# CVE-2026-113873: SmileCDR HAPI FHIR decompression denial of service

Source: https://junglewise.ai/threats/cve-2026-113873-smilecdr-hapi-fhir-does-not-properly-handle-highly-compressed  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-22. Updated: 2026-10-22  
License: CC BY 4.0 with a link back

CVE-2026-113873 · Severity: high · CVSS 7.5 · Published 2026-10-22

SmileCDR HAPI FHIR is a healthcare interoperability framework used to manage and exchange medical records and patient data. An unauthenticated attacker can send specially compressed payloads that consume excessive server memory or crash the service when decompressed, causing outages and disrupting patient data access.

Technologies: [SmileCDR HAPI FHIR](https://junglewise.ai/threats/technologies/smilecdr-hapi-fhir). Vendors: [SmileCDR](https://junglewise.ai/threats/vendors/smilecdr).

## Quick answers

**Is CVE-2026-113873 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-113873 being exploited in the wild.

**How severe is CVE-2026-113873?** High severity, with a CVSS score of 7.5, published 22 October 2026.

**Which products and versions are affected?** SmileCDR HAPI FHIR <September 2026.

**Is there a fix for CVE-2026-113873?** Yes: fixed in September 2026 and later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-113873 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-113873?** Check whether you run SmileCDR HAPI FHIR at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in September 2026 and later

## Technical details

The vulnerability is a decompression bomb attack where improper handling of highly compressed data allows unauthenticated attackers to exhaust server heap memory or trigger service crashes. The attack requires only network access and no authentication or user interaction, making it a straightforward denial-of-service vector against exposed HAPI FHIR instances.

## Affected products

- SmileCDR HAPI FHIR <September 2026

## Timeline

- 2026-10-22: disclosed

## References

- [https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-294-01.json](https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-294-01.json)
- [https://www.cve.org/CVERecord?id=CVE-2026-113873](https://www.cve.org/CVERecord?id=CVE-2026-113873)

## Related threats

- [SmileCDR HAPI FHIR authorization bypass in conditional create](https://junglewise.ai/threats/cve-2026-113876-smilecdr-hapi-fhir-does-not-correctly-check-authorization-for)
- [SmileCDR HAPI FHIR partition isolation bypass](https://junglewise.ai/threats/cve-2026-113874-smilecdr-hapi-fhir-allows-an-untrusted-bundle-body-to-replace-a)