EUVD-2026-80998Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Trivially crafted malformed SHC JWT causes an unauthenticated remote infinite loop exhausting validation workers; pure availability impact, no confidentiality or integrity effect, AV:N conditional on exposed SHC parsing.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.12, SHCParser in org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java can enter an infinite loop while processing attacker-controlled Smart Health Card JWT content whose header contains zip: "DEF" and whose raw-DEFLATE payload is empty or truncated. SHCParser.decodeJWT() reaches SHCParser.inflate(), where Inflater.inflate() can return zero while Inflater.finished() remains false and Inflater.needsInput() is true. The loop also lacks an Inflater.needsDictionary() termination check, SHCParser.decompress() contains the same zero-progress pattern, and ResourceChecker.java can reach SHC parsing during file-format detection. A malformed validation request can pin a JVM worker thread indefinitely, and concurrent requests can exhaust all validation workers. This issue is fixed in version 6.9.12.
AnalysisAI
Denial of service in HAPI FHIR core (org.hl7.fhir.core) before 6.9.12: remote attackers who can reach an endpoint that parses Smart Health Card content can submit a JWT whose header declares zip:"DEF" with an empty or truncated raw-DEFLATE payload, driving SHCParser.decodeJWT() into a non-terminating Inflater loop that pins a JVM worker thread indefinitely. The trigger is unauthenticated and requires no user interaction (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, 7.5), and because each malformed request consumes a validation worker permanently, concurrent submissions can exhaust the entire worker pool and make legitimate FHIR validation unavailable. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the deployed service actually invokes HAPI FHIR's SHCParser on attacker-controlled input - i.e., an exposed FHIR validation endpoint (or a file-format detection path via ResourceChecker) that accepts and parses Smart Health Card JWT content. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but bounded availability-only risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade org.hl7.fhir.core (and any HAPI FHIR distribution that depends on it) to version 6.9.12 or later, which is the fixed release referenced in the GitHub Security Advisory GHSA-gq9c-wmrm-5hvr; the upstream fix is also visible in pull request 2493 and commits d804558bd77372b1629e55a5b901cad3f5134cdc and edd5d8c139e669e39270785f08be7b63aefef24c. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every deployment of HAPI FHIR core (org.hl7.fhir.core) and identify which endpoints parse untrusted Smart Health Card content, directly or via ResourceChecker file-format detection; disable or network-isolate those paths wherever the capability is not required, apply per-client rate limiting on the remainder, and enable alerting on stalled or saturated validation worker threads. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Oracle Java SE 7 Update 6 and earlier contains multiple sandbox bypass vulnerabilities via the ClassFinder and forName m
Remote code execution in IBM Sterling B2B Integrator, Sterling Integrator, and Tivoli Common Reporting allows unauthenti
Java Runtime Environment sandbox bypass via incorrect image channel verification in 2D component allows remote unauthent
Oracle Java SE JDK/JRE 7 and 6 Update 27 and earlier allows remote code execution with complete system compromise throug
JBoss Seam 2 in Red Hat JBoss EAP 4.3.0 fails to sanitize JBoss Expression Language inputs, allowing remote attackers to
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 update 4 and earlier, 6 up
Multiple vulnerabilities in Oracle Java 7 before Update 11 allow remote attackers to execute arbitrary code by (1) using
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 2 and earlier, 6 Up
The WLS Security component in Oracle WebLogic Server 10.3.6.0, 12.1.2.0, 12.1.3.0, and 12.2.1.0 allows remote attackers
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 7 and earlier allow
Remote unauthenticated attackers can execute arbitrary code on Adobe ColdFusion servers through Java deserialization fla
The ExceptionDelegator component in Apache Struts before 2.2.3.1 interprets parameter values as OGNL expressions during
Same weakness CWE-20 – Improper Input Validation
View allSame technique Denial Of Service
View allShare
External POC / Exploit Code
Leaving vuln.today