CVE-2026-86227

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."

Database specific

{
    "cna_assigner": "VulDB",
    "cwe_ids": [
        "CWE-119",
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86227.json"
}

References

Affected packages

Git / github.com/valkey-io/valkey

Affected ranges

Type

GIT

Repo

https://github.com/valkey-io/valkey

Events

Introduced

5018b12b0de2d2322a1bbf6b041c43740587c0f2

Fixed

4691888e7fab3df128f0bde5750c9fde2ae552fa

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "9.0.0"
        },
        {
            "last_affected": "9.0.0"
        },
        {
            "introduced": "9.0.1"
        },
        {
            "last_affected": "9.0.1"
        },
        {
            "introduced": "9.0.2"
        },
        {
            "last_affected": "9.0.2"
        },
        {
            "introduced": "9.0.3"
        },
        {
            "last_affected": "9.0.3"
        },
        {
            "introduced": "9.0.4"
        },
        {
            "last_affected": "9.0.4"
        },
        {
            "introduced": "9.0.5"
        },
        {
            "last_affected": "9.0.5"
        },
        {
            "introduced": "9.1.0"
        },
        {
            "last_affected": "9.1.0"
        },
        {
            "introduced": "9.1.1"
        },
        {
            "last_affected": "9.1.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

9.*

9.0.0

9.0.1

9.0.2

9.0.3

9.0.4

9.0.5

9.1.0

9.1.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86227.json"

vanir_signatures

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vanir_signatures_modified

"2026-09-11T08:25:03Z"