How severe is CVE-2026-27623?

CVE-2026-27623 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-27623 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27623?

CVE-2026-27623 affects Lfprojects Valkey. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27623?

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.

Does CVE-2026-27623 have an EU (EUVD) identifier?

Yes. CVE-2026-27623 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7509.

When was CVE-2026-27623 published?

CVE-2026-27623 was published on 2026-02-23 and last updated on 2026-06-30.

CVE-2026-27623

CVE-2026-27623 is a high-severity vulnerability in Lfprojects Valkey with a CVSS 3.x base score of 7.5. 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7509
Weakness: CWE-20
Affected product: Lfprojects Valkey
Published: 2026-02-23
Last modified: 2026-06-30

Description

Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious actor with network access to Valkey can cause the system to abort by triggering an assertion. When processing incoming requests, the Valkey system does not properly reset the networking state after processing an empty request. A malicious actor can then send a request that the server incorrectly identifies as breaking server side invariants, which results in the server shutting down. Version 9.0.3 fixes the issue. As an additional mitigation, properly isolate Valkey deployments so that only trusted users have access.

Frequently asked questions

What is CVE-2026-27623?: Valkey is a distributed key-value database. Starting in version 9.0.0 and prior to version 9.0.3, a malicious actor with network access to Valkey can cause the system to abort by triggering an assertion. When processing incoming requests, the Valkey system does not properly reset the networking state after processing an empty request. A malicious actor can then send a request that the server incorrectly identifies as breaking server side invariants, which results in the server shutting down. Version 9.0.3 fixes the issue. As an additional mitigation, properly isolate Valkey deployments so that only trusted users have access.
How severe is CVE-2026-27623?: CVE-2026-27623 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-27623 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27623?: CVE-2026-27623 affects Lfprojects Valkey. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27623?: 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.
Does CVE-2026-27623 have an EU (EUVD) identifier?: Yes. CVE-2026-27623 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7509.
When was CVE-2026-27623 published?: CVE-2026-27623 was published on 2026-02-23 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:lfprojects:valkey:*:*:*:*:*:*:*:*

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