# CVE-2025-40929: libcpanel-json-xs-perl: Cpanel::JSON::XS before version 4.40 for Perl has an integer bufferoverflow causing a segfault when parsing crafted J...

CVE-2025-40929 is fixed in 4 products on 1 platform, first by libcpanel-json-xs-perl 4.27-1ubuntu0.2, released September 8, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-40929
- Priority: Routine
- CVSS: 5.6 (Medium)
- EPSS: 0.0046
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 8, 2025

## Description

Cpanel::JSON::XS before version 4.40 for Perl has an integer bufferoverflow causing a segfault when parsing crafted JSON, enablingdenial-of-service attacks or other unspecified impact

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libcpanel-json-xs-perl Debian 11.6 (bullseye) | 4.25-1+deb11u1 | [DLA-4318-1](https://patchblox.com/security/data/fix/linux/dla-4318-1.md) | Sep 30, 2025 |
| Linux | libcpanel-json-xs-perl Debian 12.15 (bookworm) | 4.35-1+deb12u1 | [DSA-6000-1](https://patchblox.com/security/data/fix/linux/dsa-6000-1.md) | Sep 11, 2025 |
| Linux | libcpanel-json-xs-perl Debian 13.5 (trixie) | 4.39-2~deb13u1 | [DSA-6000-1](https://patchblox.com/security/data/fix/linux/dsa-6000-1.md) | Sep 11, 2025 |
| Linux | libcpanel-json-xs-perl Debian 14 | 4.39-2 | [DEBIAN-CVE-2025-40929](https://patchblox.com/security/data/fix/linux/debian-cve-2025-40929.md) | Sep 8, 2025 |
| Linux | libcpanel-json-xs-perl Ubuntu 22.04.1 LTS (jammy) | 4.27-1ubuntu0.2 | [libcpanel-json-xs-perl 4.27-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libcpanel-json-xs-perl-4.27-1ubuntu0.2.md) | Sep 8, 2025 |
| Linux | libcpanel-json-xs-perl Ubuntu 24.04.5 LTS (noble) | 4.37-1ubuntu0.1 | [libcpanel-json-xs-perl 4.37-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libcpanel-json-xs-perl-4.37-1ubuntu0.1.md) | Sep 8, 2025 |
| Linux | libcpanel-json-xs-perl Ubuntu 25.04 (plucky) | 4.39-1ubuntu0.1 | [libcpanel-json-xs-perl 4.39-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libcpanel-json-xs-perl-4.39-1ubuntu0.1.md) | Jan 16, 2026 |
| Linux | libcpanel-json-xs-perl Ubuntu 25.10 (questing) | 4.39-2 | [libcpanel-json-xs-perl 4.39-2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-libcpanel-json-xs-perl-4.39-2.md) | Sep 8, 2025 |
| Linux | libcpanel-json-xs-perl Ubuntu 26.04.1 LTS (resolute) | 4.39-2 | [libcpanel-json-xs-perl 4.39-2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libcpanel-json-xs-perl-4.39-2.md) | Sep 8, 2025 |
| Linux | perl-Cpanel-JSON-XS amzn 2023 | 4.25-2.amzn2023.0.7 | [ALAS2023-2025-1199](https://patchblox.com/security/data/fix/linux/alas2023-2025-1199.md) | Sep 17, 2025 |
| Linux | perl-Cpanel-JSON-XS opensuse-leap 16.0 | 4.420.0-bp160.1.1 | [OPENSUSE-SU-2026:21140-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21140-1.md) | Jun 19, 2026 |
| Linux | perl-Cpanel-JSON-XS sles 15.7 | 4.800.0-150700.3.9.1 | [SUSE-SU-2026:4926-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4926-1.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS-debuginfo amzn 2023 | 4.25-2.amzn2023.0.7 | [ALAS2023-2025-1199](https://patchblox.com/security/data/fix/linux/alas2023-2025-1199.md) | Sep 17, 2025 |
| Linux | perl-Cpanel-JSON-XS-debugsource amzn 2023 | 4.25-2.amzn2023.0.7 | [ALAS2023-2025-1199](https://patchblox.com/security/data/fix/linux/alas2023-2025-1199.md) | Sep 17, 2025 |

---

Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.