Integer Overflow or Wraparound Affecting cjson package, versions *


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.3% (22nd percentile)

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  • Snyk IDSNYK-DEBIAN12-CJSON-18353646
  • published28 Jul 2026
  • disclosed27 Jul 2026

Introduced: 27 Jul 2026

NewCVE-2026-16554  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

There is no fixed version for Debian:12 cjson.

NVD Description

Note: Versions mentioned in the description apply only to the upstream cjson package and not the cjson package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

cJSON library is vulnerable to an integer overflow in the print_string_ptr() function in cJSON.c on 32-bit platforms. The escape_characters counter, a 32-bit size_t, can wrap around when processing strings containing approximately 858,993,460 or more control characters, causing the output buffer to be allocated based on an underestimated length. When cJSON_PrintBuffered() is used with a pre-allocated buffer, the subsequent write loop overflows the heap allocation. An attacker supplying a crafted JSON string to an application using cJSON on a 32-bit platform can cause a heap buffer overflow, potentially leading to remote code execution, information disclosure, or denial of service.

Because project creator contact attempts were unsuccessful, the vulnerability has only been confirmed in version 1.7.19 but may also affect other versions.

CVSS Base Scores

version 3.1