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Ubuntu 25.10 cJSON Important DoS Memory Access Vuln 7973-1 CVE-2023-26819

ubuntu
Calendar Grey January 26, 2026
Dist Ubuntu Esm H88
Multiple security issues exist in cJSON, affecting various Ubuntu versions. Ensure your system is updated to mitigate risks.
Several security issues were fixed in cJSON.

Summary

Several security issues were fixed in cJSON.

Software Description:

- cjson: Ultralightweight JSON parser in ANSI C

Details:

It was discovered that cJSON incorrectly handled parsing large numbers. An

attacker could possibly use this issue to cause a denial of service.

(CVE-2023-26819)

It was discovered that cJSON may perform out-of-bounds read when processing

specially crafted JSON files using parse_object. An attacker could possibly

use this issue to expose sensitive information or crash the program.

(CVE-2023-53154)

It was discovered that cJSON incorrectly validated array indices in JSON

pointers, which could result in an out-of-bounds memory access. An attacker

could possibly use this issue to cause a denial of service, or execute

arbitrary code. (CVE-2025-57052)

Topics%20covered

Topics Covered

security advisory DoS Ubuntu important memory access cjson

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  libcjson1                       1.7.18-3.1ubuntu0.1

Ubuntu 24.04 LTS
  libcjson1                       1.7.17-1ubuntu0.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  libcjson1                       1.7.15-1ubuntu0.1

Ubuntu 20.04 LTS
  libcjson1                       1.7.10-1.1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7973-1

CVE-2023-26819, CVE-2023-53154, CVE-2025-57052

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7973-1

Topics%20covered

Topics Covered

security advisory DoS Ubuntu important memory access cjson

Package Information

https://launchpad.net/ubuntu/+source/cjson/1.7.15-1ubuntu0.1

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