cPanel CVE-2026-110673
CVE-2026-110673 is one of a coordinated set of fixes in Cpanel::JSON::XS for Perl: versions before 4.80 — allow stack exhaustion via nested tagged values under allow_tags in decode_tag. 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-674 in the advisory's own data, CVSS 7.5 — practical risk ranges from resource exhaustion to memory corruption.
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.
Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-110673
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What is CVE-2026-110673?
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