CVE-2026-18691
Critical RCE allowing full system compromise; vendor details withheld.
Is CVE-2026-18691 being exploited?
Not confirmed. CVE-2026-18691 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-18691?
CVE-2026-18691 is rated Critical with a CVSS score of 9.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-18691?
Not known from our data. No patch reference has been recorded for CVE-2026-18691, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-18691 affect?
CVE-2026-18691 affects Unknown (details withheld), Vendor/product not disclosed. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18691?
Isolate exposed hosts, increase logging/IDS, hunt for IOCs, apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Network-accessible remote code execution enabling full system takeover and potential data exfiltration.
Immediate action required
- affected>= 8.3.0 and < 8.3.8
- affected>= 8.0 and < 8.0.29
- affected>= 7.0 and < 7.0.40
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.