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CVE-2026-49485: org.hl7.fhir.core < 6.9.4.2, >= 6.9.5, < 6.9.9
CVE-2026-49485. CVSS 3.1 base score 7.5 (HIGH, Vendor/CNA). EPSS 0.00684 (percentile 0.52065), scored 24-Oct-2026.
Affected technology
org.hl7.fhir.core · < 6.9.4.2, >= 6.9.5, < 6.9.9
hapifhir
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · No user interaction required
What an attacker can do
An attacker can send a resource containing an evil regex pattern that causes catastrophic backtracking, exhausting CPU resources and causing denial of service in the FHIR Validator HTTP endpoint and affected org.hl7.fhir.* modules. Vendor/CNA’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and integrity impact as none; availability impact as high.
- CWE
- CWE-400, CWE-1333
- CCR priority
- 30.2 /100 (P4)
- CVSS 3.1
- 7.5 /10 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H · Vendor/CNA
- EPSS
- 0.00684 · percentile 0.52065 · 2026-10-24
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-25 01:28:19.133527+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-49485.html