CVE-2026-110682

High

Description

Cpanel::JSON::XS versions from 4.42 before 4.80 for Perl let input chunking change the decoded value of top-level numbers in incr_parse. allow_nonref is enabled by default and incr_parse inherits it. A top-level number, true, false or null has no closing delimiter, so the incremental parser decodes whatever has arrived. The bytes 12 decode as one value when read together, but as 1 and then 2 when split across two reads. A peer that can influence read boundaries can change how many messages a stream consumer decodes and what values they carry.

SeverityHigh

CVSS7.5

Exploit probability—

ProductCpanel-json-xs

PublishedOct 19, 2026

First seenOct 19, 2026

Weakness typeCWE-436CWE-436

How to fix

Update

Cpanel-JSON-XS4.80 or later

Patches

github.com/rurban/Cpanel-JSON-XS/commit/f632d6690d82c14cd2d76d648805325201c52b83.patch

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
Cpanel-JSON-XS	4.42 ≤ v < 4.80	4.80

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