With allow_tags, a tagged value's class name and argument array are decoded and passed to the class's THAW method. Both are released only after THAW returns, so a THAW that dies leaves the whole decoded argument structure allocated.
Each rejected document leaks data of a size the sender chooses, so a process that catches the error and keeps running exhausts its memory.
Analysis and contextual insights are available on OpenCVE Cloud.
Vendor Solution
Upgrade to Cpanel-JSON-XS 4.80 or later.
Tracking
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Thu, 29 Oct 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Thu, 29 Oct 2026 17:30:00 +0000
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| Metrics |
cvssV3_1
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Mon, 19 Oct 2026 21:00:00 +0000
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| First Time appeared |
Rurban
Rurban cpanel::json::xs |
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| Vendors & Products |
Rurban
Rurban cpanel::json::xs |
Mon, 19 Oct 2026 18:30:00 +0000
| Type | Values Removed | Values Added |
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| Description | Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded arguments of a tagged value when its THAW method dies in decode_tag. With allow_tags, a tagged value's class name and argument array are decoded and passed to the class's THAW method. Both are released only after THAW returns, so a THAW that dies leaves the whole decoded argument structure allocated. Each rejected document leaks data of a size the sender chooses, so a process that catches the error and keeps running exhausts its memory. | |
| Title | Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded arguments of a tagged value when its THAW method dies in decode_tag | |
| Weaknesses | CWE-401 | |
| References |
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Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-10-29T17:06:21.316Z
Reserved: 2026-10-14T13:26:41.061Z
Link: CVE-2026-110685
Updated: 2026-10-29T17:02:46.634Z
Status : Awaiting Analysis
Published: 2026-10-19T19:17:22.097
Modified: 2026-10-29T17:18:00.723
Link: CVE-2026-110685
No data.
OpenCVE Enrichment
Updated: 2026-10-19T20:45:03Z
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CWE-401
Missing Release of Memory after Effective Lifetime