Capstone doesn't check Skipdata length, leading to cs_insn.bytes heap buffer overflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-67873
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-17 22:16:00 UTC
Updated2026-10-13 11:10:00 UTC
DescriptionCapstone 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-122 | CWE-122 CWE-122: Heap-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1[email protected]Secondary4.8MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
3.1CNADECLARED4.8MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Capstone-engine Capstone All All All All
Application Capstone-engine Capstone 6.0.0 alpha1 All All
Application Capstone-engine Capstone 6.0.0 alpha2 All All
Application Capstone-engine Capstone 6.0.0 alpha3 All All
Application Capstone-engine Capstone 6.0.0 alpha4 All All
Application Capstone-engine Capstone 6.0.0 alpha5 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Capstone-engine Capstone affected <= 6.0.0-Alpha5 Not specified

References

ReferenceSourceLinkTags
github.com/capstone-engine/capstone/commit/cbef767ab33b82166d263895f2408... [email protected] github.com Patch
github.com/capstone-engine/capstone/security/advisories/GHSA-hj6g-v545-v7jg 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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