CPANSA-Cpanel-JSON-XS-2026-110675: Cpanel-JSON-XS vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-10-19T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-10-19T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | 8.1 | Severity | High |
| Original language | Language | en | |
| Also referred to | |||
Vulnerability Description
Cpanel::JSON::XS versions from 4.33 before 4.80 for Perl accept malformed UTF-8 in bare hash keys under allow_barekey in decode_hv.
With utf8 and allow_barekey, which relaxed enables, a quoted key is validated as UTF-8 but a bare key's bytes are stored as a UTF-8 flagged string without any check. Malformed UTF-8, control bytes and backslashes reach the decoded hash, while malformed UTF-8 and control bytes in a quoted key or a value are rejected.
Later operations on the key, including lc, uc or encoding the hash again, die with a malformed UTF-8 error.
Vulnerabilities
CVE-2026-110675
Vulnerability DescriptionCpanel::JSON::XS versions from 4.33 before 4.80 for Perl accept malformed UTF-8 in bare hash keys under allow_barekey in decode_hv.
With utf8 and allow_barekey, which relaxed enables, a quoted key is validated as UTF-8 but a bare key's bytes are stored as a UTF-8 flagged string without any check. Malformed UTF-8, control bytes and backslashes reach the decoded hash, while malformed UTF-8 and control bytes in a quoted key or a value are rejected.
Later operations on the key, including lc, uc or encoding the hash again, die with a malformed UTF-8 error.
| Weakness | CWE-1286 : Improper Validation of Syntactic Correctness of Input |
|---|
Product status
Known affected
| Product | Score | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Cpanel-JSON-XS greater than or equal 4.33 and less than 4.80 |
|
Fixed
- Cpanel-JSON-XS greater than or equal 4.80
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-Cpanel-JSON-XS-2026-110675 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-cpanel-json-xs-2026-110675.json - https://github.com/rurban/Cpanel-JSON-XS/commit/c2cd02281b9d6904ca0aff2740154e742abc070c.patch external
https://github.com/rurban/Cpanel-JSON-XS/commit/c2cd02281b9d6904ca0aff2740154e742abc070c.patch - https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes external
https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes - CVE-2026-110675 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-110675
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Mon Oct 19 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/