CVE-2026-87933: Use After Free in DaveGamble cJSON
CVE-2026-87933 is a use-after-free vulnerability in the cJSON library by DaveGamble, affecting versions 1.7.0 through 1.7.19. The flaw exists in the cJSONUtils_MergePatch function within the cJSON_Utils.c file. This vulnerability can be exploited remotely and an exploit has been publicly disclosed. A fix has been proposed via a pull request but is not yet accepted or officially released.
AI Analysis
Technical Summary
This vulnerability involves a use-after-free condition in the cJSONUtils_MergePatch function of the cJSON library up to version 1.7.19. The issue allows remote attackers to exploit the memory corruption caused by use-after-free, potentially leading to undefined behavior. Although an exploit is publicly available, no official patch or remediation has been released as the fix awaits acceptance in the project repository.
Potential Impact
The vulnerability can be exploited remotely without authentication, potentially leading to memory corruption and undefined behavior. The CVSS 4.0 base score is 6.9 (medium severity), indicating a moderate risk. There is no evidence of active exploitation in the wild at this time.
Mitigation Recommendations
No official patch or remediation is currently available. Users should monitor the project repository for the acceptance of the pending pull request that addresses this issue. Until a fix is released, consider avoiding use of the vulnerable function or applying manual code review and mitigation if feasible.
CVE-2026-87933: Use After Free in DaveGamble cJSON
Description
CVE-2026-87933 is a use-after-free vulnerability in the cJSON library by DaveGamble, affecting versions 1.7.0 through 1.7.19. The flaw exists in the cJSONUtils_MergePatch function within the cJSON_Utils.c file. This vulnerability can be exploited remotely and an exploit has been publicly disclosed. A fix has been proposed via a pull request but is not yet accepted or officially released.
CVSS v4.0
Score 6.9medium
Affected software
pkg:github/davegamble/cJSONcpe:2.3:a:davegamble:cjson:*:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a use-after-free condition in the cJSONUtils_MergePatch function of the cJSON library up to version 1.7.19. The issue allows remote attackers to exploit the memory corruption caused by use-after-free, potentially leading to undefined behavior. Although an exploit is publicly available, no official patch or remediation has been released as the fix awaits acceptance in the project repository.
Potential Impact
The vulnerability can be exploited remotely without authentication, potentially leading to memory corruption and undefined behavior. The CVSS 4.0 base score is 6.9 (medium severity), indicating a moderate risk. There is no evidence of active exploitation in the wild at this time.
Mitigation Recommendations
No official patch or remediation is currently available. Users should monitor the project repository for the acceptance of the pending pull request that addresses this issue. Until a fix is released, consider avoiding use of the vulnerable function or applying manual code review and mitigation if feasible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-09-09T16:21:04.414Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6aa202ecacd9273b4930e00d
Added to database: 09/10/2026, 01:07:56 UTC
Last enriched: 09/10/2026, 01:22:48 UTC
Last updated: 09/10/2026, 02:14:38 UTC
Views: 6
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