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Redis < 8.8.0 RCE via RESTORE Double Free (CVE-2026-66373)

high Nessus Plugin ID 331358

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Synopsis

The remote Redis server is affected by a remote code execution vulnerability.

Description

The version of Redis installed on the remote host is prior to 8.8.0.
It is, therefore, affected by a remote code execution vulnerability.

 - Redis before 8.8.0, in the unusual case where an authenticated attacker can execute RESTORE, allows remote code execution via a RESTORE payload where the same NACK (pending entry) is referenced by more than one consumer, because deleting both consumers via XGROUP DELCONSUMER leads to a double free. NOTE: this issue exists because of an incomplete fix for CVE-2026-25243.
 (CVE-2026-66373)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update to Redis 8.8.0 or later.

See Also

https://github.com/redis/redis/pull/15081

Plugin Details

Severity: High

ID: 331358

File Name: redis_cve-2026-66373.nasl

Version: 1.3

Type: Remote

Family: Misc.

Published: 7/31/2026

Updated: 8/7/2026

Configuration: Enable paranoid mode, Enable thorough checks (optional)

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.17

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:H/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-66373

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:redis:redis

Required KB Items: Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 5/25/2026

Vulnerability Publication Date: 7/25/2026

Reference Information

CVE: CVE-2026-66373

IAVA: 2026-A-0784