# CVE-2026-21863: Malformed Valkey Cluster bus message can lead to Remote DoS CVE-2026-21863 is fixed in 10 products on 1 platform, first by valkey-redis-compat 7.2.12+dfsg1-0ubuntu0.1, released February 23, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-21863 - Priority: High - CVSS: 8.5 (Important) - EPSS: 0.0085 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Feb 23, 2026 - Weakness: Out-of-bounds Read - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21863 ## Description Valkey is an advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets. You can run atomic operations on these types, like appending to a string; incrementing the value in a hash; pushing to a list; computing set intersection, union and difference; or getting the member with highest ranking in a sorted set. In order to achieve its outstanding performance, Valkey works with an in-memory dataset. Depending on your use case, you can persist it either by dumping the dataset to disk every once in a while, or by appending each command to a log. Valkey also supports trivial-to-setup master-slave replication, with very fast non-blocking first synchronization, auto-reconnection on net split and so forth. Other features include Transactions, Pub/Sub, Lua scripting, Keys with a limited time-to-live, and configuration settings to make Valkey behave like a cache. You can use Valkey from most programming languages also. Security Fix(es): * Valkey: Valkey: Data tampering and denial of service via improper null character handling in Lua scripts (CVE-2025-67733) * valkey: Valkey: Denial of Service via invalid clusterbus packet (CVE-2026-21863) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | redict Debian 14 | 7.3.6+ds-2 | [DEBIAN-CVE-2026-21863](https://patchblox.com/security/data/fix/linux/debian-cve-2026-21863.md) | Feb 23, 2026 | | Linux | redis Debian 12.15 (bookworm) | 5:7.0.15-1~deb12u7 | [DEBIAN-CVE-2026-21863](https://patchblox.com/security/data/fix/linux/debian-cve-2026-21863.md) | Feb 23, 2026 | | Linux | redis Debian 13.5 (trixie) | 5:8.0.2-3+deb13u2 | [DEBIAN-CVE-2026-21863](https://patchblox.com/security/data/fix/linux/debian-cve-2026-21863.md) | Feb 23, 2026 | | Linux | redis Debian 14 | 5:8.0.6-1 | [DEBIAN-CVE-2026-21863](https://patchblox.com/security/data/fix/linux/debian-cve-2026-21863.md) | Feb 23, 2026 | | Linux | valkey Debian 13.5 (trixie) | 8.1.1+dfsg1-3+deb13u2 | [DEBIAN-CVE-2026-21863](https://patchblox.com/security/data/fix/linux/debian-cve-2026-21863.md) | Feb 23, 2026 | | Linux | valkey Debian 14 | 8.1.4+dfsg1-2 | [DEBIAN-CVE-2026-21863](https://patchblox.com/security/data/fix/linux/debian-cve-2026-21863.md) | Feb 23, 2026 | | Linux | valkey RHEL 10 | 8.0.7-1.el10_0 | [RHSA-2026:5445](https://patchblox.com/security/data/fix/linux/rhsa-2026-5445.md) | Mar 12, 2026 | | Linux | valkey RHEL 9 | 0:8.0.7-1.el9_7 | [RHSA-2026:3507](https://patchblox.com/security/data/fix/linux/rhsa-2026-3507.md) | Mar 12, 2026 | | Linux | valkey almalinux 10 | 8.0.7-1.el10_1 | [ALSA-2026:3443](https://patchblox.com/security/data/fix/linux/alsa-2026-3443.md) | Feb 26, 2026 | | Linux | valkey almalinux 9 | 8.0.7-1.el9_7 | [ALSA-2026:3507](https://patchblox.com/security/data/fix/linux/alsa-2026-3507.md) | Mar 2, 2026 | | Linux | valkey amzn 2023 | 8.0.6-3.amzn2023.0.3 | [ALAS2023-2026-1471](https://patchblox.com/security/data/fix/linux/alas2023-2026-1471.md) | Mar 2, 2026 | | Linux | valkey ol 10 | 0:8.0.7-1.el10_1 | [ELSA-2026-3443](https://patchblox.com/security/data/fix/linux/elsa-2026-3443.md) | Feb 26, 2026 | | Linux | valkey ol 9 | 0:8.0.7-1.el9_7 | [ELSA-2026-3507](https://patchblox.com/security/data/fix/linux/elsa-2026-3507.md) | Mar 2, 2026 | | Linux | valkey opensuse-leap 15.6 | 8.0.7-150600.13.20.1 | [SUSE-SU-2026:0685-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0685-1.md) | Feb 27, 2026 | | Linux | valkey rocky 10 | 0:8.0.7-1.el10_1 | [RLSA-2026:3443](https://patchblox.com/security/data/fix/linux/rlsa-2026-3443.md) | Feb 28, 2026 | | Linux | valkey rocky 9 | 0:8.0.7-1.el9_7 | [RLSA-2026:3507](https://patchblox.com/security/data/fix/linux/rlsa-2026-3507.md) | Mar 5, 2026 | | Linux | valkey sles 15.7 | 8.0.7-150700.3.14.1 | [SUSE-SU-2026:0848-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0848-1.md) | Mar 7, 2026 | | Linux | valkey-debuginfo amzn 2023 | 8.0.6-3.amzn2023.0.3 | [ALAS2023-2026-1471](https://patchblox.com/security/data/fix/linux/alas2023-2026-1471.md) | Mar 2, 2026 | | Linux | valkey-debugsource amzn 2023 | 8.0.6-3.amzn2023.0.3 | [ALAS2023-2026-1471](https://patchblox.com/security/data/fix/linux/alas2023-2026-1471.md) | Mar 2, 2026 | | Linux | valkey-devel RHEL 9 | 0:8.0.7-1.el9_7 | [RHSA-2026:3507](https://patchblox.com/security/data/fix/linux/rhsa-2026-3507.md) | Mar 12, 2026 | | Linux | valkey-devel almalinux 10 | 8.0.7-1.el10_1 | [ALSA-2026:3443](https://patchblox.com/security/data/fix/linux/alsa-2026-3443.md) | Feb 26, 2026 | | Linux | valkey-devel almalinux 9 | 8.0.7-1.el9_7 | [ALSA-2026:3507](https://patchblox.com/security/data/fix/linux/alsa-2026-3507.md) | Mar 2, 2026 | | Linux | valkey-devel amzn 2023 | 8.0.6-3.amzn2023.0.3 | [ALAS2023-2026-1471](https://patchblox.com/security/data/fix/linux/alas2023-2026-1471.md) | Mar 2, 2026 | | Linux | valkey-devel ol 10 | 0:8.0.7-1.el10_1 | [ELSA-2026-3443](https://patchblox.com/security/data/fix/linux/elsa-2026-3443.md) | Feb 26, 2026 | | Linux | valkey-devel ol 9 | 0:8.0.7-1.el9_7 | [ELSA-2026-3507](https://patchblox.com/security/data/fix/linux/elsa-2026-3507.md) | Mar 2, 2026 | | Linux | valkey-redis-compat Ubuntu 24.04.5 LTS (noble) | 7.2.12+dfsg1-0ubuntu0.1 | [valkey-redis-compat 7.2.12+dfsg1-0ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-valkey-redis-compat-7.2.12-dfsg1-0ubuntu0.1.md) | Feb 23, 2026 | | Linux | valkey-sentinel Ubuntu 24.04.5 LTS (noble) | 7.2.12+dfsg1-0ubuntu0.1 | [valkey-sentinel 7.2.12+dfsg1-0ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-valkey-sentinel-7.2.12-dfsg1-0ubuntu0.1.md) | Feb 23, 2026 | | Linux | valkey-sentinel Ubuntu 25.10 (questing) | 8.1.6+dfsg1-0ubuntu0.1 | [valkey-sentinel 8.1.6+dfsg1-0ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-valkey-sentinel-8.1.6-dfsg1-0ubuntu0.1.md) | Feb 23, 2026 | | Linux | valkey-server Ubuntu 24.04.5 LTS (noble) | 7.2.12+dfsg1-0ubuntu0.1 | [valkey-server 7.2.12+dfsg1-0ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-valkey-server-7.2.12-dfsg1-0ubuntu0.1.md) | Feb 23, 2026 | | Linux | valkey-server Ubuntu 25.10 (questing) | 8.1.6+dfsg1-0ubuntu0.1 | [valkey-server 8.1.6+dfsg1-0ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-valkey-server-8.1.6-dfsg1-0ubuntu0.1.md) | Feb 23, 2026 | | Linux | valkey-tools Ubuntu 24.04.5 LTS (noble) | 7.2.12+dfsg1-0ubuntu0.1 | [valkey-tools 7.2.12+dfsg1-0ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-valkey-tools-7.2.12-dfsg1-0ubuntu0.1.md) | Feb 23, 2026 | | Linux | valkey-tools Ubuntu 25.10 (questing) | 8.1.6+dfsg1-0ubuntu0.1 | [valkey-tools 8.1.6+dfsg1-0ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-valkey-tools-8.1.6-dfsg1-0ubuntu0.1.md) | Feb 23, 2026 | --- Data as of 2026-11-08T13:06:02Z UTC. 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