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CVE-2026-110672high7.5

Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded key of an object rejected for a duplicate key or a missing colon in decode_hv

Impact

Cpanel::JSON::XS versions before 4.80 for Perl leak decoded keys of rejected objects, potentially exhausting process memory. An attacker with the ability to send repeated requests could exploit this weakness. The impact is memory exhaustion.

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

0 → before 4.80

custom versions

unaffected

unknown

Other versions: unaffected

Original source description

Cpanel::JSON::XS versions before 4.80 for Perl leak the decoded key of an object rejected for a duplicate key or a missing colon in decode_hv.

A quoted key of 24 or more bytes, or one containing a non-ASCII byte or an escape sequence, is decoded into a new scalar. Nothing frees that scalar when the object is rejected for a missing ':' after the key or, from 4.09, for a duplicate key. Duplicate keys are an error unless allow_dupkeys, dupkeys_as_arrayref or relaxed is set.

A process that keeps running after a failed decode retains one key per rejected document, with its size chosen by the sender. Repeated requests exhaust process memory.

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-2026-110672

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-401 ↗

CWE-401 Missing Release of Memory after Effective Lifetime

CPANSec

Related →
Contributing organizations · 2
CPANSec

Assigning organization

2026-10-19
CISA-ADP

Additional data publisher

2026-10-29

What changed

Follow changes
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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/532b53cf8d2ca5ab6bc24048325566d1f7132425.patch
patchCPANSec
metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes
release-notesCPANSec