CVE-2026-110687 | BDVDB-2026-391503 Detail

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.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-10-19Record published in the CVE List.
2. Version 22026-10-29Most recent update recorded in the CVE List.