libcpanel-json-xs-perl: Cpanel::JSON::XS versions from 4.28 before 4.80 for Perl leak the array collecting duplicate key values under dupkeys...
CVE-2026-110677 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-110677, released October 24, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libcpanel-json-xs-perl · Debian 14 | 4.80-1 | DEBIAN-CVE-2026-110677 | Oct 24, 2026 |
| perl-Cpanel-JSON-XS · Fedora 43 | 4.80-1.fc43 | FEDORA-2026-4447E52D23 | Nov 7, 2026 |
| perl-Cpanel-JSON-XS · opensuse-leap 16.0 | 4.800.0-bp160.1.1 | OPENSUSE-SU-2026:22187-1 | Nov 7, 2026 |
| perl-Cpanel-JSON-XS · sles 15.7 | 4.800.0-150700.3.9.1 | SUSE-SU-2026:4926-1 | Nov 7, 2026 |
| perl-Cpanel-JSON-XS-debuginfo · Fedora 43 | 4.80-1.fc43 | FEDORA-2026-4447E52D23 | Nov 7, 2026 |
| perl-Cpanel-JSON-XS-debugsource · Fedora 43 | 4.80-1.fc43 | FEDORA-2026-4447E52D23 | Nov 7, 2026 |
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