# CVE-2026-81881: radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's Mach-O Swift…

Source: https://junglewise.ai/threats/cve-2026-81881-radare2-is-a-unix-like-reverse-engineering-framework-and-command  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-22  
License: CC BY 4.0 with a link back

CVE-2026-81881 · Severity: low · CVSS 3.3 · Published 2026-09-22

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.

Technologies: [Radare2](https://junglewise.ai/threats/technologies/radare2). Vendors: [Radare](https://junglewise.ai/threats/vendors/radare).

## Quick answers

**Is CVE-2026-81881 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-81881 being exploited in the wild.

**How severe is CVE-2026-81881?** Low severity, with a CVSS score of 3.3, published 22 September 2026.

**Which products and versions are affected?** Radare2. The advisory does not name versions.

**Is there a fix for CVE-2026-81881?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-81881?** Check whether you run Radare2. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Radare2

## Related threats

- [radare2 command execution via crafted binary format](https://junglewise.ai/threats/cve-2026-108387-radare2-is-a-unix-like-reverse-engineering-framework-and-command)
- [radare2 infinite loop in NE relocation parser](https://junglewise.ai/threats/cve-2026-81885-radare2-is-a-unix-like-reverse-engineering-framework-and-command)
- [radare2 is a UNIX-like reverse engineering framework and command-line toolset. Prior to 6.2.0, radare2's binary…](https://junglewise.ai/threats/cve-2026-81882-radare2-is-a-unix-like-reverse-engineering-framework-and-command)
- [radare2 PEF loader denial of service](https://junglewise.ai/threats/cve-2026-81880-radare2-is-a-unix-like-reverse-engineering-framework-and-command)
- [radare2 heap out-of-bounds read in ELF PN_XNUM handling](https://junglewise.ai/threats/cve-2026-81879-radare2-is-a-unix-like-reverse-engineering-framework-and-command)