CVE-2025-40928

HIGH

Published Sep 8, 2025 Modified Apr 15, 2026 CWE-122

Description

JSON::XS before version 4.04 for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-122 CWE-122

References

Other References

https://metacpan.org/release/MLEHMANN/JSON-XS-4.03/source/XS.xs#L256 https://security.metacpan.org/patches/J/JSON-XS/4.03/CVE-2025-40928-r1.patch http://www.openwall.com/lists/oss-security/2025/09/08/2 https://lists.debian.org/debian-lts-announce/2025/09/msg00033.html

Frequently Asked Questions

What is CVE-2025-40928? +

JSON::XS before version 4.04 for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-40928? +

CVE-2025-40928 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-40928? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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