High severity · published May 5, 2026
CVE-2026-23479
redis-server use-after-free in unblock client flow may allow remote code execution
8.8
CVSS
1.7%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 77% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RE
Redis · Redis
>= 7.2.0, < 8.6.3 · source: vendor, NVD
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 10.0 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9.6 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23479
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23479
Release Notes
https://github.com/redis/redis/releases/tag/8.6.3
Vendor Advisory
https://github.com/redis/redis/security/advisories/GHSA-93m2-935m-8rj3
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:14316
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:25216
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:25219
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:25925
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