CVE-2026-82631

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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82631.json",
    "cna_assigner": "VulDB",
    "cwe_ids": [
        "CWE-119",
        "CWE-416"
    ]
}

References

Affected packages

Git / github.com/valkey-io/valkey

Affected ranges

Type

GIT

Repo

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

Events

Introduced

c9e8005e9d0ec817e26c7db318861cb821409249

Fixed

b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b

Database specific

Show details

{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "9.1.0"
        },
        {
            "last_affected": "9.1.0"
        }
    ]
}

Affected versions

9.*

9.1.0

Database specific

vanir_signatures

[
    {
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "224212326133507980516476871434833225764",
                "180911272441217126914259233718729396533",
                "76251647179270472373396840484895292057",
                "107800714045205141807014340762746926866",
                "185665389199785095687028863708427211703"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-82631-504c8bcb",
        "target": {
            "file": "tests/modules/blockonkeys.c"
        },
        "source": "https://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b",
        "signature_version": "v1"
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 728.0,
            "function_hash": "246169775744230407966315073595625919800"
        },
        "id": "CVE-2026-82631-74665c71",
        "target": {
            "function": "handleClientsBlockedOnKey",
            "file": "src/blocked.c"
        },
        "source": "https://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b",
        "signature_version": "v1"
    },
    {
        "signature_type": "Function",
        "deprecated": false,
        "digest": {
            "length": 2119.0,
            "function_hash": "115977004619012109065296146380830898796"
        },
        "id": "CVE-2026-82631-8b57d61f",
        "target": {
            "function": "ValkeyModule_OnLoad",
            "file": "tests/modules/blockonkeys.c"
        },
        "source": "https://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b",
        "signature_version": "v1"
    },
    {
        "signature_type": "Line",
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "160692568258425592405757227686407219811",
                "123563816099661161587764117289571183922",
                "202700731399895605414755438673930269808",
                "278823690545426334719441701333950642347",
                "261857039035298197721982772646061177326",
                "297990788943995378858675851745255264843",
                "150985041832129135443991331363748982923",
                "110765998793895318489718687274492570696",
                "156008437170646869390169523302166225491",
                "24906264981807179007779248023450493340",
                "71989013983000452619034111722700885273",
                "333975116974296080170551909932216584306",
                "137273233740802796325660789051528006838",
                "108587633537507210242609878158511307392",
                "122389095718077750204702522837943200772"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-82631-ae5e80aa",
        "target": {
            "file": "src/blocked.c"
        },
        "source": "https://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b",
        "signature_version": "v1"
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82631.json"

vanir_signatures_modified

"2026-09-02T08:08:03Z"