CVE-2026-110674

Cpanel::JSON::XS versions from 4.33 before 4.80 for Perl miss duplicate non-ASCII bare keys, allowing type confusion under dupkeys_as_arrayref in decode_hv. With allow_barekey, which relaxed enables, a bare key containing a non-ASCII byte is stored as UTF-8 but looked up as raw bytes, so a repeated key escapes the duplicate-key check and replaces the earlier value. From 4.41, under dupkeys_as_arrayref, a bare repeat replaces the array that collects a key's values with a plain value, and the next quoted repeat pushes onto that value as if it were an array. A JSON integer there is dereferenced as a pointer. Untrusted JSON decoded with relaxed and dupkeys_as_arrayref can crash the process or dereference an address chosen by a JSON number.

• https://github.com/rurban/Cpanel-JSON-XS/commit/c52037857d6a99d96ebd1ce3e2fa769505f028cf.patch

• https://github.com/rurban/Cpanel-JSON-XS/commit/c52037857d6a99d96ebd1ce3e2fa769505f028cf.patch
• https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes
• https://www.cve.org/CVERecord?id=CVE-2026-9334

• UNSCOREDCVE-2026-0314
• HIGHCVE-2026-100792
• MEDIUMCVE-2026-100793
• UNSCOREDCVE-2026-101912PoC
• HIGHCVE-2026-102203
• HIGHCVE-2026-102216
• HIGHCVE-2026-102299
• HIGHCVE-2026-102321

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