CVE-2026-59898 - Vulnerability Details - OpenCVE

A flaw was found in netty-codec-http. The WebSocket handshaker in this component fails to properly validate protocol version information during the WebSocket upgrade process. A remote attacker can exploit this vulnerability by manipulating the WebSocket handshake, leading to a bypass of security checks or the negotiation of unexpected protocol versions. This could potentially enable protocol-level attacks.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

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References

Link	Providers
https://github.com/netty/netty/security/advisories/GHSA-4mp9-239f-g9hg
https://nvd.nist.gov/vuln/detail/CVE-2026-59898
https://www.cve.org/CVERecord?id=CVE-2026-59898

History

Tue, 28 Jul 2026 00:15:00 +0000

Type	Values Removed	Values Added
Description		A flaw was found in netty-codec-http. The WebSocket handshaker in this component fails to properly validate protocol version information during the WebSocket upgrade process. A remote attacker can exploit this vulnerability by manipulating the WebSocket handshake, leading to a bypass of security checks or the negotiation of unexpected protocol versions. This could potentially enable protocol-level attacks.
Title		io.netty/netty-codec-http: Netty: Protocol version confusion in netty-codec-http (WebSocket)
Weaknesses		CWE-358
References		https://github.com/netty/netty/security/advisories/GHSA-4mp9-239f-g9hg https://nvd.nist.gov/vuln/detail/CVE-2026-59898 https://www.cve.org/CVERecord?id=CVE-2026-59898
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}` threat_severity `Moderate`

MITRE

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Vulnrichment

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NVD

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Redhat

Severity : Moderate

Publid Date: 2026-07-09T00:00:00Z

Links: CVE-2026-59898 - Bugzilla

OpenCVE Enrichment

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{"bugzilla": {"description": "io.netty/netty-codec-http: Netty: Protocol version confusion in netty-codec-http (WebSocket)", "id": "2507479", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507479"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-358", "details": ["A flaw was found in netty-codec-http. The WebSocket handshaker in this component fails to properly validate protocol version information during the WebSocket upgrade process. A remote attacker can exploit this vulnerability by manipulating the WebSocket handshake, leading to a bypass of security checks or the negotiation of unexpected protocol versions. This could potentially enable protocol-level attacks."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-59898", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "netty-codec-http", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "openshift-serverless-1/kn-ekb-dispatcher-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "openshift-serverless-1/kn-ekb-receiver-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", 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"moderate", "package_name": "netty-codec-http", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Out of support scope", "impact": "moderate", "package_name": "netty-codec-http", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "netty-codec-http", "product_name": "streams for Apache Kafka 3"}], "public_date": "2026-07-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-59898\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-59898\nhttps://github.com/netty/netty/security/advisories/GHSA-4mp9-239f-g9hg"], "statement": "This Moderate flaw in Netty's WebSocket handshaker, specifically within `netty-codec-http`, could allow an attacker to bypass security checks or force unexpected protocol versions during the WebSocket upgrade process. This issue primarily impacts Red Hat products that leverage Netty for WebSocket communication, potentially leading to protocol-level attacks under certain deployment configurations.", "threat_severity": "Moderate"}