CVE-2026-110687CWE-176

CVE-2026-110687

published October 19, 2026

CVSS
—
EPSS
0%
Percentile
6.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.00171 · 6.2th percentile
Weakness
CWE-176 · Improper Handling of Unicode Encoding
Published
2026-10-19T23:17Z
References (2)
https://github.com/rurban/Cpanel-JSON-XS/commit/bb9da30b67f637f4d57922f0e043376363f28f0c.patch · 9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes · 9b29abf9-4ab0-4765-b253-1875cd9b441e
EPSS history
Timeline
  • 21 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 19 OCT 18:12Z
    Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl misorder byte-string keys during canonical encoding in utf16_cmp
    cvelistv5
  • 19 OCT 18:12Z
    Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl misorder byte-string keys during canonical encoding in utf16_cmp
    cvelistv5