Bug 2555755 (CVE-2026-110673) - CVE-2026-110673 perl-Cpanel-JSON-XS: Stack exhaustion via nested tagged values under allow_tags
Summary: CVE-2026-110673 perl-Cpanel-JSON-XS: Stack exhaustion via nested tagged value...
Keywords:
Status: NEW
Alias: CVE-2026-110673
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2556463 2556464
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-19 18:32 UTC by OSIDB Bzimport
Modified: 2026-10-20 20:47 UTC (History)
0 users

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Description OSIDB Bzimport 2026-10-19 18:32:51 UTC 
Cpanel::JSON::XS versions before 4.80 for Perl allow stack exhaustion via nested tagged values under allow_tags in decode_tag.

With allow_tags, "(" starts a tagged value. Its tag and value are decoded recursively, and each can start another tagged value. Unlike arrays and objects, this nesting is not counted against max_depth.

A run of "(" bytes exhausts the C stack and triggers an uncatchable segmentation fault regardless of max_depth.
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