(Pwn2Own) Redis Lua Use-After-Free Remote Code Execution Vulnerability

October 6th, 2025
ZDI-25-933 ZDI-CAN-27195

CVE ID

CVE-2025-49844

CVSS Score

9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Redis

Affected Products

Redis

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Redis. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of certain string values by the embedded Lua interpreter. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the service account.

Additional Details

Redis has issued an update to correct this vulnerability. More details can be found at:
https://github.com/redis/redis/security/advisories/GHSA-4789-qfc9-5f9q

Disclosure Timeline

  • 2025-06-05 - Vulnerability reported to vendor
  • 2025-10-06 - Coordinated public release of advisory
  • 2025-10-06 - Advisory Updated

Credit

Benny Isaacs, Nir Brakha, Sagi Tzadik (@sagitz_)

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