CVE-2026-71155
High-severity Helidon HTTP flaw allows low-privileged attackers to read and modify data
Is CVE-2026-71155 being exploited?
Not confirmed. CVE-2026-71155 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 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-71155?
CVE-2026-71155 is rated High with a CVSS score of 8.5. 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-2026-71155?
Yes. A fix has been recorded for CVE-2026-71155. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-71155 affect?
CVE-2026-71155 affects Oracle Helidon (Imperative Web Server) 3.2.18. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-71155?
Apply vendor patch when released; restrict HTTP access to Helidon services and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Low-priv attacker over HTTP can access (read all) and partially modify (insert/update/delete) Helidon-accessible data, enabling data exfiltration and tampering.
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.