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CVE-2026-110673                                      CPAN Security Group
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        CVE ID:  CVE-2026-110673

  Distribution:  Cpanel-JSON-XS
      Versions:  before 4.80
      MetaCPAN:  https://metacpan.org/dist/Cpanel-JSON-XS
      VCS Repo:  https://github.com/rurban/Cpanel-JSON-XS

Cpanel::JSON::XS versions before 4.80 for Perl allow stack exhaustion
via nested tagged values under allow_tags in decode_tag

Description
-----------
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.

Problem types
-------------
- CWE-674 Uncontrolled Recursion

Solutions
---------
Upgrade to Cpanel-JSON-XS 4.80 or later.

References
----------
https://github.com/rurban/Cpanel-JSON-XS/commit/995eb484a9351753e2a8ec3317918b5b4a4e086a.patch
https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes

Timeline
--------
- 2026-10-14: Version 4.80 released with fix.