---
title: "CVE-2026-87933: DaveGamble cJSON - Use After Free"
description: "DaveGamble cJSON <= 1.7.19 contains a use after free vulnerability caused by improper handling in cJSONUtils_MergePatch function in cJSON_Utils.c, letting remote attackers cause memory corruption, exploit requires crafted input."
url: https://panop.io/threat-heartbeat/CVE-2026-87933/
---

# CVE-2026-87933 DaveGamble cJSON - Use After Free

DaveGamble cJSON <= 1.7.19 contains a use after free vulnerability caused by improper handling in cJSONUtils\_MergePatch function in cJSON\_Utils.c, letting remote attackers cause memory corruption, exploit requires crafted input.

CVSS base score 7.3 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.53% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-87933)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Published

10 September 2026

Updated

15 October 2026

Weakness

[CWE-119](https://cwe.mitre.org/data/definitions/119.html)

## Vendor fix

Update to the latest version with the fix applied once the pull request is accepted.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-87933](https://nvd.nist.gov/vuln/detail/CVE-2026-87933)
- [https://github.com/DaveGamble/cJSON/](https://github.com/DaveGamble/cJSON/)
- [https://github.com/DaveGamble/cJSON/issues/1060](https://github.com/DaveGamble/cJSON/issues/1060)
- [https://github.com/DaveGamble/cJSON/pull/1065](https://github.com/DaveGamble/cJSON/pull/1065)
- [https://vuldb.com/cve/CVE-2026-87933](https://vuldb.com/cve/CVE-2026-87933)
- [https://vuldb.com/submit/911136](https://vuldb.com/submit/911136)
- [https://vuldb.com/vuln/401815](https://vuldb.com/vuln/401815)
- [https://vuldb.com/vuln/401815/cti](https://vuldb.com/vuln/401815/cti)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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