CVE-2026-18265
Unauthenticated RCE in OSNEXUS QuantaStor via Kapacitor allowing root code execution
Is CVE-2026-18265 being exploited?
Not confirmed. CVE-2026-18265 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 0.69% probability of exploitation in the next 30 days.
How severe is CVE-2026-18265?
CVE-2026-18265 is rated Critical with a CVSS score of 9.8. 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-2026-18265?
Not known from our data. No patch reference has been recorded for CVE-2026-18265, 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-2026-18265 affect?
CVE-2026-18265 affects OSNEXUS QuantaStor, Kapacitor (QuantaStor integration). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18265?
Isolate affected hosts, block Kapacitor network access, upgrade/apply vendor patch when released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote code execution as root via Kapacitor config, enabling full system compromise, data access, and command execution.
Immediate action required
- affected6.7.3.010+9c965a6414
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.