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CVE-2026-110684high8.1

Cpanel::JSON::XS versions from 3.0202 before 4.80 for Perl leak memory and retain overloaded objects when encoding values as strings in encode_stringify

Impact

Cpanel::JSON::XS versions from 3.0202 before 4.80 for Perl leak memory and retain overloaded objects when encoding values as strings. The weakness is due to missing release of memory after effective lifetime. Repeated encoding grows process memory without bound.

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

3.0202 → before 4.80

custom versions

unaffected

unknown

Other versions: unaffected

Original source description

Cpanel::JSON::XS versions from 3.0202 before 4.80 for Perl leak memory and retain overloaded objects when encoding values as strings in encode_stringify.

encode_stringify writes a value in its string form under allow_stringify, under convert_blessed for objects without TO_JSON, and under allow_bignum. For an array or hash object with a "" overload, and from 4.20 a scalar object, it takes an extra reference that is never released, so the object and everything it references are never freed. From 4.10 it also never frees its copy of the string.

Repeatedly encoding data that contains such values grows process memory without bound.

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-2026-110684

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/5b15916b5e7841e447664ace51fb50c12d1e0f39.patch
patchCPANSec
metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.80/changes
release-notesCPANSec