cPanel CVE-2026-110682
CVE-2026-110682 is one of a coordinated set of fixes in Cpanel::JSON::XS for Perl: versions before 4.80 — let input chunking change the decoded value of top-level numbers in incr_parse. The corrected build is Cpanel::JSON::XS 4.80, delivered to cPanel & WHM servers through the standard update channel.
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Parsing untrusted JSON with the affected Cpanel::JSON::XS builds is the exposure: CWE-436 in the advisory's own data, CVSS 7.5 — practical risk ranges from resource exhaustion to memory corruption.
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.
Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-110682
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What is CVE-2026-110682?
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