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Full vulnerability report · 2025
CVE-2025-67873High confidence

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

capstone-engine · capstone

4.8MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archivecapstoneUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical record ↗Source updated 9 Sept 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2025-67873 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitycapstone: Capstone: Heap buffer overflow via skipdata callback allows denial of service or arbitrary code execution.
238 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • capstone-0:5.0.1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-0:5.0.1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-0:5.0.1-7.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-0:5.0.1-7.el10_0.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-0:5.0.1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-debuginfo-0:5.0.1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-debuginfo-0:5.0.1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-debuginfo-0:5.0.1-7.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-debuginfo-0:5.0.1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-debugsource-0:5.0.1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-debugsource-0:5.0.1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • capstone-debugsource-0:5.0.1-7.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
Summary
A flaw was found in Capstone, a disassembly framework. A local attacker could exploit a heap buffer overflow vulnerability by providing a specially crafted skipdata callback. This flaw occurs because the skipdata length is not properly bounds-checked, which may allow an attacker to write beyond allocated memory, potentially leading to a denial of service (DoS) or arbitrary code execution.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2025-203996

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

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.

What

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.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
local access → Heap-based Buffer Overflow → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-122 ↗

CWE-122: Heap-based Buffer Overflow. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.ILowIntegrity impact: A successful attack can cause a limited loss.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-122Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-W-2026-0769Red Hat Enterprise Linux (capstone) und OpenShift (rhcos): Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux und Red Hat OpenShift ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Dateien zu manipulieren, und um Informationen offenzulegen.

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
<= 6.0.0-Alpha5
Fixed
capstone-0:5.0.1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-0:5.0.1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-0:5.0.1-7.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-0:5.0.1-7.el10_0.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-0:5.0.1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-debuginfo-0:5.0.1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-debuginfo-0:5.0.1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-debuginfo-0:5.0.1-7.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-debuginfo-0:5.0.1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-debugsource-0:5.0.1-7.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-debugsource-0:5.0.1-7.el10_0.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-debugsource-0:5.0.1-7.el10_0.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-debugsource-0:5.0.1-7.el10_0.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0); capstone-0:5.0.1-7.el10_1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-0:5.0.1-7.el10_1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-0:5.0.1-7.el10_1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-0:5.0.1-7.el10_1.src as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-0:5.0.1-7.el10_1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-debuginfo-0:5.0.1-7.el10_1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-debuginfo-0:5.0.1-7.el10_1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-debuginfo-0:5.0.1-7.el10_1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-debuginfo-0:5.0.1-7.el10_1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-debugsource-0:5.0.1-7.el10_1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-debugsource-0:5.0.1-7.el10_1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-debugsource-0:5.0.1-7.el10_1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-debugsource-0:5.0.1-7.el10_1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10); capstone-0:4.0.2-5.el9_0.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.0); capstone-0:4.0.2-5.el9_0.i686 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.0); capstone-0:4.0.2-5.el9_0.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.0); capstone-0:4.0.2-5.el9_0.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.0); and 208 more
Action
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 17 Dec 2025 · Last source change 18 Dec 2025, 15:09 UTC · CWE-122 · Heap-based Buffer Overflow

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2025-203996
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2025-203996↗Vendor CSAF · Red Hat Product Security↗CISA Vulnrichment SSVC evidence↗Public exploit reference↗Patch or update reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2025-67873 · cve.blacktree.nl