CVE-2026-110687

HIGH

7.5

CVSS v3

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.

CWE-176

How to fix

Remediation Available

libcpanel-json-xs-perlDebian

Fixed in:4.80-1CVE-2026-110687

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.17%probability of exploitation in 30 days

6thpercentile

Low risk: more likely to be exploited than 6% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-176 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2026-48618	Medium	6.5	3.1%	-	Fix
CVE-2024-24691	Critical	9.6	1.7%	-	Fix
CVE-2023-39213	Critical	9.6	1.4%	-	Fix
CVE-2026-105241	Medium	5.3	0.8%	-	Fix
CVE-2024-47611	Unscored	-	0.8%	-	-
CVE-2026-45062	High	8.1	0.7%	-	-

Common questions

How do I fix CVE-2026-110687?

Upgrade libcpanel-json-xs-perl on debian unstable to 4.80-1 or later.

Is CVE-2026-110687 being actively exploited?

Not that we know of. CVE-2026-110687 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.17% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.

How severe is CVE-2026-110687?

CVE-2026-110687 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-110687 affect?

Published advisories record a fix for libcpanel-json-xs-perl (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-29.