How severe is CVE-2026-42958?

CVE-2026-42958 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-42958 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42958?

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.

When was CVE-2026-42958 published?

CVE-2026-42958 was published on 2026-07-07 and last updated on 2026-07-08.

CVE-2026-42958

CVE-2026-42958 is a high-severity vulnerability with a CVSS 3.x base score of 7.8. 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-416.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 8.4
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Published: 2026-07-07
Last modified: 2026-07-08

Description

The application contains a use-after-free vulnerability that can be exploited to cause memory corruption while parsing specially crafted files. This could allow an attacker to execute arbitrary code in the context of the current process.

Frequently asked questions

What is CVE-2026-42958?: The application contains a use-after-free vulnerability that can be exploited to cause memory corruption while parsing specially crafted files. This could allow an attacker to execute arbitrary code in the context of the current process.
How severe is CVE-2026-42958?: CVE-2026-42958 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-42958 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42958?: 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.
When was CVE-2026-42958 published?: CVE-2026-42958 was published on 2026-07-07 and last updated on 2026-07-08.

References

https://www.cisa.gov/news-events/ics-advisories/icsa-26-188-06

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