{"answers":{"affected":"6 open source packages ship an affected version, including ca.uhn.hapi.fhir:org.hl7.fhir.r5, ca.uhn.hapi.fhir:org.hl7.fhir.validation and ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81876 exists.","fix":"Upgrade ca.uhn.hapi.fhir:org.hl7.fhir.r5 to 6.9.12 or later.","what":"CVE-2026-81876 is a high-severity denial of service vulnerability in hapifhir org.hl7.fhir.core, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-81876 and fix it if it is affected.\n\nWhat it is: CVE-2026-81876 is a high-severity denial of service vulnerability in hapifhir org.hl7.fhir.core, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-81876 exists.\n\nAffected packages and fixed versions:\n- ca.uhn.hapi.fhir:org.hl7.fhir.r5 (Maven): affected all versions; fixed in 6.9.12\n- ca.uhn.hapi.fhir:org.hl7.fhir.r5 (Maven): affected all versions; fixed in 6.9.12\n- ca.uhn.hapi.fhir:org.hl7.fhir.validation (Maven): affected all versions; fixed in 6.9.12\n- ca.uhn.hapi.fhir:org.hl7.fhir.validation (Maven): affected all versions; fixed in 6.9.12\n- ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli (Maven): affected all versions; fixed in 6.9.12\n- ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli (Maven): affected all versions; fixed in 6.9.12\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-81876/ (Markdown: https://insights.sbomify.com/CVE-2026-81876/index.md)","id":"CVE-2026-81876","markdown":"https://insights.sbomify.com/CVE-2026-81876/index.md","name":"CVE-2026-81876","record":{"aliases":["GHSA-gq9c-wmrm-5hvr","ROOT-APP-MAVEN-CVE-2026-81876"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Java FHIR library","requires_auth":"none","summary":"Attackers can cause a denial of service in HAPI FHIR by sending malformed Smart Health Card JWTs that trigger an infinite loop in the parser.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-835","name":"Loop with Unreachable Exit Condition"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"HAPI FHIR is a complete implementation of the HL7 FHIR standard for healthcare interoperability in Java. Prior to version 6.9.12, SHCParser in org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/elementmodel/SHCParser.java can enter an infinite loop while processing attacker-controlled Smart Health Card JWT content whose header contains zip: \"DEF\" and whose raw-DEFLATE payload is empty or truncated. SHCParser.decodeJWT() reaches SHCParser.inflate(), where Inflater.inflate() can return zero while Inflater.finished() remains false and Inflater.needsInput() is true. The loop also lacks an Inflater.needsDictionary() termination check, SHCParser.decompress() contains the same zero-progress pattern, and ResourceChecker.java can reach SHC parsing during file-format detection. A malformed validation request can pin a JVM worker thread indefinitely, and concurrent requests can exhaust all validation workers. This issue is fixed in version 6.9.12.","ecosystems":["Maven"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"HAPI FHIR: SHCParser DEFLATE infinite loop causes denial of service","id":"CVE-2026-81876","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":6,"n_references":4,"next":{"headline":"radare2: Integer overflow causes heap out-of-bounds write in radare2 PYC parser","id":"CVE-2026-81878"},"packages":[{"ecosystem":"Maven","fixed":["6.9.12"],"introduced":["0"],"last_affected":[],"package":"ca.uhn.hapi.fhir:org.hl7.fhir.r5","purl":null,"source":"GHSA-gq9c-wmrm-5hvr"},{"ecosystem":"Maven","fixed":["6.9.12"],"introduced":["0"],"last_affected":[],"package":"ca.uhn.hapi.fhir:org.hl7.fhir.r5","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.r5","source":"GHSA-gq9c-wmrm-5hvr"},{"ecosystem":"Maven","fixed":["6.9.12"],"introduced":["0"],"last_affected":[],"package":"ca.uhn.hapi.fhir:org.hl7.fhir.validation","purl":null,"source":"GHSA-gq9c-wmrm-5hvr"},{"ecosystem":"Maven","fixed":["6.9.12"],"introduced":["0"],"last_affected":[],"package":"ca.uhn.hapi.fhir:org.hl7.fhir.validation","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.validation","source":"GHSA-gq9c-wmrm-5hvr"},{"ecosystem":"Maven","fixed":["6.9.12"],"introduced":["0"],"last_affected":[],"package":"ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli","purl":null,"source":"GHSA-gq9c-wmrm-5hvr"},{"ecosystem":"Maven","fixed":["6.9.12"],"introduced":["0"],"last_affected":[],"package":"ca.uhn.hapi.fhir:org.hl7.fhir.validation.cli","purl":"pkg:maven/ca.uhn.hapi.fhir/org.hl7.fhir.validation.cli","source":"GHSA-gq9c-wmrm-5hvr"}],"prev":{"headline":"HAPI FHIR: SHCParser unbounded DEFLATE decompression causes denial of service","id":"CVE-2026-81875"},"products":["org.hl7.fhir.core"],"published":"2026-09-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-17","vendors":["hapifhir"]},"summary":"Attackers can cause a denial of service in HAPI FHIR by sending malformed Smart Health Card JWTs that trigger an infinite loop in the parser.","url":"https://insights.sbomify.com/CVE-2026-81876/"}