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CVE-2026-110687high7.5

Cpanel::JSON::XS versions from 4.43 before 4.80 for Perl misorder byte-string keys during canonical encoding in utf16_cmp

Impact

Cpanel::JSON::XS versions 4.43 before 4.80 for Perl misorder byte-string keys during canonical encoding. This weakness may cause the same data to encode to different canonical documents across processes. Local access is required to exploit this weakness.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

What to do

Upgrade to Cpanel-JSON-XS 4.80 or later.

CPANSec guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Vendor not supplied · CPANSec

Cpanel-JSON-XS

1 range
CPANSec version evidence

Package identity

pkg:cpan/Cpanel-JSON-XS

Identity supplied by CPANSec. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.43 → before 4.80

custom versions

unaffected

unknown

Other versions: unaffected

Original source 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.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-110687

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-176 ↗

CWE-176 Improper Handling of Unicode Encoding

CPANSec

Related →
Contributing organizations · 2
CPANSec

Assigning organization

2026-10-19
CISA-ADP

Additional data publisher

2026-10-29

What changed

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References

2 sources
github.com/rurban/Cpanel-JSON-XS/commit/bb9da30b67f637f4d57922f0e043376363f28f0c.patch
patchCPANSec
metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes
release-notesCPANSec