Is CVE-2026-43002 in the CISA KEV catalog?

No. CVE-2026-43002 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-43002?

CVE-2026-43002 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2026-43002?

CVE-2026-43002 has an EPSS score of 0.36% (28th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43002?

Upgrade horizon on debian unstable to 3:25.7.3-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-43002

MEDIUM

5.3

CVSS v3

NVD

Description

An issue was discovered in OpenStack Horizon 25.6 and 25.7 before 25.7.3. There is a write operation to the session storage backend before authentication and thus storage can be exhausted by unauthenticated requests. This is a regression of the CVE-2014-8124 fix.

CWE-696

How to fix

Remediation Available

horizonDebian

Fixed in:3:25.7.3-1CVE-2026-43002

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

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.36%probability of exploitation in 30 days

28thpercentile

Low risk: more likely to be exploited than 28% of all known CVEs.

References

Other references3

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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 2026-05-07.