{"id":"CVE-2026-29036","summary":"cJSON 1.7.19 Wrong-Key Modification via JSON Pointer Escape Decoding","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":"2026-08-15T16:52:29.607072Z","published":"2026-08-11T21:30:01.779Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-706"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29036.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29036.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29036"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/cjson-wrong-key-modification-via-json-pointer-escape-decoding"},{"type":"PACKAGE","url":"https://github.com/DaveGamble/cJSON"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/davegamble/cjson","events":[{"introduced":"1217ca9e9f0134fe4666b3c81771af545c4c1b9d"},{"fixed":"c859b25da02955fef659d658b8f324b5cde87be3"}],"database_specific":{"extracted_events":[{"introduced":"1.5.0"},{"last_affected":"1.7.19"},{"fixed":"1.7.19"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v1.7.18","v1.7.17","v1.7.16","v1.7.15","v1.7.14","v1.7.13","v1.7.12","v1.7.11","v1.7.10","v1.7.9","v1.7.8","v1.7.7","v1.7.6","v1.7.5","v1.7.4","v1.7.3","v1.7.2","v1.7.1","v1.7.0","v1.6.0","v1.5.9","v1.5.8","v1.5.7","v1.5.6","v1.5.5","v1.5.4","v1.5.3","v1.5.2","v1.5.1","v1.5.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29036.json","vanir_signatures_modified":"2026-08-15T16:52:29Z","vanir_signatures":[{"source":"https://github.com/davegamble/cjson/commit/c859b25da02955fef659d658b8f324b5cde87be3","target":{"file":"cJSON.c"},"deprecated":false,"digest":{"line_hashes":["324212209976151655889958665598298635544","57000550816535391230572611048963131217","217784711622956909858859487036437801772","143000211397577675930366937432594758406"],"threshold":0.9},"id":"CVE-2026-29036-83e2c045","signature_type":"Line","signature_version":"v1"}]}}],"schema_version":"1.9.0","severity":[{"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"}]}