CVE-2026-66373: 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.

highCVSS 7.5CVE-2026-66373

CSIRTS triage

vendor: Redis product: Redis Remote code executionaffected: < 8.8.0

What: An authenticated attacker can execute remote code via a RESTORE payload referencing the same NACK by multiple consumers.
Who is affected: Deployments of Redis versions before 8.8.0 are affected.
Urgency: Remediation is urgent due to the high severity and potential for remote code execution.
Action: Upgrade Redis to version 8.8.0 or later to resolve the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.5
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66373

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-663730.47% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-66373	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Redis

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[NEU] [mittel] Redis: Schwachstelle ermöglicht Codeausführungcert-bund · 2026-07-31
unknownRedis security advisory (AV26-748)cccs · 2026-07-27
medium[UPDATE] [medium] Redis: Multiple vulnerabilities allow execution of arbitrary program codecert-bund · 2026-07-27
highCVE-2026-66373: Redis before 8.8.0, in the unusual case where an authenticated attacker can execute RESTORE, a…nvd · 2026-07-25
highGHSA-855v-hq7w-jmjw: Open WebUI: Realtime endpoints accept Redis-revoked JWTs after signout/backchannel logoutghsa · 2026-07-24
highCVE-2026-59219: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9…nvd · 2026-07-09