CVE-2026-23479
redis-server use-after-free in unblock client flow may allow remote code execution
- Published
- May 5, 2026
- Updated
- Jul 16, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 11, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XLow · next 30 days
- Percentile
- 70.0%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Redis is an in-memory data structure store. In redis-server from 7.2.0 until 8.6.3, the unblock client flow does not handle an error return from `processCommandAndResetClient` when re-executing a blocked command. If a blocked client is evicted during this flow, an authenticated attacker can trigger a use-after-free that may lead to remote code execution. This has been patched in version 8.6.3.
Sources
2- CVE-2026-23479Exploit
Redis UAF RCE PoC collection for CVE-2026-23479: safe version checker, exploit module, GDB-assisted PoC, and Sigma detection rules for authorized testing.
Proof of concept with GDB‑assisted exploitation (educational / lab use only)
Responsible use
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