CVE-2023-26819 Denial of service in cJSON
Attackers can cause denial of service in applications using cJSON by submitting crafted JSON documents with large numeric values.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-26819?
CVE-2023-26819 is a low-severity denial of service vulnerability in cJSON, published on 19 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
cJSON 1.7.15 might allow a denial of service via a crafted JSON document such as {"a": true, "b": [ null,9999999999999999999999999999999999999999999999912345678901234567]}.
Weakness: CWE-440
Which versions are affected by CVE-2023-26819?
It affects 1 product.
Products include Cjson Project Cjson.
How do I fix CVE-2023-26819?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-26819 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-26819 exists.
Other vulnerabilities in cJSON
Sources
Also known as AZL-60883, AZL-60889, DEBIAN-CVE-2023-26819, GHSA-whx8-2789-8w4w, OESA-2025-1965, OESA-2025-1992 and 4 more.