{"id":"CVE-2026-45367","aliases":["EUVD-2026-44983","GHSA-3653-68v6-rq57","ROOT-APP-MAVEN-CVE-2026-45367"],"status":"published","title":"HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint","description":"HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.7, the FHIRPathEngine implementation passes user-controlled regular expressions from matches(), matchesFull(), and replaceMatches() to Java regex operations without effective timeouts, allowing catastrophic backtracking and denial of service. This issue is fixed in version 6.9.7.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00684,"percentile":0.52827,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-1333"],"published":"2026-05-18T20:23:54Z","modified":"2026-10-28T10:55:20Z","fixes":[{"ecosystem":"Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.dstu2","fixed_in":["6.9.7"],"sources":["ghsa","osv"]},{"ecosystem":"Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may","fixed_in":["6.9.7"],"sources":["ghsa","osv"]},{"ecosystem":"Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.dstu3","fixed_in":["6.9.7"],"sources":["ghsa","osv"]},{"ecosystem":"Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.r4","fixed_in":["6.9.7"],"sources":["ghsa","osv"]},{"ecosystem":"Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.r4b","fixed_in":["6.9.7"],"sources":["ghsa","osv"]},{"ecosystem":"Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.r5","fixed_in":["6.9.7"],"sources":["ghsa","osv"]},{"ecosystem":"Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.validation","fixed_in":["6.9.7"],"sources":["ghsa","osv"]},{"ecosystem":"Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli","fixed_in":["6.9.7"],"sources":["ghsa","osv"]},{"ecosystem":"Root:Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.validation","fixed_in":["6.7.9-aikido.7","6.9.0-aikido.8","6.7.9-aikido.6","6.9.0-aikido.9","6.7.9-aikido.8","6.7.9-aikido.10","6.7.9-aikido.9","6.9.0-aikido.10","6.9.4.1-aikido.3","6.9.0-aikido.11","6.4.0-aikido.2","6.9.4.1-aikido.2","6.0.1-aikido.2","6.0.1-aikido.3","6.0.1-aikido.4"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.dstu2","fixed_in":["6.7.9-aikido.7","6.9.0-aikido.8","6.7.9-aikido.6","6.9.0-aikido.9","6.7.9-aikido.8","6.7.9-aikido.10","6.7.9-aikido.9","6.9.0-aikido.10","6.9.4.1-aikido.3","6.5.27-aikido.1","6.4.0-aikido.2","6.9.4.1-aikido.2","6.0.1-aikido.2","6.9.0-aikido.11","6.0.1-aikido.3","6.0.1-aikido.4"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may","fixed_in":["6.7.9-aikido.7","6.9.0-aikido.8","6.7.9-aikido.6","6.9.0-aikido.9","6.7.9-aikido.8","6.7.9-aikido.10","6.7.9-aikido.9","6.9.0-aikido.10","6.9.4.1-aikido.3","6.4.0-aikido.2","6.9.4.1-aikido.2","6.0.1-aikido.2","6.9.0-aikido.11","6.0.1-aikido.3","6.0.1-aikido.4"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.r5","fixed_in":["6.7.9-aikido.7","6.9.0-aikido.8","6.7.9-aikido.6","6.9.0-aikido.9","6.7.9-aikido.8","6.7.9-aikido.10","6.7.9-aikido.9","6.9.0-aikido.10","6.9.4.1-aikido.3","6.4.0-aikido.2","6.9.4.1-aikido.2","6.0.1-aikido.2","6.9.0-aikido.11","6.0.1-aikido.3","6.0.1-aikido.4"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.dstu3","fixed_in":["6.7.9-aikido.7","6.9.0-aikido.8","6.7.9-aikido.6","6.9.0-aikido.9","6.7.9-aikido.8","6.7.9-aikido.10","6.7.9-aikido.9","6.9.0-aikido.10","6.9.4.1-aikido.3","6.9.0-aikido.11","6.5.27-aikido.1","6.4.0-aikido.2","6.9.4.1-aikido.2","6.0.1-aikido.2","6.0.1-aikido.3","6.0.1-aikido.4"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.r4","fixed_in":["6.7.9-aikido.7","6.9.0-aikido.8","6.7.9-aikido.6","6.9.0-aikido.9","6.7.9-aikido.8","6.7.9-aikido.10","6.7.9-aikido.9","6.9.0-aikido.10","6.9.4.1-aikido.3","6.4.0-aikido.2","6.9.4.1-aikido.2","6.0.1-aikido.2","6.9.0-aikido.11","6.0.1-aikido.3","6.0.1-aikido.4"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"ca.uhn.hapi.fhir:org.hl7.fhir.r4b","fixed_in":["6.7.9-aikido.7","6.9.0-aikido.8","6.7.9-aikido.6","6.9.0-aikido.9","6.7.9-aikido.8","6.7.9-aikido.10","6.7.9-aikido.9","6.9.0-aikido.10","6.9.4.1-aikido.3","6.5.27-aikido.1","6.4.0-aikido.2","6.9.4.1-aikido.2","6.0.1-aikido.2","6.9.0-aikido.11","6.0.1-aikido.3","6.0.1-aikido.4"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"io.root.ca.uhn.hapi.fhir:org.hl7.fhir.dstu2","fixed_in":["6.7.9-root.io.3","6.7.9-root.io.4","6.9.0-root.io.5","6.9.0-root.io.6","6.7.9-root.io.5","6.9.0-root.io.7","6.9.0-root.io.9","6.7.9-root.io.7","6.9.0-root.io.8","6.7.9-root.io.6","6.7.9-root.io.8","6.7.9-root.io.10","6.7.9-root.io.9","6.9.0-root.io.10","6.9.4.1-root.io.3","6.9.0-root.io.11","6.5.27-root.io.1","6.4.0-root.io.2","6.9.4.1-root.io.2","6.0.1-root.io.2","6.0.1-root.io.3","6.0.1-root.io.4"],"sources":["osv"]},{"ecosystem":"Root:Maven","package":"io.root.ca.uhn.hapi.fhir:org.hl7.fhir.validation","fixed_in":["6.7.9-root.io.4","6.9.0-root.io.5","6.9.0-root.io.6","6.7.9-root.io.5","6.9.0-root.io.7","6.7.9-root.io.7","6.9.0-root.io.9","6.9.0-root.io.8","6.7.9-root.io.6","6.7.9-root.io.8","6.7.9-root.io.10","6.7.9-root.io.9","6.9.0-root.io.10","6.9.4.1-root.io.3","6.9.0-root.io.11","6.4.0-root.io.2","6.9.4.1-root.io.2","6.0.1-root.io.2","6.0.1-root.io.3","6.0.1-root.io.4"],"sources":["os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FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint","description":"HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.7, the FHIRPathEngine implementation passes user-controlled regular expressions from matches(), matchesFull(), and replaceMatches() to Java regex operations without effective timeouts, allowing catastrophic backtracking and denial of service. This issue is fixed in version 6.9.7.","status":"published","published":"2026-07-16T16:52:04.901Z","modified":"2026-07-18T03:00:14.087Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T13:46:32.755125Z"}],"euvd":[{"id":"EUVD-2026-44983","description":"HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.7, the FHIRPathEngine implementation passes user-controlled regular expressions from matches(), matchesFull(), and replaceMatches() to Java regex operations without effective timeouts, allowing catastrophic backtracking and denial of service. This issue is fixed in version 6.9.7.","status":"published","published":"2026-07-16T16:52:04Z","modified":"2026-07-18T03:00:14Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T18:19:50.065723Z"}],"ghsa":[{"id":"GHSA-3653-68v6-rq57","title":"HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint","description":"## Summary\n\nAll 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 complexity checks or timeouts. An attacker can send a resource containing an evil regex pattern that causes catastrophic backtracking, exhausting system resources, and causing Denial-of-Service.\n\n## Details\n\nThe vulnerability exists in regex execution in FHIRPathEngine implementations across multiple code modules. For example the org.hl7.fhir.r5 module:\n\n\n**Entry point 1 — `FHIRPathEngine.java:5929` (R5 `funcMatches`):**\n```java\nprivate List\u003cBase\u003e funcMatches(ExecutionContext context, List\u003cBase\u003e focus, ExpressionNode exp) {\n    String sw = convertToString(swb); // attacker-controlled regex pattern\n    // ...\n    Pattern p = Pattern.compile(\"(?s)\" + sw); // VULNERABLE: no complexity check\n    Matcher m = p.matcher(st);                // no timeout\n    boolean ok = m.find();\n```\n\n**Entry point 2 — `FHIRPathEngine.java:5951` (R5 `funcMatchesFull`):**\n```java\nPattern p = Pattern.compile(\"(?s)\" + sw); // VULNERABLE: same pattern\nMatcher m = p.matcher(st);\nboolean ok = m.matches();\n```\n\n**Entry point 3 — `FHIRPathEngine.java:5120` (R5 `funcReplaceMatches`):**\n```java\nresult.add(new StringType(convertToString(focus.get(0))\n    .replaceAll(regex, repl)).noExtensions()); // VULNERABLE: replaceAll uses Pattern internally\n```\n\nThe same vulnerabilities exist in the dstu2, dstu2016may, dstu3, r4, and r4b modules, and the FHIRPathEngine is used in the validation module functionality.\n\n**Why this is exploitable:**\n- No timeout mechanism covers FHIRPath evaluation — the `ValidationTimeout` class only protects `InstanceValidator` operations, not `evaluateFhirPath()`\n- Java's `Pattern.compile()` with a pattern like `(a+)+$` against input `\"aaaaaaaaaaaaaaaaaaaaaa!\"` causes exponential backtracking (O(2^n) time complexity)\n\n\n## Impact\n\n- **CPU Exhaustion:** The exponential backtracking in Java's regex engine consumes 100% of a CPU core for the duration of the hang (effectively infinite for sufficiently long input strings) for callers of FHIRPathEngine.","status":"published","published":"2026-05-18T20:23:54Z","modified":"2026-05-18T20:23:55Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:40:11.298154Z"}],"nvd":[{"id":"CVE-2026-45367","description":"HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.7, the FHIRPathEngine implementation passes user-controlled regular expressions from matches(), matchesFull(), and replaceMatches() to Java regex operations without effective timeouts, allowing catastrophic backtracking and denial of service. This issue is fixed in version 6.9.7.","status":"published","published":"2026-07-16T17:16:56.293Z","modified":"2026-10-24T20:10:00.137Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T14:12:30.250437Z"}],"osv":[{"id":"CVE-2026-45367","title":"HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint","description":"HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.7, the FHIRPathEngine implementation passes user-controlled regular expressions from matches(), matchesFull(), and replaceMatches() to Java regex operations without effective timeouts, allowing catastrophic backtracking and denial of service. This issue is fixed in version 6.9.7.","status":"published","published":"2026-07-16T16:52:04.901Z","modified":"2026-10-28T10:55:20.450336248Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:45:05.525666Z"},{"id":"GHSA-3653-68v6-rq57","title":"HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint","description":"## Summary\n\nAll 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 complexity checks or timeouts. An attacker can send a resource containing an evil regex pattern that causes catastrophic backtracking, exhausting system resources, and causing Denial-of-Service.\n\n## Details\n\nThe vulnerability exists in regex execution in FHIRPathEngine implementations across multiple code modules. For example the org.hl7.fhir.r5 module:\n\n\n**Entry point 1 — `FHIRPathEngine.java:5929` (R5 `funcMatches`):**\n```java\nprivate List\u003cBase\u003e funcMatches(ExecutionContext context, List\u003cBase\u003e focus, ExpressionNode exp) {\n    String sw = convertToString(swb); // attacker-controlled regex pattern\n    // ...\n    Pattern p = Pattern.compile(\"(?s)\" + sw); // VULNERABLE: no complexity check\n    Matcher m = p.matcher(st);                // no timeout\n    boolean ok = m.find();\n```\n\n**Entry point 2 — `FHIRPathEngine.java:5951` (R5 `funcMatchesFull`):**\n```java\nPattern p = Pattern.compile(\"(?s)\" + sw); // VULNERABLE: same pattern\nMatcher m = p.matcher(st);\nboolean ok = m.matches();\n```\n\n**Entry point 3 — `FHIRPathEngine.java:5120` (R5 `funcReplaceMatches`):**\n```java\nresult.add(new StringType(convertToString(focus.get(0))\n    .replaceAll(regex, repl)).noExtensions()); // VULNERABLE: replaceAll uses Pattern internally\n```\n\nThe same vulnerabilities exist in the dstu2, dstu2016may, dstu3, r4, and r4b modules, and the FHIRPathEngine is used in the validation module functionality.\n\n**Why this is exploitable:**\n- No timeout mechanism covers FHIRPath evaluation — the `ValidationTimeout` class only protects `InstanceValidator` operations, not `evaluateFhirPath()`\n- Java's `Pattern.compile()` with a pattern like `(a+)+$` against input `\"aaaaaaaaaaaaaaaaaaaaaa!\"` causes exponential backtracking (O(2^n) time complexity)\n\n\n## Impact\n\n- **CPU Exhaustion:** The exponential backtracking in Java's regex engine consumes 100% of a CPU core for the duration of the hang (effectively infinite for sufficiently long input strings) for callers of FHIRPathEngine.","status":"published","published":"2026-05-18T20:23:54Z","modified":"2026-09-10T03:51:04.763323789Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-1333"],"updated_at":"2026-11-02T15:46:35.406455Z"},{"id":"ROOT-APP-MAVEN-CVE-2026-45367","title":"CVE-2026-45367 in ca.uhn.hapi.fhir:org.hl7.fhir.validation - Patched by Root","description":"Root has patched CVE-2026-45367 in the ca.uhn.hapi.fhir:org.hl7.fhir.validation package for Root:Maven. Multiple fixed versions available.","status":"published","published":"2026-10-05T11:00:40Z","modified":"2026-10-05T11:15:03.00963884Z","updated_at":"2026-11-02T15:53:27.066589Z"}]}}