CVE-2026-23479: Redis is an in-memory data structure store

This month

HIGH 8.8UPGRADE

CVE-2026-23479 is a high-severity flaw (CVSS 8.8) 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 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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.7% (top 23%)
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: >= 7.2.0 and < 8.6.3

Fixed in: 8.6.3

Safe to downgrade to: a release before 7.2.0

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.

3. If no update is available yet, DOWNGRADE to a release before 7.2.0 (Debian / Ubuntu)

apt-cache madison redis sudo apt install redis=<VERSION_BEFORE_7.2.0> sudo apt-mark hold redis

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list redis sudo dnf downgrade redis-<VERSION_BEFORE_7.2.0> sudo dnf versionlock add redis

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

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-2026-23479?

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

Is CVE-2026-23479 being exploited?

CVE-2026-23479 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-2026-23479 affect?

CVE-2026-23479 affects redis. Severity is high (CVSS 8.8). 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 evic

How urgent is CVE-2026-23479?

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-2026-23631 HIGH 8.1 UPGRADE Redis is an in-memory data structure store

References

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