CVE-2026-110686 - Cpanel::JSON::XS versions before 4.80 for Perl use freed filter callbacks when a filter removes itself

[Starburst-David]

CVE ID :CVE-2026-110686
Published : Oct. 19, 2026
Description :Cpanel::JSON::XS versions before 4.80 for Perl use freed filter callbacks when a filter removes itself during decoding in decode_hv. A decode copies the parser's filter_json_object and filter_json_single_key_object callbacks without taking references to them. A filter callback that removes the last single-key filter frees the callback table while the decode in progress still uses it. The next object is dispatched through freed memory and can crash the process.