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CVE-2026-86227

valkey-io valkey kvstore.c kvstoreGetHashtable out-of-bounds

A weakness has been identified in valkey-io valkey up to 9.0.5/9.1.1. This affects the function kvstoreGetHashtable of the file src/kvstore.c. This manipulation of the argument didx causes out-of-bounds read. It is possible to initiate the attack remotely. The attack is considered to have high complexity. It is indicated that the exploitability is difficult. The exploit has been made available to the public and could be used for attacks. Patch name: 4691888e7fab3df128f0bde5750c9fde2ae552fa. To fix this issue, it is recommended to deploy a patch. Exploitation requires cluster mode plus attacker-controlled dump.rdb at startup (data-dir write access, replication feed, or a stored crafted RDB) - an attacker-position DoS at boot, not network pre-auth. The issue report was closed stating it "is worth fixing for the sake of memory safety… but I don't think it meets our bar for a security disclosure."

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Valkey-io
Products
Valkey
CVE-2026-85522

valkey-io valkey Slot Migration cluster_migrateslots.c createSlotImportJob out-of-bounds

A vulnerability was detected in valkey-io valkey up to 9.5.4/9.1.0. Affected by this vulnerability is the function createSlotImportJob of the file src/cluster_migrateslots.c of the component Slot Migration. The manipulation of the argument job_name results in out-of-bounds read. The attack can be executed remotely. The exploit is now public and may be used. Upgrading to version 9.0.5 and 9.1.1 addresses this issue. The patch is identified as f4dc3ca09eb650c2fe14060090a41c524eca803f. Upgrading the affected component is advised.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Valkey-io
Products
Valkey
CVE-2026-82631

valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free

A security flaw has been discovered in valkey-io valkey 9.1.0. The affected element is the function handleClientsBlockedOnKey of the file src/blocked.c of the component Blocked-on-keys Subsystem. The manipulation results in use after free. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is described as difficult. The exploit has been released to the public and may be used for attacks. The patch is identified as b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b. Applying a patch is advised to resolve this issue.

CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed
Vendors
Valkey-io
Products
Valkey
CVE-2026-82677

valkey-io valkey Module Timer module.c moduleTimerHandler double free

A vulnerability was determined in valkey-io valkey 9.1.0. Impacted is the function moduleTimerHandler of the file src/module.c of the component Module Timer Subsystem. This manipulation causes double free. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: b349fe2821e3998534b1454c1b64a478daf8c6b7. To fix this issue, it is recommended to deploy a patch.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Valkey-io
Products
Valkey
CVE-2026-63639

Valkey: UAF in stream deserialization may lead to remote code execution

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 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Valkey-io
Products
Valkey
CVE-2026-56684

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

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Valkey-io
Products
Valkey
CVE-2026-27623

Valkey has Pre-Authentication DOS from malformed RESP request

Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious actor with network access to Valkey can cause the system to abort by triggering an assertion. When processing incoming requests, the Valkey system does not properly reset the networking state after processing an empty request. A malicious actor can then send a request that the server incorrectly identifies as breaking server side invariants, which results in the server shutting down. Version 9.0.3 fixes the issue. As an additional mitigation, properly isolate Valkey deployments so that only trusted users have access.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Lfprojects Valkey-io
Products
Valkey Valkey
CVE-2026-21863

Malformed Valkey Cluster bus message can lead to Remote DoS

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 actor with access to the Valkey clusterbus port can send an invalid packet that may cause an out bound read, which might result in the system crashing. The Valkey clusterbus packet processing code does not validate that a clusterbus ping extension packet is located within buffer of the clusterbus packet before attempting to read it. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue. As an additional mitigation, don't expose the cluster bus connection directly to end users, and protect the connection with its own network ACLs.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Lfprojects Valkey-io
Products
Valkey Valkey
CVE-2026-21864

Remote DoS from malformed RESTORE command

Valkey-Bloom is a Rust based Valkey module which brings a Bloom Filter (Module) data type into the Valkey distributed key-value database. Prior to commit a68614b6e3845777d383b3a513cedcc08b3b7ccd, a specially crafted `RESTORE` command can cause Valkey to hit an assertion, causes the server to shutdown. Valkey modules are required to handle errors in RDB parsing by using `VALKEYMODULE_OPTIONS_HANDLE_IO_ERRORS` flag. If this flag is not set, errors encountered during parsing result in a system assertion which shuts down the system. Even though the Valkey-bloom module correctly handled the parsing, it did not originally set the flag. Commit a68614b6e3845777d383b3a513cedcc08b3b7ccd contains a patch. One may mitigate this defect by disabling the `RESTORE` command if it is unused by one's application.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Lfprojects Valkey-io
Products
Valkey-bloom Valkey-bloom
CVE-2025-67733

Valkey Affected by RESP Protocol Injection via Lua error_reply

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 user can use scripting commands to inject arbitrary information into the response stream for the given client, potentially corrupting or returning tampered data to other users on the same connection. The error handling code for lua scripts does not properly handle null characters. Versions 9.0.2, 8.1.6, 8.0.7, and 7.2.12 fix the issue.

CVSS 3.1 · 8.5 High EPSS < 1% KEV · Not listed
Vendors
Lfprojects Valkey-io
Products
Valkey Valkey