CVE-2026-113873: CWE-409 Improper Handling of Highly Compressed Data (Data Amplification) in SmileCDR HAPI FHIR
Description
CVE-2026-113873 is a vulnerability in SmileCDR HAPI FHIR where the software improperly handles highly compressed data. An unauthenticated attacker can send specially crafted compressed payloads that, when decompressed, exhaust server heap memory or crash certain services. This results in a denial-of-service condition. The vulnerability has a high severity score of 7.5 and affects all versions starting from 0. No patch information is currently available.
CVSS v3.1
Score 7.5high
Affected software
SmileCDR
HAPI FHIR
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
SmileCDR HAPI FHIR does not properly handle highly compressed data, allowing an unauthenticated attacker to send compressed payloads that exhaust server heap or crash certain services when decompressed. This is classified under CWE-409 (Improper Handling of Highly Compressed Data leading to data amplification). The vulnerability can cause denial of service by resource exhaustion. It has a CVSS 3.1 base score of 7.5 with vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating network attack vector, low attack complexity, no privileges or user interaction required, unchanged scope, no confidentiality or integrity impact, but high availability impact.
Potential Impact
An attacker can cause denial of service by sending highly compressed payloads that exhaust server heap memory or crash services in SmileCDR HAPI FHIR. This disrupts availability but does not impact confidentiality or integrity. The attack requires no authentication and can be performed remotely over the network.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting or filtering compressed payloads or applying resource usage limits to mitigate potential denial-of-service conditions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisa-cg
- Date Reserved
- 2026-10-20T20:11:47.271Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ada4f7b4d27ba8daa6dce31
Added to database: 10/22/2026, 18:01:31 UTC
Last enriched: 10/22/2026, 18:15:22 UTC
Last updated: 10/22/2026, 18:16:11 UTC
Views: 15
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