Is CVE-2026-25834 in the CISA KEV catalog?

No. CVE-2026-25834 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-25834?

CVE-2026-25834 has a CVSS v3 base score of 6.5 (Moderate).

What is the EPSS score for CVE-2026-25834?

CVE-2026-25834 has an EPSS score of 0.14% (3th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-25834?

Upgrade mbedtls on debian unstable to 3.6.6-0.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-25834

MEDIUM

6.5

CVSS v3

NVD

Description

Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.

CWE-295Improper Certificate Validation CWE-327

How to fix

Remediation Available

mbedtlsDebian

Fixed in:3.6.6-0.1CVE-2026-25834

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:U

Exploit Intelligence

0.14%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Vendor Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-05.