CVE-2026-49485
HAPI FHIR: ReDoS via FHIRPath matches()/replaceMatches() in FHIR Validator HTTP Endpoint
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.9 and 6.9.4.2, all implementations of FHIRPathEngine accept arbitrary FHIRPath expressions and evaluate them without input validation, and the FHIRPath functions matches(), matchesFull(), and replaceMatches() pass user-controlled regular expressions to Java's Pattern.compile() and String.replaceAll() through an incomplete timeout utility. An attacker can send a resource containing an evil regex pattern that causes catastrophic backtracking, exhausting CPU resources and causing denial of service in the FHIR Validator HTTP endpoint and affected org.hl7.fhir.* modules. This issue is fixed in versions 6.9.9 and 6.9.4.2.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.68% · top 47% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
- affected < 6.9.4.2
- affected >= 6.9.5, < 6.9.9
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenca.uhn.hapi.fhir:org.hl7.fhir.dstu2GHSA-7cmj-v6x8-frvv (opens in a new tab)
- Mavenca.uhn.hapi.fhir:org.hl7.fhir.dstu2016mayGHSA-7cmj-v6x8-frvv (opens in a new tab)
- Mavenca.uhn.hapi.fhir:org.hl7.fhir.dstu3GHSA-7cmj-v6x8-frvv (opens in a new tab)
- Mavenca.uhn.hapi.fhir:org.hl7.fhir.r4GHSA-7cmj-v6x8-frvv (opens in a new tab)
- Mavenca.uhn.hapi.fhir:org.hl7.fhir.r4bGHSA-7cmj-v6x8-frvv (opens in a new tab)
- Mavenca.uhn.hapi.fhir:org.hl7.fhir.r5GHSA-7cmj-v6x8-frvv (opens in a new tab)
- Mavenca.uhn.hapi.fhir:org.hl7.fhir.validationGHSA-7cmj-v6x8-frvv (opens in a new tab)
- Mavenca.uhn.hapi.fhir:org.hl7.fhir.validation.cliGHSA-7cmj-v6x8-frvv (opens in a new tab)
References (6)
- https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-7cmj-v6x8-frvv (opens in a new tab)x_refsource_CONFIRM
- https://github.com/hapifhir/org.hl7.fhir.core/pull/2463 (opens in a new tab)x_refsource_MISC
- https://github.com/hapifhir/org.hl7.fhir.core/commit/109c88837c032ef399b2eb87ddde86692065cf41 (opens in a new tab)x_refsource_MISC
- https://github.com/hapifhir/org.hl7.fhir.core/commit/e08982d2b6f6dcd6c670a762d9cf999179fbe4ed (opens in a new tab)x_refsource_MISC
- https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.4.2 (opens in a new tab)x_refsource_MISC
- https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.9 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-7cmj-v6x8-frvv (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-49485)Record last updated .