CVE-2026-23631Network attack vector

Authenticated code execution via replica synchronization use-after-free

Published May 5, 2026 · Updated May 5, 2026

Use-after-free in Redis with Lua scripting allows remote authenticated users to execute code through replica synchronization. During master-replica synchronization, Redis reaches freed Lua-related memory, but the vendor has not disclosed the responsible function or object. Exploitation requires authenticated access and a replica configured, or reconfigurable, with replica-read-only disabled; code runs in the redis-server process.

CVSS severity6.1
Medium
EPSS probability2.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Redis with Lua scripting allows remote authenticated users to execute code through replica synchronization. During master-replica synchronization, Redis reaches freed Lua-related memory, but the vendor has not disclosed the responsible function or object. Exploitation requires authenticated access and a replica configured, or reconfigurable, with replica-read-only disabled; code runs in the redis-server process.

The record

CVE
CVE-2026-23631
Published
May 5, 2026
Updated
May 5, 2026
Vendor
Redis
Product
Redis
Classifications
CWE-416, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2026CVE publishedPublication date reported by the CVE source.
  2. May 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 8.6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Redis · Redisversion=< 8.6.3

Published CVSS scores

6.1Redis GitHub Security AdvisoryCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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