High severity · published Oct 22, 2026
CVE-2026-113873
SmileCDR HAPI FHIR improper data decompression
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HF
HAPI FHIR · SmileCDR
0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-113873
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-113873
abhinavagarwal07.github.io
https://abhinavagarwal07.github.io/posts/hapi-fhir-authorization-findings/
raw.githubusercontent.com
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-294-01.json
www.cve.org
https://www.cve.org/CVERecord?id=CVE-2026-113873
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