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CVE-2025-40929

Good to know:

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Date: September 8, 2025

Cpanel::JSON::XS before version 4.40 for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact

Severity Score

Related Resources (7)

https://github.com/rurban/Cpanel-JSON-XS/commit/378236219eaa35742c3962ecbdee364903b0a1f2.patch
https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.39/source/XS.xs#L713
https://nvd.nist.gov/vuln/detail/CVE-2025-40929
https://security.alpinelinux.org/vuln/CVE-2025-40929
https://metacpan.org/release/RURBAN/Cpanel-JSON-XS-4.40/changes
https://security-tracker.debian.org/tracker/CVE-2025-40929
https://www.mend.io/vulnerability-database/CVE-2025-40929

Severity Score

Weakness Type (CWE)

Heap-based Buffer Overflow

CWE-122

Top Fix

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Upgrade Version

Upgrade to version https://github.com/rurban/Cpanel-JSON-XS.git - 4.40

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): LOW

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