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Redis CVE-2026-23479

| EUVDEUVD-2026-27396 HIGH
Use After Free (CWE-416)
2026-05-05 GitHub_M
RCE Use After Free Memory Corruption Redis
7.7
CVSS 4.0 · Vendor: GitHub_M
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Authenticate to Redis
  2. Delivery
    Issue blocking command
  3. Exploit
    Trigger client eviction during unblock flow
  4. Execution
    Win race condition in processCommandAndResetClient
  5. Persist
    Corrupt freed memory
  6. Impact
    Execute arbitrary code as redis-server user

Vulnerability Assessment

Weakness
CWE
CWE-416
ASVS 5.0
V15 - Secure Coding and Architecture Memory lifecycle management
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploitation Conditions

Attacker must have valid Redis authentication credentials (PR:L in CVSS vector). The server must be running Redis version 7.2.0 through 8.6.2. Exploitation requires triggering a race condition where client eviction occurs precisely during the unblock client flow while processCommandAndResetClient is re-executing a previously blocked command, explaining the High attack complexity rating (AC:H). Conditions that increase exploitation probability include Redis instances with high client connection churn, aggressive maxmemory eviction policies, frequent use of blocking commands (BLPOP, BRPOP, BZPOPMIN, etc.), or near-maxclient connection limits. The attacker needs network access to the Redis port (default 6379) but does not require user interaction (UI:N). Successful exploitation demands timing precision and likely multiple attempts to win the race condition.
Impact

CVSS 7.7 (High) reflects network-based RCE potential with high impact, but attack complexity is rated High (AC:H) and requires authenticated access (PR:L), suggesting exploitation demands specific timing conditions to trigger the race between client eviction and unblock flow. The vulnerability allows complete system compromise (VC:H/VI:H/VA:H) if successfully exploited. No EPSS score provided in input data, and no CISA KEV listing indicates this is not yet observed in widespread active exploitation. Vendor-confirmed security release (8.6.3) suggests the issue was responsibly disclosed rather than discovered through incident response. Real-world risk is elevated for internet-facing Redis instances with authenticated access enabled, particularly those with high client churn or aggressive eviction policies that increase race condition probability. Priority should focus on Redis deployments allowing remote authenticated access rather than localhost-only or firewall-protected instances. The High complexity rating suggests this is not trivially exploitable without deep protocol knowledge and timing control.
Exploit ScenarioDerived

An authenticated attacker connects to a Redis instance and issues blocking commands (such as BLPOP on an empty list) to place their client in a blocked state. The attacker then manipulates server conditions to trigger client eviction during the unblock flow, such as by exhausting maxclients limits or triggering memory pressure. By precisely timing additional commands to coincide with the eviction during processCommandAndResetClient execution, the attacker triggers the use-after-free condition, gaining control over freed memory regions to inject malicious payloads and achieve arbitrary code execution on the Redis server with the privileges of the redis-server process.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – May 05, 2026

Use-after-free in Redis 7.2.0 through 8.6.2 allows authenticated attackers to achieve remote code execution by exploiting error handling in the unblock client flow. When a blocked client is evicted during command re-execution, the server fails to handle the error return from processCommandAndResetClient, triggering memory corruption. Redis has released version 8.6.3 with a security fix. No public exploit code or CISA KEV listing identified at time of analysis, suggesting limited observed exploitation despite the critical RCE impact.

RemediationAI

Upgrade to Redis 8.6.3 or later immediately, as confirmed by the official release at https://github.com/redis/redis/releases/tag/8.6.3 which addresses CVE-2026-23479 along with four additional RCE vulnerabilities. Organizations unable to patch immediately should implement network-level access controls to restrict Redis access to trusted internal networks only, disable or heavily restrict authenticated client access from untrusted sources, and monitor for unusual client eviction patterns or memory errors in Redis logs. Consider reducing maxmemory-policy aggressiveness and client timeout settings to minimize race condition windows, though these workarounds reduce availability and performance without eliminating the underlying use-after-free. Deploy Redis behind authentication proxies that can rate-limit connection churn if direct upgrade is delayed. All compensating controls are temporary-version 8.6.3 is the only complete fix for this memory safety issue.

Affected VersionsENISA

Redis 7.2.0, < 8.6.3

Affected Packages

euvd redis_7_2_0 fix: 8.6.3

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

Redis is an in-memory NoSQL database using event-driven architecture with client blocking mechanisms for commands like BLPOP and BRPOP. The vulnerability (CWE-416: Use After Free) occurs in the client unblocking flow when processCommandAndResetClient returns an error during re-execution of a previously blocked command. If client eviction happens concurrently during this flow, the server accesses freed memory without proper validation. This race condition between eviction and command processing allows memory corruption in a network-facing service. The affected CPE (cpe:2.3:a:redis:redis) confirms the core Redis server product across versions 7.2.0 through 8.6.2. CVSS 4.0 vector indicates network attack vector with high complexity (AV:N/AC:H) requiring low privileges (PR:L), with high impact to confidentiality, integrity, and availability (VC:H/VI:H/VA:H) but no scope change (SC:N/SI:N/SA:N).

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Severity by source

Vendor (GitHub_M) PRIMARY 7.7 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE 8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Red Hat 7.5 HIGH

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Vulnerable system: Confidentiality
High
Vulnerable system: Integrity
High
Vulnerable system: Availability
High
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

2
Patch available
May 05, 2026 - 18:02 EUVD
CVSS changed
May 05, 2026 - 17:22 NVD
7.7 (HIGH)

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

CVE-2026-23479 is a high-severity use-after-free vulnerability in Redis versions 7.2.0 through 8.6.2 that allows authenticated users to execute arbitrary code on affected servers. Organizations running these Redis versions face potential data theft, system compromise, and service disruption, requiring immediate patching to protect database infrastructure and dependent applications.

Business Impact: High
Compensating Controls

Vendor-released patch: Redis 8.6.3. Interim mitigations: restrict network access to Redis instances using firewall rules to limit exposure to authenticated attackers only; disable or remove non-essential user accounts with Redis authentication privileges; implement network segmentation to isolate Redis from untrusted networks; monitor Redis logs for unusual authentication patterns or command execution anomalies.

Threat Intelligence Overview

EPSS Score
0.1%
Top 72% exploitable
Exploit
POC
Public exploit code exists
Data Quality
8 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment MSRC Vendor GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC Yes
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Total

Priority Score

58
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +38
PoC: +20
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Use After Free HIGH

Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

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Same weakness CWE-416 – Use After Free

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CVE-2013-2551 HIGH POC
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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Module for Server Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected

References

Advisories & patches
ADVISORY https://seclists.org/oss-sec/2026/q2/804 ADVISORY https://vuldb.com/vuln/361202 REF https://access.redhat.com/errata/RHSA-2026:14316 REF https://access.redhat.com/errata/RHSA-2026:25216 REF https://access.redhat.com/errata/RHSA-2026:25219 REF https://access.redhat.com/errata/RHSA-2026:25925 REF https://access.redhat.com/errata/RHSA-2026:26306 REF https://access.redhat.com/errata/RHSA-2026:26540 REF https://access.redhat.com/errata/RHSA-2026:7662 REF https://access.redhat.com/security/cve/CVE-2026-23479 REF https://bugzilla.redhat.com/show_bug.cgi?id=2466780 REF https://github.com/redis/redis/releases/tag/8.6.3 REF https://github.com/redis/redis/security/advisories/GHSA-93m2-935m-8rj3 REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23479.json

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