CVE-2026-110673

High

Description

Cpanel::JSON::XS versions before 4.80 for Perl allow stack exhaustion via nested tagged values under allow_tags in decode_tag. With allow_tags, "(" starts a tagged value. Its tag and value are decoded recursively, and each can start another tagged value. Unlike arrays and objects, this nesting is not counted against max_depth. A run of "(" bytes exhausts the C stack and triggers an uncatchable segmentation fault regardless of max_depth.

SeverityHigh

CVSS7.5

Exploit probability—

ProductCpanel-json-xs

PublishedOct 19, 2026

First seenOct 19, 2026

Weakness typeCWE-674CWE-674

How to fix

Update

Cpanel-JSON-XS4.80 or later

Patches

github.com/rurban/Cpanel-JSON-XS/commit/995eb484a9351753e2a8ec3317918b5b4a4e086a.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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