How severe is CVE-2025-40930?

CVE-2025-40930 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-40930 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-40930?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-40930 have an EU (EUVD) identifier?

Yes. CVE-2025-40930 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27139.

When was CVE-2025-40930 published?

CVE-2025-40930 was published on 2025-09-08 and last updated on 2026-06-17.

CVE-2025-40930

CVE-2025-40930 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-27139
Weakness: CWE-122
Published: 2025-09-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-40930?: CVE-2025-40930 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-40930 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-40930?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-40930 have an EU (EUVD) identifier?: Yes. CVE-2025-40930 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27139.
When was CVE-2025-40930 published?: CVE-2025-40930 was published on 2025-09-08 and last updated on 2026-06-17.

References

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