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 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