{"id":"UBUNTU-CVE-2026-67215","details":"cJSON through 1.7.19 is vulnerable to uncontrolled recursion leading to stack exhaustion when an untrusted RFC 6902 JSON Patch is applied via cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive(). A patch containing add and copy operations grafts duplicated subtrees to amplify document depth beyond the parser's nesting limit: cJSON_Delete() recurses with no depth bound, and the cJSON_Duplicate() guard CJSON_CIRCULAR_LIMIT is set to 10000, ten times the parser's 1000-level nesting limit and high enough to overflow a default thread stack. An attacker who can supply the patch document can crash the process, resulting in denial of service.","modified":"2026-08-06T03:11:24.467880632Z","published":"2026-07-29T14:16:00Z","upstream":["CVE-2026-67215"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-67215"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-67215"},{"type":"REPORT","url":"https://joshua.hu/cjson-json-parser-cve-vulnerabilities"}],"affected":[{"package":{"name":"cjson","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/cjson?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.10-1.1","1.7.10-1.1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libcjson1","binary_version":"1.7.10-1.1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67215.json"}},{"package":{"name":"cjson","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/cjson?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.14-1","1.7.15-1","1.7.15-1ubuntu0.1~esm2","1.7.15-1ubuntu0.1","1.7.15-1ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.7.15-1ubuntu0.1+esm1","binary_name":"libcjson1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67215.json"}},{"package":{"name":"cjson","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/cjson?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.16-1","1.7.16-2","1.7.17-1","1.7.17-1ubuntu0.1~esm2","1.7.17-1ubuntu0.1~esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.7.17-1ubuntu0.1~esm3","binary_name":"libcjson1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67215.json"}},{"package":{"name":"cjson","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/cjson?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.18-3.1","1.7.18-4","1.7.19-1","1.7.19-2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.7.19-2","binary_name":"libcjson1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67215.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}