Improper Handling of Highly Compressed Data (Data Amplification) Affecting ca.uhn.hapi.fhir:org.hl7.fhir.r5 package, versions [,6.9.11)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published20 Sept 2026
- disclosed17 Sept 2026
- creditsondt99
Introduced: 17 Sep 2026
NewCVE-2026-81875 (opens in a new tab)How to fix?
Upgrade ca.uhn.hapi.fhir:org.hl7.fhir.r5 to version 6.9.11 or higher.
Overview
Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data (Data Amplification) in the inflate() payload processing path. An attacker can exhaust memory or trigger severe garbage-collection pressure by supplying a Smart Health Card JWT with a zip":"DEF" header and a small compressed payload that expands to a very large byte array. The vulnerable code inflates attacker-controlled payload data into memory before JSON parsing, with no decompressed-size limit. In validator services or applications that accept untrusted SHC content, this can lead to request failure, process instability, or OutOfMemoryError and denial of service.