CVE-2026-73931
Unauthenticated HTTP flaw in Oracle Helidon 4.5.3 allowing data modification and partial DoS
Is CVE-2026-73931 being exploited?
Not confirmed. CVE-2026-73931 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-2026-73931?
CVE-2026-73931 is rated High with a CVSS score of 8.3. 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-2026-73931?
Yes. A fix has been recorded for CVE-2026-73931. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-73931 affect?
CVE-2026-73931 affects Oracle Helidon 4.5.3 (Imperative Web Server), Oracle Fusion Middleware components using Helidon. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-73931?
Apply vendor patch when available; block/segregate Helidon HTTP access and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote HTTP exploit can read subset of data, insert/update/delete Helidon-accessible data, and cause partial DoS.
Immediate action required
- affected>= 4.0.0 and <= 4.5.2
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.