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CVE-2026-49485

Severity7.5 High CVSS 3.1
Fixed in6.9.9, 6.9.4.2
WeaknessUncontrolled resource consumption (CWE-400)
Published17 Jul 2026
Updated24 Oct 2026

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.

CWE-1333

Exploitation status

No public exploit

No exploit has been reported in the sources we check.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.68% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists: hapifhir/org.hl7.fhir.core 109c888.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/hapifhir/org.hl7.fhir.core/commit/109c88837c032ef399b2eb87ddde86692065cf41 : a commit: the change itself

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 6.9.5 6.9.9 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may 6.9.5 6.9.9 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.dstu3 6.9.5 6.9.9 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.r4 6.9.5 6.9.9 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.r4b 6.9.5 6.9.9 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.r5 6.9.5 6.9.9 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.validation 6.9.5 6.9.9 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli 6.9.5 6.9.9 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.dstu2 0 6.9.4.2 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.dstu2016may 0 6.9.4.2 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.dstu3 0 6.9.4.2 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.r4 0 6.9.4.2 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.r4b 0 6.9.4.2 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.r5 0 6.9.4.2 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.validation 0 6.9.4.2 unbounded
ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli 0 6.9.4.2 unbounded

Products and versions

8 products, 16 version entries
SourceVendorProductSchemeAffected versions
osv ca.uhn.hapi.fhir org.hl7.fhir.dstu2 generic ＜ 6.9.4.2 · ≥ 6.9.5 and ＜ 6.9.9
osv ca.uhn.hapi.fhir org.hl7.fhir.dstu2016may generic ＜ 6.9.4.2 · ≥ 6.9.5 and ＜ 6.9.9
osv ca.uhn.hapi.fhir org.hl7.fhir.dstu3 generic ＜ 6.9.4.2 · ≥ 6.9.5 and ＜ 6.9.9
osv ca.uhn.hapi.fhir org.hl7.fhir.r4 generic ＜ 6.9.4.2 · ≥ 6.9.5 and ＜ 6.9.9
osv ca.uhn.hapi.fhir org.hl7.fhir.r4b generic ＜ 6.9.4.2 · ≥ 6.9.5 and ＜ 6.9.9
osv ca.uhn.hapi.fhir org.hl7.fhir.r5 generic ＜ 6.9.4.2 · ≥ 6.9.5 and ＜ 6.9.9
osv ca.uhn.hapi.fhir org.hl7.fhir.validation generic ＜ 6.9.4.2 · ≥ 6.9.5 and ＜ 6.9.9
osv ca.uhn.hapi.fhir org.hl7.fhir.validation.cli generic ＜ 6.9.4.2 · ≥ 6.9.5 and ＜ 6.9.9

References

URLTags
https://github.com/hapifhir/org.hl7.fhir.core/commit/109c88837c032ef399b2eb87ddde86692065cf41 commit
https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-7cmj-v6x8-frvv WEB
https://github.com/hapifhir/org.hl7.fhir.core PACKAGE
https://github.com/hapifhir/org.hl7.fhir.core/commit/e08982d2b6f6dcd6c670a762d9cf999179fbe4ed
https://github.com/hapifhir/org.hl7.fhir.core/pull/2463
https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.4.2
https://github.com/hapifhir/org.hl7.fhir.core/releases/tag/6.9.9

Timeline
Published2026-07-17By the CVE Program.
NVD record modified2026-10-24NVD's own last-modified date for this record.