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CVE-2026-62295

HAPI FHIR: JSON utility parser unbounded recursion causes StackOverflow denial of service

Published: Aug 7, 2026Updated: Aug 13, 2026 Sources: CVE List NVDCWE-20
7.5HIGH
NVD MITRE
EPSS Score
0.3%
Top 80.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to 6.9.11, the JSON utility parser in org.hl7.fhir.utilities.json.parser.JsonParser enforces no maximum nesting depth for arrays or objects. As a result, a small but deeply nested, syntactically valid FHIR JSON document can trigger unbounded readArray() or readObject() recursion, raising a StackOverflowError before structural validation runs. An attacker who can submit JSON resources for validation can thus crash the request thread, and services that do not isolate StackOverflowError safely may experience worker loss or process instability — a denial-of-service condition. This issue is fixed in version 6.9.11.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-20CWE-400CWE-674

Affected Products

hapifhir
oss-projectaka hl7 fhir core, org.hl7.fhir.core
org.hl7.fhir.coreOn-prem
OSS Libraries / generic-library
ca.uhn.hapi.fhir:org.hl7.fhir.r5On-prem
OSS Libraries / generic-library
ca.uhn.hapi.fhir:org.hl7.fhir.utilitiesOn-prem
OSS Libraries / generic-library
ca.uhn.hapi.fhir:org.hl7.fhir.validationOn-prem
OSS Libraries / generic-library
ca.uhn.hapi.fhir:org.hl7.fhir.validation.cliOn-prem
OSS Libraries / generic-library

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://github.com/hapifhir/org.hl7.fhir.core/security/advisories/GHSA-2cq7-hg49-56gc
github.com
https://github.com/hapifhir/org.hl7.fhir.core/commit/396f447500407693d6ae1e64db59782862ca7506
github.com

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