CVE-2026-55470: hl7 fhir core before 6.9.10 (exclusive); +1 more affected products

CVE-2026-55470. CVSS 3.1 base score 7.5 (HIGH, Vendor/CNA). EPSS 0.0068 (percentile 0.51896), scored 24-Oct-2026.

Affected technology

hl7 fhir core · before 6.9.10 (exclusive)
hapifhir

org.hl7.fhir.core · < 6.9.10
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 unauthenticated attacker can trigger catastrophic regex backtracking and exhaust server CPU. Vendor/CNA’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality and integrity impact as none; availability impact as high.

Published 25-Oct-2026 19:51 UTC

CWE: 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: 0.0068 · percentile 0.52128 · 2026-10-25
KEV: no

Provenance

FIRST EPSS daily exploit-probability · Source record · observed 2026-10-25 19:52:47.952465+00:00 UTC
NVD CVE API 2.0 · Source record · observed 2026-10-25 19:51:06.643138+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2026-55470.html