Is CVE-2026-63639 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-63639?

CVE-2026-63639 has a CVSS v3 severity of HIGH (8.8).

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CVE-2026-63639

Description

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.