CVE-2026-110677 - Cpanel::JSON::XS versions from 4.28 before 4.80 for Perl leak the array collecting duplicate key value

[Starburst-David]

CVE ID :CVE-2026-110677
Published : Oct. 19, 2026
Description :Cpanel::JSON::XS versions from 4.28 before 4.80 for Perl leak the array collecting duplicate key values under dupkeys_as_arrayref in decode_hv. With dupkeys_as_arrayref, the values of a duplicate object key are collected into a new array. An extra reference is never released, so the array and every value in it outlive the decoded structure. The array also leaks when decoding fails after a duplicate key. Repeatedly decoding untrusted JSON with a duplicate key holding a large value exhausts process memory.