Bug 2555769 (CVE-2026-110677) - CVE-2026-110677 perl-Cpanel-JSON-XS: perl-cpanel-json-xs: Denial of Service via memory leak when decoding duplicate keys
Summary: CVE-2026-110677 perl-Cpanel-JSON-XS: perl-cpanel-json-xs: Denial of Service v...
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Status: NEW
Alias: CVE-2026-110677
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-19 18:39 UTC by OSIDB Bzimport
Modified: 2026-10-20 14:21 UTC (History)
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Description OSIDB Bzimport 2026-10-19 18:39:34 UTC 
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.
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