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CVE-2026-87933
DaveGamble cJSON cJSON_Utils.c cJSONUtils_MergePatch use after free
Medium6.9EPSS 0.53%
- Published
- Updated
- Reserved
- Assigned by
- VulDB
Description
A vulnerability was found in DaveGamble cJSON up to 1.7.19. The affected element is the function cJSONUtils_MergePatch of the file cJSON_Utils.c. The manipulation results in use after free. The attack may be launched remotely. The exploit has been made public and could be used. The pull request to fix this issue awaits acceptance.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| VulDBCNA (assigner) | 4.0 | Medium6.9 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P |
| VulDBCNA (assigner) | 3.1 | High7.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| VulDBCNA (assigner) | 3.0 | High7.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R |
| VulDBCNA (assigner) | 2.0 | High7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR |
| NVDNVD · Deferred | 4.0 | Medium5.5 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.53% · top 55% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.9.
Weakness
Affected products
- affected 1.7.0
- affected 1.7.1
- affected 1.7.2
- affected 1.7.3
- affected 1.7.4
- affected 1.7.5
- affected 1.7.6
- affected 1.7.7
- affected 1.7.8
- affected 1.7.9
- affected 1.7.10
- affected 1.7.11
- affected 1.7.12
- affected 1.7.13
- affected 1.7.14
- affected 1.7.15
- affected 1.7.16
- affected 1.7.17
- affected 1.7.18
- affected 1.7.19
References (7)
- VDB-401815 | DaveGamble cJSON cJSON_Utils.c cJSONUtils_MergePatch use after free (opens in a new tab)vdb-entrytechnical-description
- VDB-401815 | CTI Indicators (IOB, IOC, IOA) (opens in a new tab)signaturepermissions-required
- CVE-2026-87933 | CVE Analysis and Report (opens in a new tab)third-party-advisory
- Submit #911136 | DaveGamble cJSON v1.7.19 Use After Free (opens in a new tab)third-party-advisory
- https://github.com/DaveGamble/cJSON/issues/1060 (opens in a new tab)exploitissue-tracking
- https://github.com/DaveGamble/cJSON/pull/1065 (opens in a new tab)issue-trackingpatch
- https://github.com/DaveGamble/cJSON/ (opens in a new tab)product
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-87933)Record last updated .