CPANSA-Cpanel-JSON-XS-2026-110682: 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 | 7.5 | Severity | High |
| Original language | Language | en | |
| Also referred to | |||
Vulnerability Description
Cpanel::JSON::XS versions from 4.42 before 4.80 for Perl let input chunking change the decoded value of top-level numbers in incr_parse.
allow_nonref is enabled by default and incr_parse inherits it. A top-level number, true, false or null has no closing delimiter, so the incremental parser decodes whatever has arrived. The bytes 12 decode as one value when read together, but as 1 and then 2 when split across two reads.
A peer that can influence read boundaries can change how many messages a stream consumer decodes and what values they carry.
Vulnerabilities
CVE-2026-110682
Vulnerability DescriptionCpanel::JSON::XS versions from 4.42 before 4.80 for Perl let input chunking change the decoded value of top-level numbers in incr_parse.
allow_nonref is enabled by default and incr_parse inherits it. A top-level number, true, false or null has no closing delimiter, so the incremental parser decodes whatever has arrived. The bytes 12 decode as one value when read together, but as 1 and then 2 when split across two reads.
A peer that can influence read boundaries can change how many messages a stream consumer decodes and what values they carry.
| Weakness | CWE-436 : Interpretation Conflict |
|---|
Product status
Known affected
| Product | Score | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Cpanel-JSON-XS greater than or equal 4.42 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-2026-110682 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-cpanel-json-xs-2026-110682.json - https://github.com/rurban/Cpanel-JSON-XS/commit/f632d6690d82c14cd2d76d648805325201c52b83.patch external
https://github.com/rurban/Cpanel-JSON-XS/commit/f632d6690d82c14cd2d76d648805325201c52b83.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-2026-110682 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-110682
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/