CVE-2026-110687
Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl misorder byte-string keys during canonical encoding in utf16_cmp
- State
- Published
- Severity
- 7.5 High
- Published
- Oct 19, 2026
- Updated
- Oct 29, 2026
- Reserved
- Oct 14, 2026
Description
Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl misorder byte-string keys during canonical encoding in utf16_cmp.
canonical sorts keys by UTF-16 code units. When any key in a hash is UTF-8 flagged, every key is decoded as UTF-8 for the comparison, including byte-string keys that the encoder writes out as Latin-1 characters. A byte-string key whose bytes are valid UTF-8 is sorted out of order, and two keys that encode differently can compare equal and are left in hash order.
The same data can encode to different canonical documents across processes.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | CISA-ADP |
Weaknesses
- CWE-176 Improper Handling of Unicode Encoding
Affected Products
| Product | Versions |
|---|---|
Cpanel-JSON-XS |
|
References
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