CVE-2026-110680 Cpanel::JSON::XS versions from 4.20 before 4.80 for Perl write out of bounds when a tied or shared hash grows during canonical encoding in encode_hv.
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-110680?
CVE-2026-110680 is a vulnerability, published on 19 Oct 2026.
Official description
Cpanel::JSON::XS versions from 4.20 before 4.80 for Perl write out of bounds when a tied or shared hash grows during canonical encoding in encode_hv.
With canonical, the keys of a tied or threads::shared hash are counted before a second pass collects them for sorting. The encoder uses a fixed 64-entry stack array or, for larger counts, a heap array sized from the first pass. If the second pass exceeds that capacity, entries are written out of bounds before the counts are compared.
This corrupts stack or heap memory and can crash the process.
Weakness: CWE-787
Which versions are affected by CVE-2026-110680?
How do I fix CVE-2026-110680?
Upgrade to a fixed version.
Is CVE-2026-110680 being exploited?
There is no known exploitation of CVE-2026-110680 in the wild and no public exploit code.
Sources
Also known as AZL-109866, DEBIAN-CVE-2026-110680, GHSA-7pvv-fpf6-6qmg, UBUNTU-CVE-2026-110680.