Cpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-9516
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-03 01:16:23 UTC
Updated2026-06-05 17:35:52 UTC
DescriptionCpanel::JSON::XS versions before 4.41 for Perl allow denial of service via UTF-8 BOM prefixed input when a decode filter callback throws. To skip a leading 3-byte UTF-8 BOM, decode_json() advances the input scalar's string pointer past the mark with SvPV_set() and restores it only on the normal return path. When decoding aborts through a Perl exception, for example a filter_json_object callback that croaks, the restore is skipped and the scalar is left with its string pointer offset into its own buffer and a shortened length. When that scalar is later freed, the allocator receives an invalid pointer and the interpreter aborts. A single BOM prefixed document decoded with a throwing filter callback crashes any caller.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000490000 probability, percentile 0.157590000 (date 2026-06-10)

Problem Types: CWE-755 | CWE-763 | CWE-763 CWE-763 Release of Invalid Pointer or Reference | CWE-755 CWE-755 Improper Handling of Exceptional Conditions

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Rurban Cpanel \ json\ \ xs

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA RURBAN CpanelJSONXS affected 4.41 custom Not specified

References

ReferenceSourceLinkTags
metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.41/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org Release Notes
github.com/rurban/Cpanel-JSON-XS/commit/dfe1b41a36caba51dc12a2917fe50285... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com Patch
www.openwall.com/lists/oss-security/2026/06/03/5 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory, Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-05-18T00:00:00.000ZIssue reported.
CNA2026-05-27T00:00:00.000ZVersion 4.41 released with fix.
CNA2026-05-28T00:00:00.000ZFix verified.

Solutions

CNA: Upgrade to Cpanel::JSON::XS 4.41 or later.

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