CVE-2026-23631: Redis is an in-memory data structure store

Q: How do I fix CVE-2026-23631?

redis: upgrade to 8.6.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-23631 being exploited?

CVE-2026-23631 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-23631 affect?

CVE-2026-23631 affects redis. Severity is high (CVSS 8.1). Redis is an in-memory data structure store. In all versions of redis-server with Lua scripting, an authenticated attacker can exploit the master-replica synchronization mechanism to trigger a use-after-free on replicas where replica-read-on

This month

HIGH 8.1UPGRADE

CVE-2026-23631 is a high-severity flaw (CVSS 8.1) affecting redis. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Redis is an in-memory data structure store. In all versions of redis-server with Lua scripting, an authenticated attacker can exploit the master-replica synchronization mechanism to trigger a use-after-free on replicas where replica-read-only is disabled or can be disabled, which may lead to remote code execution. A workaround is to prevent users from executing Lua scripts or avoid using replicas where replica-read-only is disabled. This is patch

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-05-05
Last modified	2026-07-25

Publisher (CNA): GitHub, Inc. · Vendor: redis

Last updated 2026-07-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-05 17:17 UTCPublished CVE record published
2026-07-25 11:10 UTCUpdated Record last modified

redis redis UPGRADE

Affected: < 8.6.3

Fixed in: 8.6.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy redis || rpm -q redis || redis --version

2. UPGRADE to 8.6.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade redis

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade redis

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Official advisories

Canadian Cyber Centre: Redis security advisory (AV26-423) - Update 1 2026-10-19
AlmaLinux Errata: [ALSA-2026:25925] Important: valkey security update 2026-07-02
AlmaLinux Errata: [ALSA-2026:25219] Important: redis:7 security update 2026-06-12

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23631?

redis: upgrade to 8.6.3. Exact commands for each OS are on this page.

Is CVE-2026-23631 being exploited?

CVE-2026-23631 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23631 affect?

CVE-2026-23631 affects redis. Severity is high (CVSS 8.1). Redis is an in-memory data structure store. In all versions of redis-server with Lua scripting, an authenticated attacker can exploit the master-replica synchronization mechanism to trigger a use-after-free on replicas where replica-read-on

How urgent is CVE-2026-23631?

Priority 50/100. High severity

Software pages

Redis vulnerabilities

Related CVEs

CVE-2026-25243 HIGH 8.8 UPGRADE Redis is an in-memory data structure store
CVE-2026-23479 HIGH 8.8 UPGRADE Redis is an in-memory data structure store

References

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