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Valkey CVE-2026-56684

| EUVDEUVD-2026-60822 HIGH
Use After Free (CWE-416)
2026-08-18 GitHub_M
7.5
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.5 HIGH
AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.5 HIGH

Network-reachable TLS port justifies AV:N; race-condition timing requirement justifies AC:H; valid authentication is required so PR:L; full CIA:H reflects confirmed crash and plausible RCE impact.

3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Source Code Evidence Fetched
Aug 18, 2026 - 15:25 vuln.today
Analysis Generated
Aug 18, 2026 - 15:25 vuln.today
Patch available
Aug 18, 2026 - 15:02 EUVD
CVE Published
Aug 18, 2026 - 14:19 cve.org
HIGH 7.5

DescriptionCVE.org

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.

AnalysisAI

Use-after-free in Valkey's TLS connection handler allows an authenticated remote attacker to crash the server or potentially achieve remote code execution on TLS-enabled deployments. The flaw exists across all Valkey branches prior to 7.2.14, 8.0.10, 8.1.9, 9.0.5, and 9.1.1, confirmed via GitHub security advisory GHSA-53mc-f3m3-99vh and EUVD-2026-60822. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to TLS-enabled Valkey instance
Delivery
Identify or induce a concurrent TLS connection in tlsProcessPendingData
Exploit
Issue CLIENT KILL targeting that connection at precise iteration moment
Execution
Trigger use-after-free via listDelNode on cached iterator node
Impact
Crash server process or corrupt heap layout for code execution

Vulnerability AssessmentAI

Exploitation TLS must be explicitly enabled in Valkey's configuration (via tls-port and associated certificate settings), which is not the default in all deployments - instances running without TLS are entirely unaffected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 7.5 with vector AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H reflects a serious but meaningfully constrained risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated low-privileged attacker holding a valid TLS session to Valkey issues a CLIENT KILL command targeting another active TLS connection at the precise moment tlsProcessPendingData is iterating the pending_list, freeing the iterator's cached next-node pointer. The resulting use-after-free crashes the server process or, if the attacker can additionally control heap layout through prior memory-grooming requests, redirects execution to attacker-controlled code. …
Remediation The primary remediation is to upgrade to one of the patched releases - 7.2.14, 8.0.10, 8.1.9, 9.0.5, or 9.1.1 - all available at the official GitHub release pages (https://github.com/valkey-io/valkey/releases/tag/7.2.14, /8.0.10, /8.1.9, /9.0.5, /9.1.1). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all Valkey instances running TLS and document their current versions. …

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CVE-2026-56684 vulnerability details – vuln.today

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