Multiple Vulnerabilities in Redis Allow Remote Code Execution

On May 6, 2026, CERT-FR published an advisory regarding multiple vulnerabilities discovered in Redis, a popular in-memory data structure store. These vulnerabilities, detailed in Redis security bulletins GHSA-8ghh-qpmp-7826, GHSA-93m2-935m-8rj3, and GHSA-c8h9-259x-jff4, could allow a remote attacker to execute arbitrary code on a vulnerable system. The vulnerabilities impact all versions of Redis. Successful exploitation could lead to a complete compromise of the Redis server and any data it holds. Defenders should apply patches or workarounds as soon as possible to mitigate the risk.

Attack Chain

1. The attacker identifies a vulnerable Redis instance exposed to the network.
2. The attacker leverages one of the vulnerabilities (CVE-2026-23479, CVE-2026-23631, or CVE-2026-25243) to inject malicious code.
3. This code could involve crafting a specific request that exploits a buffer overflow or other memory corruption issue in Redis.
4. The injected code is executed within the context of the Redis server process.
5. The attacker gains control of the Redis server process.
6. The attacker uses the compromised Redis server to execute arbitrary system commands.
7. The attacker may install a persistent backdoor for future access.
8. The attacker can then move laterally within the network, compromise other systems, or exfiltrate sensitive data.

Impact

Successful exploitation of these vulnerabilities in Redis can lead to a complete compromise of the affected system. This could result in data theft, data corruption, or denial of service. Given the widespread use of Redis in various applications and services, a successful attack could have a significant impact on organizations that rely on it. The number of potential victims is substantial, spanning various sectors that utilize Redis for caching, session management, and real-time analytics.

Recommendation

• Immediately apply the security patches provided by Redis to address CVE-2026-23479, CVE-2026-23631, and CVE-2026-25243.
• Monitor network traffic for suspicious activity targeting Redis ports, as indicated by the network connection logs and firewall logs.
• Implement strict access control policies to limit access to Redis instances, based on network connection logs.
• Deploy the Sigma rule "Detect Suspicious Redis Activity" to identify potential exploitation attempts.