CVE-2026-23479
Analyzed Analyzed - Analysis Complete
Use-After-Free in Redis Server via Blocked Command Re-execution

Publication date: 2026-05-05

Last updated on: 2026-05-06

Assigner: GitHub, Inc.

Description
Redis is an in-memory data structure store. In redis-server from 7.2.0 until 8.6.3, the unblock client flow does not handle an error return from `processCommandAndResetClient` when re-executing a blocked command. If a blocked client is evicted during this flow, an authenticated attacker can trigger a use-after-free that may lead to remote code execution. This has been patched in version 8.6.3.
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Meta Information
Published
2026-05-05
Last Modified
2026-05-06
Generated
2026-06-16
AI Q&A
2026-05-05
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23479
EUVD
EUVD-2026-27396
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
redis redis From 7.2.0 (inc) to 8.6.3 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

CVE-2026-23479 is a use-after-free vulnerability in Redis versions from 7.2.0 up to 8.6.3. It occurs in the unblock client flow when a blocked client is evicted while re-executing a blocked command. The issue arises because the code does not properly handle an error return from the function processCommandAndResetClient. This flaw allows an authenticated attacker to trigger a use-after-free condition, which may lead to remote code execution.

Impact Analysis

This vulnerability can have severe impacts including allowing an attacker to execute arbitrary code remotely on the affected Redis server. It poses high risks to the confidentiality, integrity, and availability of the system. Because it can be exploited by an authenticated user with low privileges and does not require user interaction, it increases the attack surface significantly. Successful exploitation could lead to full system compromise.

Mitigation Strategies

The immediate step to mitigate this vulnerability is to upgrade Redis to version 8.6.3 or later, where the use-after-free issue in the unblock client flow has been patched.

Compliance Impact

CVE-2026-23479 is a high-severity vulnerability that can lead to remote code execution, impacting the confidentiality, integrity, and availability of systems running affected Redis versions.

Such impacts on system security could potentially affect compliance with standards and regulations like GDPR and HIPAA, which require protection of sensitive data and system integrity.

However, the provided information does not explicitly describe how this vulnerability directly affects compliance with these or other common standards and regulations.

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