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. 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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/rurban/Cpanel-JSON-XS/commit/bb9da30b67f637f4d57922f0e043376363f28f0c.patch
https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes

Configurations

No configuration.

History

29 Oct 2026, 18:17

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5

19 Oct 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-19 19:17

Updated : 2026-10-29 18:17

NVD link : CVE-2026-110687

Mitre link : CVE-2026-110687

CVE.ORG link : CVE-2026-110687

JSON object : View

Products Affected

No product.

CWE

CWE-176

Improper Handling of Unicode Encoding

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