What is CVE-2025-40930?

CVE-2025-40930 is a high-severity vulnerability in Pjuhasz Json::simd, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-09-08.

How severe is CVE-2025-40930?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-40930 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Pjuhasz Json::simd

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.

Vulnerability class: Buffer Overflow

EPSS: 0.006 (45.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Pjuhasz Json::simd — versions 0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

9b29abf9-4ab0-4765-b253-1875cd9b441e (related)
9b29abf9-4ab0-4765-b253-1875cd9b441e (release-notes)
9b29abf9-4ab0-4765-b253-1875cd9b441e (patch)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2025-40930?: CVE-2025-40930 is a high-severity vulnerability in Pjuhasz Json::simd, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2025-09-08.
How severe is CVE-2025-40930?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-40930 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.