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    CVE-2026-63639

    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.

    Published:Aug 18, 2026
    Last Modified:Aug 21, 2026
    EPS:Aug 18, 2026
    EPSS Score:0.00888
    CVSS Score:8.8

    Affected Products

    Vendor
    Valkey-io
    Product
    Valkey

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-86227 (CVSS 1.3) — A weakness has been identified in valkey-io valkey up to 9.0.5/9.1.1. This affects the function kvstoreGetHash…
    CVE-2026-85522 (CVSS 5.5) — A vulnerability was detected in valkey-io valkey up to 9.5.4/9.1.0. Affected by this vulnerability is the func…
    CVE-2026-82677 (CVSS 1.9) — A vulnerability was determined in valkey-io valkey 9.1.0. Impacted is the function moduleTimerHandler of the f…
    CVE-2026-82631 (CVSS 1.2) — A security flaw has been discovered in valkey-io valkey 9.1.0. The affected element is the function handleClie…
    CVE-2026-56684 (CVSS 7.5) — 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 tlsProc…
    CVE-2026-27623 (CVSS 7.5) — Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious …
    CVE-2026-21863 (CVSS 7.5) — Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious act…
    CVE-2025-67733 (CVSS 8.5) — Valkey is a distributed key-value database. Prior to versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12, a malicious use…

    References

    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High