CVE-2026-45367: CWE-1333: Inefficient Regular Expression Complexity in hapifhir org.hl7.fhir.core
HAPI FHIR versions prior to 6.9.7 contain a vulnerability in the FHIRPathEngine component where user-supplied regular expressions are processed without effective timeouts. This can lead to catastrophic backtracking, resulting in denial of service. The issue is addressed in version 6.9.7.
AI Analysis
Technical Summary
The vulnerability CVE-2026-45367 affects the HAPI FHIR library's org.hl7.fhir.core product, specifically the FHIRPathEngine implementation. User-controlled regular expressions passed to the matches(), matchesFull(), and replaceMatches() methods are executed without timeout constraints, allowing inefficient regular expression complexity that can cause catastrophic backtracking. This results in denial of service conditions. The vulnerability is fixed in version 6.9.7.
Potential Impact
An attacker can supply crafted regular expressions that cause excessive processing time due to catastrophic backtracking, leading to denial of service. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade to HAPI FHIR version 6.9.7 or later, where this vulnerability is fixed. No other mitigations are indicated.
CVE-2026-45367: CWE-1333: Inefficient Regular Expression Complexity in hapifhir org.hl7.fhir.core
Description
HAPI FHIR versions prior to 6.9.7 contain a vulnerability in the FHIRPathEngine component where user-supplied regular expressions are processed without effective timeouts. This can lead to catastrophic backtracking, resulting in denial of service. The issue is addressed in version 6.9.7.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-45367 affects the HAPI FHIR library's org.hl7.fhir.core product, specifically the FHIRPathEngine implementation. User-controlled regular expressions passed to the matches(), matchesFull(), and replaceMatches() methods are executed without timeout constraints, allowing inefficient regular expression complexity that can cause catastrophic backtracking. This results in denial of service conditions. The vulnerability is fixed in version 6.9.7.
Potential Impact
An attacker can supply crafted regular expressions that cause excessive processing time due to catastrophic backtracking, leading to denial of service. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Upgrade to HAPI FHIR version 6.9.7 or later, where this vulnerability is fixed. No other mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-12T00:51:29.085Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a590f0b68715ace43614ec2
Added to database: 07/16/2026, 17:04:11 UTC
Last enriched: 07/16/2026, 17:17:56 UTC
Last updated: 07/16/2026, 22:52:17 UTC
Views: 8
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