CVE-2025-40928
JSON-XS: integer buffer overflow causing a segfault when parsing crafted JSON
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 9, 2025
Updated · June 30, 2026
Description
A flaw was found in the JSON-XS Perl module. A buffer overflow can be triggered due to an integer overflow when a specially crafted JSON input is processed, causing a segmentation fault, crashing the application using the module and resulting in a denial of service.
Statement
Only applications processing JSON input supplied by untrusted users with the JSON-XS Perl module are vulnerable to this issue, limiting the exposure and impact of this vulnerability.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
CVSS / CWE
CVSS 3.1 · 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-122 · Heap-based Buffer Overflow