---
id: CVE-2026-81881
title: radare2 is a UNIX-like reverse engineering framework and command-line toolset
summary: >-
  radare2 is a UNIX-like reverse engineering framework and command-line toolset.
  Prior to 6.2.0, radare2's Mach-O Swift field-metadata parser was vulnerable
  because a relative Swift field pointer could be lower than the field-metadata
  sect…
severity: low
cvss: 3.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'
cwe:
  - CWE-125
  - CWE-191
vendor: radare
product: radare2
affected:
  - radare2 < 6.2.0
patched:
  - radare2 6.2.0
published: '2026-09-22'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T16:49:14.450'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81881'
references:
  - url: >-
      https://github.com/radareorg/radare2/commit/1da6e782df220edf56138ef5fe4f33745b04db74
    label: security-advisories@github.com
  - url: 'https://github.com/radareorg/radare2/issues/26229'
    label: security-advisories@github.com
  - url: 'https://github.com/radareorg/radare2/releases/tag/6.2.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/radareorg/radare2/security/advisories/GHSA-q4w7-225g-64j9
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00125
epssPercentile: 0.0186
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T17:33:03.527976Z'
ingestedAt: '2026-09-22T16:06:00.502Z'
---

## Overview

radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Mach-O Swift field-metadata parser was vulnerable because a relative Swift field pointer could be lower than the field-metadata section base, making subtraction produce a negative logical index. The vulnerability is triggered by parsing Swift type and class metadata from a crafted Mach-O file. The derived index was used to read four bytes immediately before the allocated field-metadata buffer. This can cause incorrect metadata processing or process termination; no attacker-observable memory disclosure has been demonstrated. This issue is fixed in version 6.2.0.

## Affected

- `radare2 < 6.2.0`

## Remediation

Upgrade past the affected range:

- `radare2 6.2.0`