CVE-2026-110685

Critical

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.

SeverityCritical

CVSS9.1

Exploit probability—

ProductCpanel-json-xs

PublishedOct 19, 2026

First seenOct 19, 2026

Weakness typeCWE-401CWE-401

How to fix

Update

Cpanel-JSON-XS4.80 or later

Patches

github.com/rurban/Cpanel-JSON-XS/commit/9ab010221c069a7af9ef7463454ecd3b8ace9c58.patch

Vendor advisories

metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes

Affected products

Product	Affected versions	Fixed in
Cpanel-JSON-XS	v < 4.80	4.80

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