CVE-2026-29036
CVE-2026-29036 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-706.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v4: 8.7
- EPSS exploit prediction: 0% (18th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-706
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-29036?
- 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.
- How severe is CVE-2026-29036?
- CVE-2026-29036 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
- Is CVE-2026-29036 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-29036?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2026-29036 published?
- CVE-2026-29036 was published on 2026-08-11 and last updated on 2026-08-13.
References
- https://github.com/DaveGamble/cJSON
- https://www.vulncheck.com/advisories/cjson-wrong-key-modification-via-json-pointer-escape-decoding
Other CWE-706 vulnerabilities
- CVE-2026-65816 — Critical (CVSS 10.0): Use of incorrectly-resolved name or reference in Azure Arc allows an unauthorized attacker to elevate privileges over a…
- CVE-2025-65474 — Critical (CVSS 9.8): An arbitrary file rename vulnerability in the /admin/manager.php component of EasyImages 2.0 v2.8.6 and below allows…
- CVE-2024-35198 — Critical (CVSS 9.8): TorchServe is a flexible and easy-to-use tool for serving and scaling PyTorch models in production. TorchServe 's check…
- CVE-2023-31814 — Critical (CVSS 9.8): D-Link DIR-300 firmware <=REVA1.06 and <=REVB2.06 is vulnerable to File inclusion via /model/__lang_msg.php.
- CVE-2022-30258 — Critical (CVSS 9.8): An issue was discovered in Technitium DNS Server through 8.0.2 that allows variant V2 of unintended domain name…
- CVE-2022-30257 — Critical (CVSS 9.8): An issue was discovered in Technitium DNS Server through 8.0.2 that allows variant V1 of unintended domain name…