How severe is CVE-2026-18397?

CVE-2026-18397 has a CVSS 4.0 base score of 9.4, rated critical severity.

Is CVE-2026-18397 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-18397?

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

When was CVE-2026-18397 published?

CVE-2026-18397 was published on 2026-10-01 and last updated on 2026-10-02.

CVE-2026-18397

CVE-2026-18397 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.4. 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-130.

Key facts

Severity: Critical (CVSS 4.0 base score 9.4)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-130
Published: 2026-10-01
Last modified: 2026-10-02

Description

This vulnerability enables unauthenticated remote code execution (RCE) on a victim's machine by exploiting a combination of cryptographic weaknesses and memory management issues in the SConnect native host component. The attack leverages an unrestricted messaging interface between an attacker-controlled web page and the native host, allowing malicious input to bypass security checks.

Frequently asked questions

What is CVE-2026-18397?: This vulnerability enables unauthenticated remote code execution (RCE) on a victim's machine by exploiting a combination of cryptographic weaknesses and memory management issues in the SConnect native host component. The attack leverages an unrestricted messaging interface between an attacker-controlled web page and the native host, allowing malicious input to bypass security checks.
How severe is CVE-2026-18397?: CVE-2026-18397 has a CVSS 4.0 base score of 9.4, rated critical severity.
Is CVE-2026-18397 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-18397?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-18397 published?: CVE-2026-18397 was published on 2026-10-01 and last updated on 2026-10-02.

References

https://www.thalesgroup.com/en/product-security-incident-response

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CVE-2026-83745 — High (CVSS 8.7): Memory allocation with excessive size value, Improper handling of length parameter inconsistency vulnerability in…

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