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Vulnerability · Published Sep 10, 2026 · Assigned by VulDB

CVE-2026-87933DaveGamble cJSON cJSON_Utils.c cJSONUtils_MergePatch use after free

High 7.3

In plain English

A high-severity use-after-free in cJSON from DaveGamble. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.5%top 55.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12cjsonno fix listedDEBIAN-CVE-2026-87933
Debian:13cjsonno fix listedDEBIAN-CVE-2026-87933
Debian:14cjsonno fix listedDEBIAN-CVE-2026-87933
Ubuntu:26.04:LTScjsonno fix listedUBUNTU-CVE-2026-87933
Ubuntu:26.10cjsonno fix listedUBUNTU-CVE-2026-87933

Affected products (as reported)

VendorProductVersions
DaveGamble cJSON 1.7.01.7.11.7.21.7.31.7.41.7.51.7.61.7.7

Weakness: CWE-416, CWE-119 · Vector: 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

References