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CVE-2026-110685                                      CPAN Security Group
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        CVE ID:  CVE-2026-110685

  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 leak the decoded
arguments of a tagged value when its THAW method dies in decode_tag

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.

Problem types
-------------
- CWE-401 Missing Release of Memory after Effective Lifetime

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

References
----------
https://github.com/rurban/Cpanel-JSON-XS/commit/9ab010221c069a7af9ef7463454ecd3b8ace9c58.patch
https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes

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