CVE-2026-29036

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-29036
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29036.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-29036
Downstream
Published
2026-08-11T21:30:01Z
Modified
2026-08-15T16:52:29Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
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.

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

Affected packages

Git / github.com/davegamble/cjson

Affected ranges

Type
GIT
Repo
https://github.com/davegamble/cjson
Events
Introduced
1217ca9e9f0134fe4666b3c81771af545c4c1b9d
Fixed
c859b25da02955fef659d658b8f324b5cde87be3
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "1.5.0"
        },
        {
            "last_affected": "1.7.19"
        },
        {
            "fixed": "1.7.19"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ]
}

Affected versions

v1.*
v1.5.0
v1.5.1
v1.5.2
v1.5.3
v1.5.4
v1.5.5
v1.5.6
v1.5.7
v1.5.8
v1.5.9
v1.6.0
v1.7.0
v1.7.1
v1.7.10
v1.7.11
v1.7.12
v1.7.13
v1.7.14
v1.7.15
v1.7.16
v1.7.17
v1.7.18
v1.7.2
v1.7.3
v1.7.4
v1.7.5
v1.7.6
v1.7.7
v1.7.8
v1.7.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29036.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "324212209976151655889958665598298635544",
                "57000550816535391230572611048963131217",
                "217784711622956909858859487036437801772",
                "143000211397577675930366937432594758406"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-29036-83e2c045",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/davegamble/cjson/commit/c859b25da02955fef659d658b8f324b5cde87be3",
        "target": {
            "file": "cJSON.c"
        }
    }
]
vanir_signatures_modified 
"2026-08-15T16:52:29Z"