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CVE-2026-56684: Valkey: TLS pending-data processing use-after-free may allow remote code execution

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-18 · updated 2026-10-22
• Weakness: CWE-416

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 tlsProcessPendingData function iterates pending_list while an authenticated client can trigger CLIENT KILL, causing connTLSClose to delete the iterator's cached next node and producing a use-after-free that can crash the server or potentially allow remote code execution when TLS is enabled. This issue is fixed in versions 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1.

Affected products

• valkey-io valkey: before 7.2.14; from 8.0.0, < 8.0.10; from 8.1.0, < 8.1.9; from 9.0.0, < 9.0.5; from 9.1.0, < 9.1.1

References

• https://github.com/valkey-io/valkey/commit/7cd5bcb7575d750ec2de618db80da58680a10fe3
• https://github.com/valkey-io/valkey/pull/4234
• 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-53mc-f3m3-99vh

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