radareorg radare2 up to 6.1.x Lua bytecode parser Lua 5.3 bytecode function parser out-of-bounds

Summaryinfo

A vulnerability, which was classified as problematic, has been found in radareorg radare2 up to 6.1.x. Impacted is the function Lua 5.3 bytecode function parser of the component Lua bytecode parser. The manipulation leads to out-of-bounds. This vulnerability is traded as CVE-2026-81883. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in radareorg radare2 up to 6.1.x and classified as problematic. This issue affects the function Lua 5.3 bytecode function parser of the component Lua bytecode parser. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is integrity, and 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 Lua 5.3 bytecode function parser was vulnerable because the Lua 5.3 bytecode function parser read fixed function-metadata fields immediately after a function-name string without checking the remaining buffer length. The vulnerability is triggered by opening or inspecting a crafted Lua 5.3 bytecode file whose function-name string ends at the input-buffer boundary. The parser read two integers and three one-byte fields beyond the allocated input buffer. This can cause invalid parser results 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. The identification of this vulnerability is CVE-2026-81883 since 08/27/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

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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