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Vulnerability record · CVE-2026-63639 · published 18 August 2026

CVE-2026-63639: Use after free vulnerability

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.

8.8 CVSS 3.1 High EPSS 1.2% · top 33.9% CWE-416 · Use after free Awaiting Analysis
8.8CVSS 3.1 base score
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
12References
18 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/valkey-io/valkey/commit/06bc7768fe609f2054e69ccedefe7628f5675da9
https://github.com/valkey-io/valkey/commit/509cb3c74e8cbc9c0498ebe8b6c93dcd605e7271
https://github.com/valkey-io/valkey/commit/98465eaffe3f95524a5046318bfbc4bdb9798291
https://github.com/valkey-io/valkey/commit/e95911d4d65be8789fa3705f44d7ed1e65378445
https://github.com/valkey-io/valkey/commit/f8d2027e8d4df790ac04974bf606408c8ea62778
https://github.com/valkey-io/valkey/pull/4073
https://github.com/valkey-io/valkey/releases/tag/7.2.14
https://github.com/valkey-io/valkey/releases/tag/8.0.10
https://github.com/valkey-io/valkey/releases/tag/8.1.9
https://github.com/valkey-io/valkey/releases/tag/9.0.5
https://github.com/valkey-io/valkey/releases/tag/9.1.1
https://github.com/valkey-io/valkey/security/advisories/GHSA-mvcj-73cw-22m4

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-63639), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.