting hook. SStream_concat adds the unvalidated cs_vsnprintf return to its index, so a negative or oversized value makes SStream_concat1 write before or beyond a stack buffer. Exploitation requires an embedding to let untrusted plugins or scripts install cs_opt_mem; ordinary disassembly input cannot reach the flaw.

CVSS severity4.8
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Capstone 6.0.0-Alpha5 and earlier allows local users to corrupt a host process through a custom formatting hook. SStream_concat adds the unvalidated cs_vsnprintf return to its index, so a negative or oversized value makes SStream_concat1 write before or beyond a stack buffer. Exploitation requires an embedding to let untrusted plugins or scripts install cs_opt_mem; ordinary disassembly input cannot reach the flaw.

The record

CVE
CVE-2025-68114
Published
Dec 17, 2025
Updated
Dec 17, 2025
Vendor
Capstone Engine
Product
Capstone
Classifications
CWE-124, CWE-120
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 6.0.0-Alpha5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Capstone Engine · Capstoneversion=<= 6.0.0-Alpha5

Published CVSS scores

4.8GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-124Buffer Underwrite ('Buffer Underflow')
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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