How severe is CVE-2026-40639?

CVE-2026-40639 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over physical access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-40639 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40639?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40639 have an EU (EUVD) identifier?

Yes. CVE-2026-40639 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35789.

When was CVE-2026-40639 published?

CVE-2026-40639 was published on 2026-06-09 and last updated on 2026-06-17.

CVE-2026-40639

CVE-2026-40639 is a medium-severity vulnerability with a CVSS 3.x base score of 5.7. 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-261.

Key facts

Severity: Medium (CVSS 3.x base score 5.7)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35789
Weakness: CWE-261
Published: 2026-06-09
Last modified: 2026-06-17

Description

Dell Client Platform BIOS contains a Weak Encoding for Password vulnerability. An unauthenticated attacker with physical access could potentially exploit this vulnerability, leading to Elevation of Privileges.

Frequently asked questions

What is CVE-2026-40639?: Dell Client Platform BIOS contains a Weak Encoding for Password vulnerability. An unauthenticated attacker with physical access could potentially exploit this vulnerability, leading to Elevation of Privileges.
How severe is CVE-2026-40639?: CVE-2026-40639 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over physical access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-40639 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40639?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40639 have an EU (EUVD) identifier?: Yes. CVE-2026-40639 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35789.
When was CVE-2026-40639 published?: CVE-2026-40639 was published on 2026-06-09 and last updated on 2026-06-17.

References

https://www.dell.com/support/kbdoc/en-us/000453482/dsa-2026-197

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