Quick answers
- Is CVE-2026-110680 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-110680 being exploited in the wild.
- How severe is CVE-2026-110680?
- Informational severity, published 19 October 2026.
- Which products and versions are affected?
- Cpanel::JSON::XS 4.20 before 4.80.
- Is there a fix for CVE-2026-110680?
- Yes: fixed in Cpanel::JSON::XS 4.80. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-110680 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-110680?
- Check whether you run Cpanel::JSON::XS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: Cpanel::JSON::XS 4.80
Technical details
The vulnerability is an out-of-bounds write in the encode_hv function during canonical JSON encoding of tied or threads::shared hashes. The encoder counts hash keys in one pass then collects them in a second pass, allocating a fixed 64-entry stack array or dynamically sized heap array. If the hash grows between passes, the second pass overwrites memory beyond the allocated buffer. The fix adds a bounds check to detect and reject such unstable hash growth.
Affected products
- CPAN Cpanel::JSON::XS 4.20 before 4.80
Timeline
- 2026-10-19: disclosed
- 2026-10-14: patched: Patch commit 44c4591 merged