{"id":"UBUNTU-CVE-2026-29036","details":"cJSON versions 1.5.0 through 1.7.19 contain an incorrectly-resolved name or reference vulnerability in the decode_pointer_inplace() function within cJSON_Utils.c that allows unauthenticated attackers to cause JSON Patch operations to target wrong object keys by supplying crafted JSON Pointer escape sequences (~0 or ~1) in patch paths. Attackers can submit malicious RFC 6902 JSON Patch input to applications using cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() to silently corrupt data or delete unintended keys, potentially bypassing authorization controls in applications that rely on JSON Patch for access-controlled data modification.","modified":"2026-08-19T11:02:29Z","published":"2026-08-11T22:17:00Z","upstream":["CVE-2026-29036"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-29036"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-29036"},{"type":"REPORT","url":"https://github.com/DaveGamble/cJSON"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/cjson-wrong-key-modification-via-json-pointer-escape-decoding"}],"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-2026-29036.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_name":"libcjson1","binary_version":"1.7.15-1ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29036.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_name":"libcjson1","binary_version":"1.7.17-1ubuntu0.1~esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-29036.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-2026-29036.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}