CVE-2026-9516

HIGH EPSS 29.3%
Published Jun 3, 20264w ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Jun 3, 2026 4w ago
Last Modified Jun 17, 2026 1w ago

Description

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. 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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
29.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 2

CWE-755
CWE-763

Affected Products 1

VendorProductVersionRange
rurbancpanel\\ <4.41

References 3

  • openwall.com http://www.openwall.com/lists/oss-security/2026/06/03/5
    Mailing ListPatchThird Party Advisory
  • github.com https://github.com/rurban/Cpanel-JSON-XS/commit/dfe1b41a36caba51dc12a2917fe50285d1ffaa7b.patch
    Patch
  • metacpan.org https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.41/changes
    Release Notes

Remediation

  • openwall.com http://www.openwall.com/lists/oss-security/2026/06/03/5
    Mailing ListPatchThird Party Advisory
  • github.com https://github.com/rurban/Cpanel-JSON-XS/commit/dfe1b41a36caba51dc12a2917fe50285d1ffaa7b.patch
    Patch