SB20260509121 - Fedora EPEL 8 update for valkey
Published: May 9, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2026-23479)
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to use-after-free in the unblock client flow when a blocked client is evicted while re-executing a blocked command. A remote user can trigger this condition to execute arbitrary code.
The issue occurs because processCommandAndResetClient does not handle an error return value in this flow.
2) Heap-based buffer overflow (CVE-ID: CVE-2026-25243)
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper input validation in the RESTORE command when processing a specially crafted serialized payload. A remote user can send a specially crafted serialized payload to execute arbitrary code.
Exploitation requires permission to execute the RESTORE command.
3) Use-after-free (CVE-ID: CVE-2026-23631)
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to use-after-free in the Lua scripting synchronization mechanism when exploiting master-replica synchronization. A remote user can trigger the flaw through crafted Lua script execution to execute arbitrary code.
Only replicas with replica-read-only disabled are vulnerable.
Remediation
Install update from vendor's website.