How severe is CVE-2025-40928?

CVE-2025-40928 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-2025-40928 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-40928?

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-2025-40928 have an EU (EUVD) identifier?

Yes. CVE-2025-40928 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27141.

When was CVE-2025-40928 published?

CVE-2025-40928 was published on 2025-09-08 and last updated on 2026-06-17.

CVE-2025-40928

CVE-2025-40928 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% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-27141
Weakness: CWE-122
Published: 2025-09-08
Last modified: 2026-06-17

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

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
How severe is CVE-2025-40928?: CVE-2025-40928 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-2025-40928 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-40928?: 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-2025-40928 have an EU (EUVD) identifier?: Yes. CVE-2025-40928 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27141.
When was CVE-2025-40928 published?: CVE-2025-40928 was published on 2025-09-08 and last updated on 2026-06-17.

References

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