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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Affected Vendors & Products
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Solution
Upgrade to Cpanel-JSON-XS 4.80 or later.
Workaround
No workaround given by the vendor.
Mon, 19 Oct 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | 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 | |
| Weaknesses | CWE-401 | |
| References |
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Projects
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-10-19T18:11:53.004Z
Reserved: 2026-10-14T13:24:19.060Z
Link: CVE-2026-110677
Vulnrichment
No data.
NVD
Status : Awaiting Analysis
Published: 2026-10-19T19:17:21.437
Modified: 2026-10-19T20:50:17.967
Link: CVE-2026-110677
Redhat
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OpenCVE Enrichment
Updated: 2026-10-19T19:30:02Z