50/100 CVSS 7.5 🔴 CVE ANALYSISPublished: July 9, 2026

org.hl7.fhir.core: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint

# Summary All implementations of FHIRPathEngine accept arbitrary FHIRPath expressions and evaluate them without input validation. The utility intended to secure this evaluation did so incorrectly, and did not fully cover all places in which evaluation was being done. An attacker can send a resource containing an evil regex pattern that causes catas...

7.5

CVSS Score

MEDIUM

Threat Level

Priority /100

TBD

Exploited ITW

Monitor

CISA Status

Sources

🔵

HIGH-PRIORITY SECURITY ADVISORY — Priority Score: 50/100

CVSS 7.5 MEDIUM. SENTINEL APEX recommends immediate patch evaluation. Intelligence from 1 confirmed source(s).

📋 Executive Summary

⚡ Analyst Assessment — SENTINEL APEX v4.0

This report analyzes CVE-2026-49485 affecting maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (CVSS 7.5, MEDIUM severity). No confirmed in-the-wild exploitation at the time of writing; prioritize on exposure, privilege, and CVSS. Corroborated across 1 source(s): github_advisories. Verify all specifics against the primary sources linked below before acting.

Intelligence sources: github_advisories

🧮 Severity Anatomy — CVSS 3.1 vector, decoded from the primary record

The base score summarizes severity in one number; the vector explains why. Each row below is a direct read of the official CVSS vector — verifiable against the NVD record.

Metric	Value	What it means for defenders
Attack Vector	Network `AV:N`	Remotely exploitable across the network — internet-facing instances are directly at risk.
Attack Complexity	Low `AC:L`	No special conditions — reliably repeatable by an attacker.
Privileges Required	None `PR:N`	No authentication needed — pre-auth exploitation.
User Interaction	None `UI:N`	No victim action required — fully automatable.
Scope	Unchanged `S:U`	Impact confined to the vulnerable component.
Confidentiality Impact	None `C:N`	No confidentiality impact.
Integrity Impact	None `I:N`	No integrity impact.
Availability Impact	High `A:H`	Total loss of availability — full denial of service possible.

🧬 Weakness Anatomy — CWE-400, the underlying flaw class

This vulnerability is classified as CWE-400: Uncontrolled Resource Consumption in the primary record. The mechanics below are characteristic of this weakness class (per the MITRE CWE corpus), not a claim about a specific exploit observed against your environment.

How it's exploited	Attacker exhausts CPU, memory, disk, or connections to cause denial of service.
Detect & prevent	Rate limiting, quotas, timeouts, backpressure. Detect via resource-utilization spikes and request-rate anomalies.

⚠️ Business Impact Analysis

⚠️ Remote code execution — full server takeover without authentication possible

🔗 Representative Attack Path

A typical attack path for this vulnerability class, mapped to MITRE ATT&CK. This is a representative model to guide detection and defense — not a claim of observed activity against a specific target. Confirm specifics against the primary sources below.

#	Phase	Attacker Action	MITRE
1	Reconnaissance	Attacker identifies exposed ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 instances via Shodan, Censys, or targeted scanning	`TA0043`
2	Initial Access	Exploitation of CVE-2026-49485 in maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2	`T1190`
3	Execution	Remote code execution achieved — attacker runs arbitrary commands on target system	`T1203`
4	Persistence	Backdoor, scheduled task, or new admin account created for persistent access	`T1053`
5	Command & Control	Attacker establishes persistent C2 channel using HTTPS or DNS tunneling	`T1071`
6	Impact / Objectives	Intellectual property theft, espionage, cryptomining, or preparation for future attack stage	`T1657`

⚠ Deep Dive Analysis

This high-severity vulnerability in maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 (CVSS 7.5) represents a significant attack surface. SENTINEL APEX assesses exploitation to be technically feasible with moderate effort. Organizations running ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 in internet-facing or privileged positions face immediate risk.

SENTINEL APEX URGENCY: ELEVATED. Score: 50/100 MEDIUM. Patch before exploitation activity begins.

🧠 Structured Intelligence Assessment

SENTINEL APEX analytical tradecraft separates verified fact from labeled assessment and states intelligence gaps explicitly. Confidence reflects evidentiary support, not certainty.

✔ Verified Facts

Affected CVE(s): CVE-2026-49485, CVE-2026-49485.
Affected technology: maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2.
CVSS base score of 7.5 assigned by an authoritative source.
1 MITRE ATT&CK technique(s) evidenced in the source material.

🕸️ Correlated Observations

Vendor maven has been targeted in 6 prior CYBERDUDEBIVASH reports (recurring target)

🧩 Analyst Assessments

MEDIUM CONF Technical severity is assessed as high (CVSS 7.5); realized business impact depends on asset exposure and data classification.

❓ Intelligence Gaps

No confirmed public IOCs are available at report time; detection currently relies on behavioral analytics.
In-the-wild exploitation is unconfirmed as of this report.
Attribution to a specific threat actor is not established by the available evidence.

🔮 Forward Outlook

MEDIUM CONF Given the repeated targeting pattern, further activity against this vendor/sector is probable.

🧬 Prior Intelligence Context

This report is correlated against CYBERDUDEBIVASH SENTINEL APEX's persistent analyst memory. The following entities have been tracked in prior intelligence:

Vendor maven — previously observed 6 times in CYBERDUDEBIVASH intelligence since 2026-07-06 (recent: cve-2026-49832-maven-org-dspace-dspace-api, cve-2026-49464-maven-nl-nl-portal-taak)
ATT&CK technique T1498 — previously observed once in CYBERDUDEBIVASH intelligence since 2026-07-07 (recent: cve-2026-53530-rust-ratex-parser)

🎯 MITRE ATT&CK Mapping

Category	Mapping
Primary Tactic	Execution
Primary Technique	T1203 — Exploitation for Client Execution
Sub-Technique	T1059 — Command & Scripting Interpreter
Weakness (CWE)	CWE-400
Intel Type	🔴 CVE ANALYSIS
Source(s)	github_advisories

🔴 CVE Reference

CVE ID	Reference	Score
CVE-2026-49485	NVD →	7.5
CVE-2026-49485	NVD →	7.5

🔍 Detection Rules — Sigma (SIEM)

Deploy to Splunk, Elastic, Microsoft Sentinel, or QRadar. SOC Pro subscribers receive pre-compiled SIEM-native query packs updated with each pipeline run.

Sigma YAMLtitle: CVE-2026-49485 Exploitation Attempt — maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2
id: 1d17d064c85758ab-43b0
status: experimental
description: Detects exploitation of CVE-2026-49485 in maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2. Priority: MEDIUM. Score: 50/100
author: CYBERDUDEBIVASH SENTINEL APEX v4.0 (bivash@cyberdudebivash.com)
date: 2026-07-09
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-49485
    - https://blog.cyberdudebivash.in/
tags:
    - attack.initial_access
    - attack.t1190
    - cve-2026-49485
    - cve-2026-49485
logsource:
    category: webserver
detection:
    keywords:
        - 'CVE-2026-49485'
        - 'CVE-2026-49485'
        - 'cve-2026-49485'
    condition: keywords
falsepositives:
    - Security scanners
level: medium

📡 Detection Rules — YARA (Endpoint)

Deploy to endpoint detection platforms. Enterprise subscribers receive tuned, FP-validated YARA rule packs.

YARArule CVE_2026_49485_Exploitation {
    meta:
        description = "Detects artifacts related to CVE-2026-49485 exploitation in maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2"
        author      = "CYBERDUDEBIVASH SENTINEL APEX v4.0"
        date        = "2026-07-09"
        severity    = "HIGH"
        cvss        = "7.5"
        priority    = "50/100"
        threat_level = "MEDIUM"
        reference   = "https://nvd.nist.gov/vuln/detail/CVE-2026-49485"
    strings:
        $id_str  = "CVE-2026-49485" ascii nocase
        $product = "ca_uhn_hapi_fhir_org_hl7_fhir_dstu2" ascii nocase wide
    condition:
        any of them
}

🎯 Multi-Audience Intelligence Products

This single analysis is packaged for every stakeholder — from the boardroom to the SOC — plus a machine-readable feed for API and MSSP integration. Enterprise & SOC Pro subscribers receive these as structured deliverables.

🏛 Executive Advisory — CISO / Security Leadership

Affected CVE(s): CVE-2026-49485, CVE-2026-49485.
Affected technology: maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2.
CVSS base score of 7.5 assigned by an authoritative source.
1 MITRE ATT&CK technique(s) evidenced in the source material.

Owner	Decision	Timeline
CISO / SOC Lead	Authorize response activation and detection deployment	Within 24h
Vulnerability Mgmt	Prioritize remediation/patching of maven assets	Within 7 days
Legal / Privacy	Assess regulatory notification obligations if in-scope data is at risk	Within 48h

📋 Board Brief

A high-severity cyber threat affects maven ca.uhn.hapi.fhir:org.hl7.fhir.dstu2.
Technical severity is rated 7.5/10.
Primary exposure is operational disruption, data loss, and potential regulatory liability (e.g. GDPR, NIS2, DORA, SOC 2) where in-scope systems are affected.
Mitigation depends on vendor guidance and compensating controls.
Recommended posture: authorize prioritized remediation and confirm detection coverage with the security team.

🛡 SOC Bulletin

Severity HIGH · Detection coverage: 0 technique(s) across behavioral analytics · 0 network rule(s)

P1: Sweep 14 days of telemetry for the mapped ATT&CK techniques.
P2: Update threat-intel platform and downstream detection feeds with confirmed indicators.

🔭 Threat Hunting Guide

T1498 — Network Denial of Service: Hunt for network denial of service activity (impact); evidence basis: racking, exhausting system resources, and causing Denial-of-Service. ## Details The vulnerability exists in regex exe

⎋ Machine-readable intelligence: this report is available as a structured JSON package (MITRE ATT&CK, IOCs, multi-platform detections, analyst assessments) at /api/intel/products/cve-2026-49485-maven-ca-uhn-hapi-fhir-org-hl7-fhir-dstu2.json — built for SIEM, SOAR, and MSSP integration.

🛡️ SOC Response Playbook

1IMMEDIATE (0-1hr): Identify all instances of ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 in your environment via CMDB/asset inventory
2IMMEDIATE (0-1hr): Apply vendor patch — no maintenance window exception for MEDIUM threats
3IMMEDIATE (1-2hr): If no patch available: implement WAF rules, ACLs, or network-level compensating controls
4SHORT-TERM (2-4hr): Deploy Sigma detection rule to SIEM — validate alert generation in test environment
5SHORT-TERM (4-8hr): Review logs for exploitation indicators (anomalous ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 requests, error spikes)
6SHORT-TERM (8-24hr): Hunt for post-exploitation: new admin accounts, scheduled tasks, lateral movement
7MONITOR: Subscribe to maven security advisories for patch updates
8ONGOING: Track SENTINEL APEX intelligence feed for follow-on campaigns targeting ca.uhn.hapi.fhir:org.hl7.fhir.dstu2

📎 Intelligence References

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⚡ CYBERDUDEBIVASH SENTINEL APEX v4.0

Intelligence report generated by CYBERDUDEBIVASH SENTINEL APEX v4.0
Report ID: SENTINEL-CVE-2026-49485-2026-07-09 | Priority: 50/100 MEDIUM | Sources: 1
© 2026 CYBERDUDEBIVASH PRIVATE LIMITED
Republication requires written attribution to CYBERDUDEBIVASH SENTINEL APEX

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