# CVE-2026-29036

## Summary

- **CVE ID:** CVE-2026-29036
- **Severity:** HIGH
- **CVSS Score:** 8.7 (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)
- **CWE:** CWE-706
- **Published:** Aug 11, 2026
- **Last Modified:** Aug 14, 2026

## Description

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.

## Affected Products

- DaveGamble — cJSON (1.5.0)

## References

- [CNA](https://github.com/DaveGamble/cJSON)
- [CNA](https://www.vulncheck.com/advisories/cjson-wrong-key-modification-via-json-pointer-escape-decoding)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._