cPanel CVE-2026-110675
CVE-2026-110675 is one of a coordinated set of fixes in Cpanel::JSON::XS for Perl: versions before 4.80 — accept malformed utf-8 in bare hash keys under allow_barekey in decode_hv. 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-1286 in the advisory's own data, CVSS 8.1 — practical risk ranges from resource exhaustion to memory corruption.
Cpanel::JSON::XS versions from 4.33 before 4.80 for Perl accept malformed UTF-8 in bare hash keys under allow_barekey in decode_hv.
With utf8 and allow_barekey, which relaxed enables, a quoted key is validated as UTF-8 but a bare key’s bytes are stored as a UTF-8 flagged string without any check. Malformed UTF-8, control bytes and backslashes reach the decoded hash, while malformed UTF-8 and control bytes in a quoted key or a value are rejected.
Later operations on the key, including lc, uc or encoding the hash again, die with a malformed UTF-8 error.
Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-110675
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