# CVE-2026-110685: libcpanel-json-xs-perl: Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded arguments of a tagged value when its THAW method dies...

CVE-2026-110685 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-110685, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-110685
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0051
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 15, 2026

## Description

Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded arguments of a tagged value when its THAW method dies in decode_tag.  With allow_tags, a tagged value's class name and argument array are decoded and passed to the class's THAW method. Both are released only after THAW returns, so a THAW that dies leaves the whole decoded argument structure allocated.  Each rejected document leaks data of a size the sender chooses, so a process that catches the error and keeps running exhausts its memory.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libcpanel-json-xs-perl Debian 14 | 4.80-1 | [DEBIAN-CVE-2026-110685](https://patchblox.com/security/data/fix/linux/debian-cve-2026-110685.md) | Oct 24, 2026 |
| Linux | perl-Cpanel-JSON-XS Fedora 43 | 4.80-1.fc43 | [FEDORA-2026-4447E52D23](https://patchblox.com/security/data/fix/linux/fedora-2026-4447e52d23.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS amzn 2023 | 4.25-2.amzn2023.0.10 | [ALAS2023-2026-3352](https://patchblox.com/security/data/fix/linux/alas2023-2026-3352.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS opensuse-leap 16.0 | 4.800.0-bp160.1.1 | [OPENSUSE-SU-2026:22187-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22187-1.md) | Nov 7, 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 Fedora 43 | 4.80-1.fc43 | [FEDORA-2026-4447E52D23](https://patchblox.com/security/data/fix/linux/fedora-2026-4447e52d23.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS-debuginfo amzn 2023 | 4.25-2.amzn2023.0.10 | [ALAS2023-2026-3352](https://patchblox.com/security/data/fix/linux/alas2023-2026-3352.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS-debugsource Fedora 43 | 4.80-1.fc43 | [FEDORA-2026-4447E52D23](https://patchblox.com/security/data/fix/linux/fedora-2026-4447e52d23.md) | Nov 7, 2026 |
| Linux | perl-Cpanel-JSON-XS-debugsource amzn 2023 | 4.25-2.amzn2023.0.10 | [ALAS2023-2026-3352](https://patchblox.com/security/data/fix/linux/alas2023-2026-3352.md) | Nov 7, 2026 |

---

Data as of 2026-11-08T13:06:02Z 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.