CVE-2026-110681

Name	CVE-2026-110681
Description	Cpanel::JSON::XS versions before 4.80 for Perl use the parent interpreter's scalars from a parser object cloned into a new ithread. A parser object holds its callbacks and its incremental parse buffer as raw scalar pointers. When a thread is created, these are copied into the new interpreter unchanged, so the child's parser uses, and later frees, scalars that belong to the parent and may already have been freed there. A parser created before a thread starts and used inside it can call freed callbacks, corrupt reference counts and crash the process.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libcpanel-json-xs-perl (PTS)	bookworm, bookworm (security)	4.35-1+deb12u1	vulnerable
	trixie, trixie (security)	4.39-2~deb13u1	vulnerable
	forky	4.51-1	vulnerable
	sid	4.80-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libcpanel-json-xs-perl	source	(unstable)	(unfixed)

Notes

https://lists.security.metacpan.org/cve-announce/msg/44479851/
Fixed by: https://github.com/rurban/Cpanel-JSON-XS/commit/c53eefbaa59c344abd4c71762118da04280987e8 (4.80)