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This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary, they can be exploited for request smuggling, header injection, or response splitting. 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{"bugzilla": {"description": "io.netty/netty-codec-http2: Netty: HTTP/2 header field values are not validated by default (CR/LF/NUL passthrough)", "id": "2536970", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2536970"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-1035", "details": ["A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary, they can be exploited for request smuggling, header injection, or response splitting. This could lead to unauthorized access, data manipulation, or other security bypasses."], "mitigation": {"lang": "en:us", "value": "See https://github.com/netty/netty/security/advisories/GHSA-8whp-c7w8-2m72 for fixed versions and remediation guidance."}, "name": "CVE-2026-93579", "package_state": [{"cpe": "cpe:/a:redhat:amq_broker:7", "fix_state": "Fix deferred", "package_name": "netty-codec-http2", "product_name": "Red Hat AMQ Broker 7"}, {"cpe": "cpe:/a:redhat:camel_quarkus:3", "fix_state": "Fix deferred", "package_name": "netty-codec-http2", "product_name": "Red Hat build of Apache Camel 4 for Quarkus 3"}, {"cpe": "cpe:/a:redhat:camel_spring_boot:4", "fix_state": "Fix deferred", "package_name": "netty-codec-http2", "product_name": "Red Hat build of Apache Camel for Spring Boot 4"}, {"cpe": "cpe:/a:redhat:apicurio_registry:3", "fix_state": "Fix deferred", "package_name": "netty-codec-http2", "product_name": "Red Hat build of Apicurio Registry 3"}, {"cpe": "cpe:/a:redhat:debezium:3", "fix_state": "Fix deferred", "package_name": "netty-codec-http2", "product_name": "Red Hat build of Debezium 3"}, {"cpe": "cpe:/a:redhat:build_keycloak:", "fix_state": "Out of support scope", "package_name": "netty-codec-http2", "product_name": "Red Hat Build of Keycloak"}, {"cpe": "cpe:/a:redhat:quarkus:3", "fix_state": "Fix deferred", "package_name": "netty-codec-http2", "product_name": "Red Hat build of Quarkus"}, {"cpe": "cpe:/a:redhat:jboss_data_grid:8", "fix_state": "Out of support scope", "package_name": "netty-codec-http2", "product_name": "Red Hat Data Grid 8"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Out of support scope", "package_name": "netty-codec-http2", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:7", "fix_state": "Out of support scope", "package_name": "netty-codec-http2", "product_name": "Red Hat JBoss Enterprise Application Platform 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Fix deferred", "package_name": "netty-codec-http2", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Out of support scope", "package_name": "netty-codec-http2", "product_name": "Red Hat Single Sign-On 7"}], "public_date": "2026-09-10T00:55:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93579\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93579"], "statement": "This Moderate flaw in Netty's HTTP/2 implementation arises from disabled-by-default header value validation. When Netty-based applications act as HTTP/2 to HTTP/1.1 translation proxies or gateways, this can enable request smuggling or response splitting attacks by allowing prohibited control characters to be injected into HTTP/1.1 headers. Pure end-to-end HTTP/2 deployments are not affected.", "threat_severity": "Moderate"}