# CVE-2026-66373: Redis before 8.8.0, in the unusual case where an authenticated attacker can execute RESTORE, allows remote code execution via a RESTORE payload where the same NACK (pending entry) is referenced by more than one consumer, because deleting both consumers via XGROUP DELCONSUMER leads to a double free. NOTE: this issue exists because of an incomplete fix for CVE-2026-25243.

CVE-2026-66373 is fixed in 6 products on 1 platform, first by DEBIAN-CVE-2026-66373, released August 7, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-66373
- Priority: High
- CVSS: 8.8 (Important)
- EPSS: 0.0087
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 25, 2026
- Weakness: Double Free
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66373

## Description

Redis before 8.8.0, in the unusual case where an authenticated attacker can execute RESTORE, allows remote code execution via a RESTORE payload where the same NACK (pending entry) is referenced by more than one consumer, because deleting both consumers via XGROUP DELCONSUMER leads to a double free. NOTE: this issue exists because of an incomplete fix for CVE-2026-25243.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | redis Debian 12.15 (bookworm) | 5:7.0.15-1~deb12u9 | [DEBIAN-CVE-2026-66373](https://patchblox.com/security/data/fix/linux/debian-cve-2026-66373.md) | Aug 7, 2026 |
| Linux | redis RHEL 8 | 0:6.2.24-1.module+el8.10.0+24746+7b800ac5 | [RHSA-2026:64823](https://patchblox.com/security/data/fix/linux/rhsa-2026-64823.md) | Sep 13, 2026 |
| Linux | redis RHEL 9 | 0:7.2.16-1.module+el9.8.0+24745+654dcf03 | [RHSA-2026:65120](https://patchblox.com/security/data/fix/linux/rhsa-2026-65120.md) | Sep 13, 2026 |
| Linux | redis almalinux 8 | 6.2.24-1.module_el8.10.0+4271+7f8f19af | [ALSA-2026:64823](https://patchblox.com/security/data/fix/linux/alsa-2026-64823.md) | Sep 8, 2026 |
| Linux | redis almalinux 9 | 6.2.24-1.el9_8 | [ALSA-2026:64824](https://patchblox.com/security/data/fix/linux/alsa-2026-64824.md) | Sep 8, 2026 |
| Linux | redis ol 8 | 0:6.2.24-1.0.1.module+el8.10.0+91026+eb7a02a1 | [ELSA-2026-64823-0](https://patchblox.com/security/data/fix/linux/elsa-2026-64823-0.md) | Sep 9, 2026 |
| Linux | redis ol 9 | 0:7.2.16-1.0.1.module+el9.8.0+91028+45c54649 | [ELSA-2026-65120-0](https://patchblox.com/security/data/fix/linux/elsa-2026-65120-0.md) | Sep 9, 2026 |
| Linux | redis rocky 8 | 0:6.2.24-1.module+el8.10.0+40313+282db117 | [RLSA-2026:64823](https://patchblox.com/security/data/fix/linux/rlsa-2026-64823.md) | Sep 9, 2026 |
| Linux | redis rocky 9 | 0:7.2.16-1.module+el9.8.0+40315+e15874a8 | [RLSA-2026:65120](https://patchblox.com/security/data/fix/linux/rlsa-2026-65120.md) | Sep 9, 2026 |
| Linux | redis sles 15.6 | 7.2.4-150600.3.27.1 | [SUSE-SU-2026:3638-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3638-1.md) | Aug 18, 2026 |
| Linux | redis-devel RHEL 8 | 0:6.2.24-1.module+el8.10.0+24746+7b800ac5 | [RHSA-2026:64823](https://patchblox.com/security/data/fix/linux/rhsa-2026-64823.md) | Sep 13, 2026 |
| Linux | redis-devel RHEL 9 | 0:7.2.16-1.module+el9.8.0+24745+654dcf03 | [RHSA-2026:65120](https://patchblox.com/security/data/fix/linux/rhsa-2026-65120.md) | Sep 13, 2026 |
| Linux | redis-devel almalinux 8 | 6.2.24-1.module_el8.10.0+4271+7f8f19af | [ALSA-2026:64823](https://patchblox.com/security/data/fix/linux/alsa-2026-64823.md) | Sep 8, 2026 |
| Linux | redis-devel almalinux 9 | 6.2.24-1.el9_8 | [ALSA-2026:64824](https://patchblox.com/security/data/fix/linux/alsa-2026-64824.md) | Sep 8, 2026 |
| Linux | redis-devel ol 8 | 0:6.2.24-1.0.1.module+el8.10.0+91026+eb7a02a1 | [ELSA-2026-64823-0](https://patchblox.com/security/data/fix/linux/elsa-2026-64823-0.md) | Sep 9, 2026 |
| Linux | redis-devel ol 9 | 0:7.2.16-1.0.1.module+el9.8.0+91028+45c54649 | [ELSA-2026-65120-0](https://patchblox.com/security/data/fix/linux/elsa-2026-65120-0.md) | Sep 9, 2026 |
| Linux | redis-doc RHEL 8 | 0:6.2.24-1.module+el8.10.0+24746+7b800ac5 | [RHSA-2026:64823](https://patchblox.com/security/data/fix/linux/rhsa-2026-64823.md) | Sep 13, 2026 |
| Linux | redis-doc RHEL 9 | 0:7.2.16-1.module+el9.8.0+24745+654dcf03 | [RHSA-2026:65120](https://patchblox.com/security/data/fix/linux/rhsa-2026-65120.md) | Sep 13, 2026 |
| Linux | redis-doc almalinux 8 | 6.2.24-1.module_el8.10.0+4271+7f8f19af | [ALSA-2026:64823](https://patchblox.com/security/data/fix/linux/alsa-2026-64823.md) | Sep 8, 2026 |
| Linux | redis-doc almalinux 9 | 6.2.24-1.el9_8 | [ALSA-2026:64824](https://patchblox.com/security/data/fix/linux/alsa-2026-64824.md) | Sep 8, 2026 |
| Linux | redis-doc ol 8 | 0:6.2.24-1.0.1.module+el8.10.0+91026+eb7a02a1 | [ELSA-2026-64823-0](https://patchblox.com/security/data/fix/linux/elsa-2026-64823-0.md) | Sep 9, 2026 |
| Linux | redis-doc ol 9 | 0:7.2.16-1.0.1.module+el9.8.0+91028+45c54649 | [ELSA-2026-65120-0](https://patchblox.com/security/data/fix/linux/elsa-2026-65120-0.md) | Sep 9, 2026 |
| Linux | redis7 sles 15.6 | 7.0.8-150600.8.28.1 | [SUSE-SU-2026:3639-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3639-1.md) | Aug 18, 2026 |
| Linux | valkey RHEL 10 | 8.0.11-1.el10_0 | [RHSA-2026:68601](https://patchblox.com/security/data/fix/linux/rhsa-2026-68601.md) | Sep 10, 2026 |
| Linux | valkey RHEL 9 | 0:8.0.10-1.el9_8 | [RHSA-2026:64807](https://patchblox.com/security/data/fix/linux/rhsa-2026-64807.md) | Sep 13, 2026 |
| Linux | valkey almalinux 10 | 8.0.11-1.el10_2 | [ALSA-2026:64796](https://patchblox.com/security/data/fix/linux/alsa-2026-64796.md) | Sep 8, 2026 |
| Linux | valkey almalinux 9 | 8.0.10-1.el9_8 | [ALSA-2026:64807](https://patchblox.com/security/data/fix/linux/alsa-2026-64807.md) | Sep 8, 2026 |
| Linux | valkey ol 10 | 0:8.0.11-1.el10_2 | [ELSA-2026-64796-0](https://patchblox.com/security/data/fix/linux/elsa-2026-64796-0.md) | Sep 8, 2026 |
| Linux | valkey ol 9 | 0:8.0.10-1.el9_8 | [ELSA-2026-64807-0](https://patchblox.com/security/data/fix/linux/elsa-2026-64807-0.md) | Sep 8, 2026 |
| Linux | valkey rocky 10 | 0:8.0.11-1.el10_2 | [RLSA-2026:64796](https://patchblox.com/security/data/fix/linux/rlsa-2026-64796.md) | Sep 9, 2026 |
| Linux | valkey rocky 9 | 0:8.0.10-1.el9_8 | [RLSA-2026:64807](https://patchblox.com/security/data/fix/linux/rlsa-2026-64807.md) | Sep 9, 2026 |
| Linux | valkey-devel RHEL 9 | 0:8.0.10-1.el9_8 | [RHSA-2026:64807](https://patchblox.com/security/data/fix/linux/rhsa-2026-64807.md) | Sep 13, 2026 |
| Linux | valkey-devel almalinux 10 | 8.0.11-1.el10_2 | [ALSA-2026:64796](https://patchblox.com/security/data/fix/linux/alsa-2026-64796.md) | Sep 8, 2026 |
| Linux | valkey-devel almalinux 9 | 8.0.10-1.el9_8 | [ALSA-2026:64807](https://patchblox.com/security/data/fix/linux/alsa-2026-64807.md) | Sep 8, 2026 |
| Linux | valkey-devel ol 10 | 0:8.0.11-1.el10_2 | [ELSA-2026-64796-0](https://patchblox.com/security/data/fix/linux/elsa-2026-64796-0.md) | Sep 8, 2026 |
| Linux | valkey-devel ol 9 | 0:8.0.10-1.el9_8 | [ELSA-2026-64807-0](https://patchblox.com/security/data/fix/linux/elsa-2026-64807-0.md) | Sep 8, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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