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{"bugzilla": {"description": "netty-codec-http2: Netty: Denial of Service via uncontrolled HTTP/2 concurrent streams", "id": "2488399", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2488399"}, "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:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-770", "details": ["Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, DefaultHttp2Connection.DefaultEndpoint initialises maxActiveStreams/maxStreams to Integer.MAX_VALUE, and Http2Settings never inserts SETTINGS_MAX_CONCURRENT_STREAMS by default (Http2Settings.java:305-307 only clamps a user-supplied value). Unless the application explicitly calls initialSettings().maxConcurrentStreams(n), a Netty HTTP/2 server advertises no limit and enforces none locally. 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This excessive resource consumption can result in a denial of service (DoS), making the server unavailable to legitimate users."], "mitigation": {"lang": "en:us", "value": "Configure affected applications using Netty HTTP/2 servers to explicitly set a maximum concurrent streams limit. Consult product-specific documentation for instructions on how to apply this configuration. Additionally, restrict network access to affected services to trusted clients and networks by implementing firewall rules or other network access controls. 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"2026-06-12T14:23:50Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-47244\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-47244\nhttps://github.com/netty/netty/releases/tag/netty-4.1.135.Final\nhttps://github.com/netty/netty/releases/tag/netty-4.2.15.Final\nhttps://github.com/netty/netty/security/advisories/GHSA-5x3r-wrvg-rp6q"], "statement": "This Moderate impact flaw in Netty's HTTP/2 implementation can lead to a denial of service in Red Hat products that utilize Netty as an HTTP/2 server without explicitly configured limits on concurrent streams. An attacker can exhaust server resources by initiating numerous HTTP/2 stream requests, rendering the service unavailable. The impact is limited to denial of service and requires a specific server configuration to be exploitable.", "threat_severity": "Moderate"}

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