CVE-2026-27623

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{"bugzilla": {"description": "Valkey: Valkey: Denial of Service via specially crafted network requests", "id": "2442021", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442021"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["A flaw was found in Valkey. A malicious actor with network access to Valkey can cause the system to shut down by sending a specially crafted request. This occurs because the system does not properly reset its networking state after processing an empty request, leading to an assertion failure. This vulnerability results in a Denial of Service (DoS), making the Valkey database unavailable."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, restrict network access to Valkey deployments. Configure network firewalls or access control lists to ensure that only trusted users and systems can establish connections to the Valkey service. This will limit the exposure to malicious actors and prevent unauthorized denial of service attacks. Reloading network configurations or restarting firewall services may be required for changes to take effect."}, "name": "CVE-2026-27623", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "valkey", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "valkey", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-23T19:43:45Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-27623\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27623\nhttps://github.com/valkey-io/valkey/security/advisories/GHSA-93p9-5vc7-8wgr"], "statement": "This is an IMPORTANT denial-of-service vulnerability in Valkey versions 9.0.0 through 9.0.2. A remote, unauthenticated attacker with network access to a Valkey instance can send a malformed request, causing the server to terminate due to an assertion failure. This issue arises from improper state handling after processing an empty request.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.0,9.0.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "valkey", "source": "cna", "vendor": "valkey-io"}, "product": "valkey", "vendor": "valkey-io"}], "analysis": {"en": {"generated_at": "2026-04-17T16:15:35.109581+00:00", "value": {"mitigation_remediation": ["Upgrade Valkey to version 9.0.3 or later, which addresses the assertion trigger caused by malformed RESP requests.", "Restrict network access to the Valkey server so that only trusted hosts can reach it, using firewalls or network segmentation.", "If an upgrade cannot be performed immediately, monitor the server for unexpected restarts and consider temporarily disabling any exposed interfaces that handle RESP requests until a patch is applied."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Valkey, distributed key\u2011value database by valkey-io, is affected in versions 9.0.0 through 9.0.2, inclusive. The fix was applied in version 9.0.3.", "description_and_impact": "A malicious actor with network access to Valkey can trigger an assertion that causes the server to abort by sending a malformed RESP request before authentication. The server fails to reset its networking state after an empty request, leading to a condition where a specially crafted request is interpreted as violating server invariants and results in a shutdown. The primary impact is denial of service, preventing legitimate clients from accessing the database.", "risk_and_exploitability": "The CVSS score of 7.5 indicates a high\u2011severity vulnerability. The EPSS score of less than 1% suggests a low probability of exploitation, and the vulnerability is not listed in the CISA KEV catalog. An attacker only needs network connectivity to the Valkey instance; credentials are not required. By sending a malformed RESP request before establishing authentication, a remote adversary can repeatedly trigger the server to shut down, disrupting availability of the service."}}}}, "created": "2026-02-24T09:55:26.744938+00:00", "updated": "2026-04-17T16:30:05.818778+00:00", "vendors": ["valkey-io", "valkey-io$PRODUCT$valkey"]}