Affects Oracle Helidon (Oracle enterprise product); unauthenticated remote compromise of data and partial DoS is broadly impactful to enterprise apps.
CVE-2026-71166
Unauthenticated HTTP vuln allows full data compromise and partial DoS in Oracle Helidon 3.2.18
Is CVE-2026-71166 being exploited?
Not confirmed. CVE-2026-71166 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 0.42% probability of exploitation in the next 30 days.
How severe is CVE-2026-71166?
CVE-2026-71166 is rated Critical with a CVSS score of 9.4. 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-2026-71166?
Yes. A fix has been recorded for CVE-2026-71166. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-71166 affect?
CVE-2026-71166 affects Oracle Helidon 3.2.18, Oracle Fusion Middleware - Imperative Web Server (Helidon). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-71166?
Block/limit HTTP access to Helidon, deploy WAF, isolate instances, and apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote HTTP exploit allows attackers to read, create, modify, delete all Helidon-accessible data and cause partial DoS.
Immediate action required
- affected>= 3.0.0 and <= 3.2.17
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.