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.
Weakness
The product calls free() twice on the same memory address.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | RedHat | valkey-0:8.0.11-1.el10_2 | * |
| Red Hat Enterprise Linux 10.0 Extended Update Support | RedHat | valkey-0:8.0.11-1.el10_0 | * |
| Red Hat Enterprise Linux 8 | RedHat | redis:6-8100020260821173603.489197e6 | * |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | RedHat | redis:6-8040020260916133739.522a0ee4 | * |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | RedHat | redis:6-8040020260916133739.522a0ee4 | * |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | RedHat | redis:6-8060020260916133704.ad008a3a | * |
| Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | RedHat | redis:6-8060020260916133704.ad008a3a | * |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service | RedHat | redis:6-8080020260916133522.63b34585 | * |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | RedHat | redis:6-8080020260916133522.63b34585 | * |
| Red Hat Enterprise Linux 9 | RedHat | valkey-0:8.0.10-1.el9_8 | * |
| Red Hat Enterprise Linux 9 | RedHat | redis-0:6.2.24-1.el9_8 | * |
| Red Hat Enterprise Linux 9 | RedHat | redis:7-9080020260821173335.9 | * |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | RedHat | redis-0:6.2.7-1.el9_2.7 | * |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | RedHat | redis:7-9040020260917140622.9 | * |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | RedHat | redis-0:6.2.7-1.el9_4.7 | * |
| Red Hat Enterprise Linux 9.6 Extended Update Support | RedHat | redis-0:6.2.24-1.el9_6 | * |
| Red Hat Enterprise Linux 9.6 Extended Update Support | RedHat | redis:7-9060020260917140656.9 | * |
| Red Hat Hardened Images | RedHat | valkey-main-9.0.5-0.1.hum1 | * |
Potential Mitigations
References
- https://github.com/berabuddies/redis-poc
- https://github.com/redis/redis/compare/8.6.4...8.8.0
- https://github.com/redis/redis/pull/15081
- https://news.ycombinator.com/item?id=49024938
- https://x.com/Fried_rice/status/2080059356322918777
- https://lists.debian.org/debian-lts-announce/2026/08/msg00012.html
- https://github.com/berabuddies/redis-poc