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CVE-2026-110677high7.5

Cpanel::JSON::XS versions from 4.28 before 4.80 for Perl leak the array collecting duplicate key values under dupkeys_as_arrayref in decode_hv

Impact

Cpanel::JSON::XS versions 4.28 before 4.80 for Perl leak memory when decoding JSON with duplicate keys. An attacker with access to the JSON decoding process may cause memory exhaustion. The weakness is due to a missing release of memory after its effective lifetime.

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

4.28 → before 4.80

custom versions

unaffected

unknown

Other versions: unaffected

Original source description

Cpanel::JSON::XS versions from 4.28 before 4.80 for Perl leak the array collecting duplicate key values under dupkeys_as_arrayref in decode_hv.

With dupkeys_as_arrayref, the values of a duplicate object key are collected into a new array. An extra reference is never released, so the array and every value in it outlive the decoded structure. The array also leaks when decoding fails after a duplicate key.

Repeatedly decoding untrusted JSON with a duplicate key holding a large value exhausts 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-2026-110677

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

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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/edb13030a708afc2cde0d2629fb6bdd31288ce6c.patch
patchCPANSec
metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes
release-notesCPANSec