CVE-2026-27623: CWE-20: Improper Input Validation in valkey-io valkey
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.
AI Analysis
Technical Summary
CVE-2026-27623 is an improper input validation vulnerability (CWE-20) in the Valkey distributed key-value database affecting versions 9.0.0 up to but not including 9.0.3. A remote attacker with network access can send a crafted request that triggers an assertion failure due to the server not resetting networking state after an empty request, causing the server to abort. The vulnerability results in a denial-of-service condition by crashing the server. The issue is resolved in version 9.0.3. The vendor advisory from Red Hat confirms the vulnerability and the fix.
Potential Impact
The vulnerability allows an unauthenticated remote attacker to cause a denial of service by crashing the Valkey server. There is no impact on confidentiality or integrity, but availability is severely affected as the server aborts unexpectedly upon receiving malicious input.
Mitigation Recommendations
Upgrade Valkey to version 9.0.3 or later, which contains the official fix for this vulnerability. Additionally, isolate Valkey deployments so that only trusted users have network access to the service to reduce the risk of exploitation.
CVE-2026-27623: CWE-20: Improper Input Validation in valkey-io valkey
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.
CVSS v3.1
Score 7.5high
Affected software
pkg:github/valkey-io/valkeyRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-27623 is an improper input validation vulnerability (CWE-20) in the Valkey distributed key-value database affecting versions 9.0.0 up to but not including 9.0.3. A remote attacker with network access can send a crafted request that triggers an assertion failure due to the server not resetting networking state after an empty request, causing the server to abort. The vulnerability results in a denial-of-service condition by crashing the server. The issue is resolved in version 9.0.3. The vendor advisory from Red Hat confirms the vulnerability and the fix.
Potential Impact
The vulnerability allows an unauthenticated remote attacker to cause a denial of service by crashing the Valkey server. There is no impact on confidentiality or integrity, but availability is severely affected as the server aborts unexpectedly upon receiving malicious input.
Mitigation Recommendations
Upgrade Valkey to version 9.0.3 or later, which contains the official fix for this vulnerability. Additionally, isolate Valkey deployments so that only trusted users have network access to the service to reduce the risk of exploitation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-02-20T22:02:30.027Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-27623","vendor":"Red Hat"}]
Threat ID: 699cbd8cbe58cf853bc4b3f7
Added to database: 02/23/2026, 20:50:20 UTC
Last enriched: 07/15/2026, 08:44:12 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 121
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