What’s Vulnerable › Vulnerabilities

CVE-2025-40930: JSON::SIMD before version 1.07 and earlier for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-08 · updated 2026-06-17
• Weakness: CWE-122

Description

JSON::SIMD before version 1.07 and earlier for Perl has an integer buffer overflow causing a segfault when parsing crafted JSON, enabling denial-of-service attacks or other unspecified impact.

Affected products

• PJUHASZ JSON::SIMD: before 1.07 — fixed in 1.07

How to fix

Upgrade to a fixed version: PJUHASZ JSON::SIMD 1.07. Check the vendor advisory for mitigations.

References

• https://github.com/pjuhasz/JSON-SIMD/commit/9a87de7331c9fa5198cae404a83b17649cf7b918.patch
• https://metacpan.org/release/PJUHASZ/JSON-SIMD-1.06/source/SIMD.xs#L248
• https://metacpan.org/release/PJUHASZ/JSON-SIMD-1.07/changes
• http://www.openwall.com/lists/oss-security/2025/09/08/3

Get alerted when CVE-2025-40930 or the next vulnerability affects your stack