Regular Expression Denial of Service (ReDoS)

Overview Affected versions of this package are vulnerable to Regular Expression Denial of Service ReDoS via the matches function in the FHIRPathEngine. An attacker can exhaust system resources and cause service disruption by submitting specially crafted regular expressions that trigger excessive...

GHSA-FXJ4-P9XP-37V5 HAPI FHIR: Incomplete fix for CVE-2026-45367: DSTU2 FHIRPathEngine.matches() missing RegexTimeout protection allows ReDoS

Summary The fix for CVE-2026-45367 added RegexTimeout protection to the matches function in DSTU2016MAY, DSTU3, R4, R4B, and R5, but the DSTU2 module was incompletely patched. In org.hl7.fhir.dstu2, replaceMatches was updated while matches at line 2462 still calls the raw String.matchessw without...

GHSA-3653-68V6-RQ57 HAPI FHIR: 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 FHIRPath functions matches, matchesFull, and replaceMatches pass user-controlled regular expressions directly to Java's Pattern.compile and String.replaceAll without...

Regular Expression Denial of Service (ReDoS)

Overview Affected versions of this package are vulnerable to Regular Expression Denial of Service ReDoS via the matches, matchesFull, and replaceMatches functions in the FHIRPathEngine. An attacker can exhaust system resources and cause service disruption by submitting specially crafted regular...

PT-2026-41778

Name of the Vulnerable Software and Affected Versions FHIRPathEngine affected versions not specified Description Implementations of FHIRPathEngine evaluate arbitrary FHIRPath expressions without input validation. The functions matches, matchesFull, and replaceMatches pass user-controlled regular...