Redis before 8.8.0, in the unusual case where an authenticated attacker can execute RESTORE, allows remote code execution via a RESTORE payload… (CVE-2026-66373)
Redis versions before 8.8.0 contain a vulnerability that allows remote code execution when an authenticated attacker can execute the RESTORE command. This occurs due to a double free condition triggered when the same NACK (pending entry) is referenced by multiple consumers and both consumers are deleted via XGROUP DELCONSUMER. The issue stems from an incomplete fix for a previous vulnerability (CVE-2026-25243).
AI Analysis
Technical Summary
This vulnerability in Redis prior to version 8.8.0 involves a double free memory error triggered by the RESTORE command in a specific scenario where an authenticated attacker can cause the same NACK to be referenced by multiple consumers. Deleting both consumers via XGROUP DELCONSUMER leads to the double free, enabling remote code execution. The flaw exists because a prior fix for CVE-2026-25243 was incomplete, leaving this exploitable condition.
Potential Impact
Successful exploitation allows an authenticated attacker to execute arbitrary code remotely on the Redis server, potentially leading to full system compromise. The vulnerability affects confidentiality, integrity, and availability of the Redis service.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict RESTORE command access to trusted users only and monitor for suspicious activity involving XGROUP DELCONSUMER commands.
Redis before 8.8.0, in the unusual case where an authenticated attacker can execute RESTORE, allows remote code execution via a RESTORE payload… (CVE-2026-66373)
Description
Redis versions before 8.8.0 contain a vulnerability that allows remote code execution when an authenticated attacker can execute the RESTORE command. This occurs due to a double free condition triggered when the same NACK (pending entry) is referenced by multiple consumers and both consumers are deleted via XGROUP DELCONSUMER. The issue stems from an incomplete fix for a previous vulnerability (CVE-2026-25243).
CVSS v3.1
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Redis prior to version 8.8.0 involves a double free memory error triggered by the RESTORE command in a specific scenario where an authenticated attacker can cause the same NACK to be referenced by multiple consumers. Deleting both consumers via XGROUP DELCONSUMER leads to the double free, enabling remote code execution. The flaw exists because a prior fix for CVE-2026-25243 was incomplete, leaving this exploitable condition.
Potential Impact
Successful exploitation allows an authenticated attacker to execute arbitrary code remotely on the Redis server, potentially leading to full system compromise. The vulnerability affects confidentiality, integrity, and availability of the Redis service.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, restrict RESTORE command access to trusted users only and monitor for suspicious activity involving XGROUP DELCONSUMER commands.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-c964-568j-vxx7
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-66373"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a6542129c2644c7f808717a
Added to database: 07/25/2026, 23:09:06 UTC
Last enriched: 07/25/2026, 23:46:11 UTC
Last updated: 07/26/2026, 05:06:36 UTC
Views: 5
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