What it is
CVE-2026-25243 is a vulnerability affecting redis. Redis is an in-memory data structure store. In versions of redis-server up to 8.6.3, the RESTORE command does not properly validate serialized values. An...
Vulnerability report
Exploitation attempts observed in the wild
High confidence
Not in CISA KEV
CVE-2026-25243
redis Remote Code Execution
Redis · affected before *
- Severity
- CVSS 7.7 · High
- Confidence
- High
- Exploit status
- Exploitation attempts observed in the wild
- EPSS
- 4.0%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Have exploitation attempts been observed?
Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Also reported by third-party sources. Confidence is high.
Who is affected?
redis affected before *.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Redis is an in-memory data structure store
Redis is an in-memory data structure store. In versions of redis-server up to 8.6.3, the RESTORE command does not properly validate serialized values. An authenticated attacker with permission to execute RESTORE can supply a crafted serialized payload that triggers invalid memory access and may lead to remote code execution.
A workaround is to restrict access to the RESTORE command with ACL rules. This is patched in version 8.6.3.
Vendor
Product
Affected
Status
Red Hat
Unaffected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
redis:6
Before *
Unaffected
Red Hat
Unaffected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
redis:6
Before *
Unaffected
Red Hat
Unaffected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
redis:6
Before *
Unaffected
Red Hat
Unaffected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
redis:6
Before *
Unaffected
Red Hat
Unaffected
Red Hat Enterprise Linux 8.8 Telecommunications Update Service
redis:6
Before *
Unaffected
Red Hat
Unaffected
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
redis:6
Before *
Unaffected
Red Hat
Unaffected
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
redis
Before *
Unaffected
Red Hat
Unaffected
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
redis
Before *
Unaffected
Red Hat
Unaffected
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
redis:7
Before *
Unaffected
redis
Affected
redis
Before 8.6.3
Affected
- Published
- 05 May 2026
- Exploitation Attempts Reported
- 18 Oct 2026
- Attack vector
- Remote
- Complexity
- High
- Privileges
- Low
- User interaction
- None
Tags
redis
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-25243
- https://github.com/redis/redis/security/advisories/GHSA-c8h9-259x-jff4 github.com · CVE Record https://github.com/redis/redis/security/advisories/GHSA-c8h9-259x-jff4
- https://github.com/redis/redis/releases/tag/8.6.3 github.com · CVE Record https://github.com/redis/redis/releases/tag/8.6.3
Exploitation evidence
Evidence of exploitation attempts
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploitation attempts observed in the wild
Defused Cyber
A trusted third party reported exploitation attempts.
Proof of concept available
GitHub
Public scanner or PoC coverage increases practical exploitability.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the Previdian Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| Defused Cyber First | 2026-10-18 12:12 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v4.0
7.7
High
Potential damage if exploited. Separate from whether attackers are using it.
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
4.0%
Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.
Weaknesses
All CVSS Scores
CVSS v4.0
7.7
High
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS v3.1
8.8
High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
captain-woof/CVE-2026-25243
github · Created 2026-08-06 06:28:46 UTC · 0 stars · AI assessment 90%
Stable POC for CVE-2026-25243 (Redis RESTORE double-free -> remote code execution)
Timeline
From disclosure to observed exploitation attempts
-
12:12 UTC
Added to Previdian KEV Feed
High-confidence, third-party report of exploitation attempts
-
06:28 UTC
Public PoC available
Public proof-of-concept code published
-
16:44 UTC
CVE published
Vulnerability disclosed publicly
-
14:44 UTC
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2026-25243
Sample API response{
"cve_id": "CVE-2026-25243",
"confidence": "High",
"cvss_score": 7.7,
"cvss_estimated": false,
"epss_score": 0.04033,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}