Redis up to 8.2.1 Lua RediShell use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.9$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Redis up to 8.2.1. The affected element is an unknown function of the component Lua Handler. Executing a manipulation can lead to use after free. This vulnerability is tracked as CVE-2025-49844. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Redis up to 8.2.1 and classified as critical. This vulnerability affects an unknown functionality of the component Lua Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Redis is an open source, in-memory database that persists on disk. Versions 8.2.1 and below allow an authenticated user to use a specially crafted Lua script to manipulate the garbage collector, trigger a use-after-free and potentially lead to remote code execution. The problem exists in all versions of Redis with Lua scripting. This issue is fixed in version 8.2.2. To workaround this issue without patching the redis-server executable is to prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands.

The advisory is shared for download at github.com. This vulnerability was named CVE-2025-49844 since 06/11/2025. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 269464 (Linux Distros Unpatched Vulnerability : CVE-2025-49844), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.2.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch d5728cb5795c966c5b5b1e0f0ac576a7e69af539 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (269464) and CERT Bund (WID-SEC-2025-2196). Additional details are provided at wiz.io. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • Trend Micro Apex One
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Redis
  • F5 BIG-IP

Productinfo

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.0
VulDB Meta Temp Score: 8.9

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

Researcher Base Score: 9.9
Researcher Vector: 🔒

NVD Base Score: 9.9
NVD Vector: 🔒

CNA Base Score: 9.9
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 269464
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-49844

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Redis 8.2.2
Patch: d5728cb5795c966c5b5b1e0f0ac576a7e69af539

Timelineinfo

06/11/2025 CVE reserved
10/04/2025 +115 days Advisory disclosed
10/04/2025 +0 days VulDB entry created
01/15/2026 +103 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-4789-qfc9-5f9q
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2025-49844 (🔒)
GCVE (CVE): GCVE-0-2025-49844
GCVE (VulDB): GCVE-100-326992
CERT Bund: WID-SEC-2025-2196 - Redis: Mehrere Schwachstellen

Misc.: 🔒

Entryinfo

Created: 10/04/2025 07:50
Updated: 01/15/2026 19:50
Changes: 10/04/2025 07:50 (67), 10/06/2025 22:17 (6), 10/07/2025 06:20 (11), 10/07/2025 22:25 (4), 10/08/2025 17:26 (2), 10/09/2025 12:31 (14), 10/09/2025 13:00 (2), 10/30/2025 00:26 (1), 11/15/2025 15:10 (1), 01/15/2026 19:50 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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