CVE-2025-40929 Integer overflow in Cpanel::JSON::XS
An integer buffer overflow in the Cpanel::JSON::XS Perl library allows attackers to cause a denial of service via crafted JSON input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-40929?
CVE-2025-40929 is a medium-severity vulnerability in RURBAN Cpanel::JSON::XS, published on 8 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Cpanel::JSON::XS before version 4.40 for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact
Weakness: CWE-122
Which versions are affected by CVE-2025-40929?
Linux distribution packages (2)
perl-Cpanel-JSON-XS SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 4.380.0-150700.3.3.1 |
perl-Cpanel-JSON-XS openSUSE:Tumbleweed | All versions | 4.400.0-1.1 |
How do I fix CVE-2025-40929?
Upgrade to a fixed version.
Is CVE-2025-40929 being exploited?
There is no known exploitation of CVE-2025-40929 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2025-40929, AZL-67086, AZL-67088, DEBIAN-CVE-2025-40929, DLA-4318-1, DSA-6000-1 and 8 more.