Valkey UAF via Malformed RDB Restore (7.2.14/8.0.10/8.1.9/9.0.5/9.1.1)
CVE-2026-63639 Published on August 18, 2026
Valkey: UAF in stream deserialization may lead to remote code execution
Valkey is a distributed key-value database. Prior to 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1, Valkey's RESTORE command accepts a malformed RDB stream payload that assigns one Pending Entry List NACK to multiple consumers during stream consumer-group deserialization, causing a use-after-free when one consumer is deleted while another still references the shared NACK and potentially allowing remote code execution. This issue is fixed in versions 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1.
Vulnerability Analysis
CVE-2026-63639 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-63639 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-63639
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Affected Versions
valkey-io valkey:- Version < 7.2.14 is affected.
- Version >= 8.0.0, < 8.0.10 is affected.
- Version >= 8.1.0, < 8.1.9 is affected.
- Version >= 9.0.0, < 9.0.5 is affected.
- Version >= 9.1.0, < 9.1.1 is affected.