radareorg radare2 up to 6.1.x Mach-O Swift field-metadata parser buffer overflow

Summaryinfo

A vulnerability marked as problematic has been reported in radareorg radare2 up to 6.1.x. Affected by this issue is some unknown functionality of the component Mach-O Swift field-metadata parser. This manipulation causes buffer overflow. This vulnerability is registered as CVE-2026-81881. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in radareorg radare2 up to 6.1.x. Affected by this vulnerability is an unknown code of the component Mach-O Swift field-metadata parser. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-81881 since 08/27/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 6.2.0 eliminates this vulnerability.

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Productinfo

Type

• Programming Tool Software

Vendor

• radareorg

Name

• radare2

Version

• 6.0
• 6.1

License

• open-source

Website

• Product: https://github.com/radareorg/radare2/

CPE 2.3info

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• 🔒

CPE 2.2info

• 🔒
• 🔒

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