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CVE-2026-110682high7.5

Cpanel::JSON::XS versions from 4.42 before 4.80 for Perl let input chunking change the decoded value of top-level numbers in incr_parse

Impact

Cpanel::JSON::XS versions 4.42 before 4.80 for Perl are vulnerable to input chunking, which can change the decoded value of top-level numbers. A peer with influence over read boundaries can exploit this. The impact is uncertain.

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

4.42 → before 4.80

custom versions

unaffected

unknown

Other versions: unaffected

Original source description

Cpanel::JSON::XS versions from 4.42 before 4.80 for Perl let input chunking change the decoded value of top-level numbers in incr_parse.

allow_nonref is enabled by default and incr_parse inherits it. A top-level number, true, false or null has no closing delimiter, so the incremental parser decodes whatever has arrived. The bytes 12 decode as one value when read together, but as 1 and then 2 when split across two reads.

A peer that can influence read boundaries can change how many messages a stream consumer decodes and what values they carry.

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-2026-110682

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-436 ↗

CWE-436 Interpretation Conflict

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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Large field values are marked as truncated previews. Original source snapshots remain retained.

References

2 sources
github.com/rurban/Cpanel-JSON-XS/commit/f632d6690d82c14cd2d76d648805325201c52b83.patch
patchCPANSec
metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes
release-notesCPANSec