CVE-2026-81876 HAPI FHIR - Denial of Service

HAPI FHIR < 6.9.12 contains a denial of service caused by an infinite loop in SHCParser when processing malformed Smart Health Card JWTs with empty or truncated raw-DEFLATE payloads, letting attackers exhaust JVM worker threads, exploit requires sending crafted validation requests.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.63% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Update to version 6.9.12 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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