{"id":"CVE-2026-93566","aliases":["DEBIAN-CVE-2026-93566","EUVD-2026-82935","GHSA-9mrj-55p4-qwf4","SUSE-SU-2026:4391-1","UBUNTU-CVE-2026-93566","openSUSE-SU-2026:11882-1"],"status":"published","title":"Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the chunk-size line","description":"A flaw was found in Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00578,"percentile":0.48081,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1035"],"published":"2026-09-18T14:19:29Z","modified":"2026-11-06T17:27:28Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"netty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.1.48-10","1:4.1.48-11","1:4.1.48-12","1:4.1.48-13","1:4.1.48-14","1:4.1.48-15","1:4.1.48-16","1:4.1.48-7","1:4.1.48-7+deb12u1","1:4.1.48-7+deb12u2","1:4.1.48-8","1:4.1.48-9"]},{"source":"osv","ecosystem":"Debian:13","package":"netty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.1.48-10","1:4.1.48-10+deb13u1","1:4.1.48-11","1:4.1.48-12","1:4.1.48-13","1:4.1.48-14","1:4.1.48-15","1:4.1.48-16"]},{"source":"osv","ecosystem":"Debian:14","package":"netty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:4.1.48-10","1:4.1.48-11","1:4.1.48-12","1:4.1.48-13","1:4.1.48-14","1:4.1.48-15","1:4.1.48-16"]},{"source":"osv","ecosystem":"SUSE:Linux 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7"}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:69440","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:69470","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:83612","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95759","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95760","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95761","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95762","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:95887","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-93566","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536954","tags":["issue-tracking","x_refsource_REDHAT","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93566"},{"url":"https://github.com/advisories/GHSA-9mrj-55p4-qwf4"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-93566","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20264391-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1275500","tags":["report"]},{"url":"https://bugzilla.suse.com/1275501","tags":["report"]},{"url":"https://bugzilla.suse.com/1276420","tags":["report"]},{"url":"https://bugzilla.suse.com/1276421","tags":["report"]},{"url":"https://bugzilla.suse.com/1276455","tags":["report"]},{"url":"https://bugzilla.suse.com/1276456","tags":["report"]},{"url":"https://bugzilla.suse.com/1277243","tags":["report"]},{"url":"https://bugzilla.suse.com/1280048","tags":["report"]},{"url":"https://bugzilla.suse.com/1281431","tags":["report"]},{"url":"https://bugzilla.suse.com/1281432","tags":["report"]},{"url":"https://bugzilla.suse.com/1281433","tags":["report"]},{"url":"https://bugzilla.suse.com/1281434","tags":["report"]},{"url":"https://bugzilla.suse.com/1281435","tags":["report"]},{"url":"https://bugzilla.suse.com/1282084","tags":["report"]},{"url":"https://bugzilla.suse.com/1282085","tags":["report"]},{"url":"https://bugzilla.suse.com/1282132","tags":["report"]},{"url":"https://bugzilla.suse.com/1282140","tags":["report"]},{"url":"https://bugzilla.suse.com/1282141","tags":["report"]},{"url":"https://bugzilla.suse.com/1282362","tags":["report"]},{"url":"https://bugzilla.suse.com/1282363","tags":["report"]},{"url":"https://bugzilla.suse.com/1282364","tags":["report"]},{"url":"https://bugzilla.suse.com/1282366","tags":["report"]},{"url":"https://bugzilla.suse.com/1282367","tags":["report"]},{"url":"https://bugzilla.suse.com/1282370","tags":["report"]},{"url":"https://bugzilla.suse.com/1282372","tags":["report"]},{"url":"https://bugzilla.suse.com/1282373","tags":["report"]},{"url":"https://bugzilla.suse.com/1282374","tags":["report"]},{"url":"https://bugzilla.suse.com/1282378","tags":["report"]},{"url":"https://bugzilla.suse.com/1282506","tags":["report"]},{"url":"https://bugzilla.suse.com/1282507","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-59902","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-59903","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62243","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62380","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-75595","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-75596","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-76816","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-89044","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93488","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93491","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93492","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93493","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93494","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93558","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93560","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93562","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93563","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93564","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93565","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93566","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93567","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93568","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-93569","tags":["web"]},{"url":"https://www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netty: http request smuggling due to control characters in the chunk-size line","description":"A flaw was found in Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.","status":"published","published":"2026-09-18T14:19:29.741Z","modified":"2026-11-06T17:27:28.56Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-1035"],"updated_at":"2026-11-06T18:59:09.209977Z"}],"euvd":[{"id":"EUVD-2026-82935","description":"A flaw was found in Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.","status":"published","published":"2026-09-18T14:19:29Z","modified":"2026-11-06T17:27:28Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-06T18:05:39.47551Z"}],"ghsa":[{"id":"GHSA-9mrj-55p4-qwf4","title":"### Summary\nNetty skips strict chunk size line validation when the line has no chunk extension (`...","description":"### Summary\nNetty skips strict chunk size line validation when the line has no chunk extension (`;`), so a chunk size line containing an embedded bare CR (e.g. `0\\rX`) is accepted instead of rejected, enabling HTTP request smuggling.\n\n### Details\n`io.netty.handler.codec.http.HttpObjectDecoder#checkChunkExtensions` only runs the strict validator `HttpChunkLineValidatingByteProcessor` when a `;` is present:\n\n```java\n        int extensionsStart = line.bytesBefore((byte) ';');\n        if (extensionsStart == -1) {\n            return;\n        }\n```\n\nAccording to RFC 9112 https://datatracker.ietf.org/doc/html/rfc9112#appendix-A\n\n`chunk-size = 1*HEXDIG`\n\n### PoC\n\n```java\n@Test\npublic void test() {\n    String requestStr = \"POST / HTTP/1.1\\r\\n\" +\n            \"Host: localhost\\r\\n\" +\n            \"Transfer-Encoding: chunked\\r\\n\\r\\n\" +\n            \"0\\rX\\r\\n\" +\n            \"\\r\\n\" +\n            \"GET /smuggled HTTP/1.1\\r\\n\" +\n            \"Host: localhost\\r\\n\" +\n            \"Content-Length: 0\\r\\n\" +\n            \"\\r\\n\";\n\n    EmbeddedChannel channel = new EmbeddedChannel(new HttpRequestDecoder());\n    assertTrue(channel.writeInbound(Unpooled.copiedBuffer(requestStr, Ch","status":"published","published":"2026-09-18T15:32:20Z","modified":"2026-11-06T18:34:52Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-06T19:01:25.944997Z"}],"nvd":[{"id":"CVE-2026-93566","description":"A flaw was found in Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.","status":"published","published":"2026-09-18T15:17:20.29Z","modified":"2026-11-06T18:18:25.757Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-1035"],"updated_at":"2026-11-06T20:01:13.550593Z"}],"osv":[{"id":"DEBIAN-CVE-2026-93566","description":"A flaw was found in Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.","status":"published","published":"2026-09-18T15:17:20.29Z","modified":"2026-11-07T09:47:28.736988069Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-07T10:14:39.995311Z"},{"id":"UBUNTU-CVE-2026-93566","description":"A flaw was found in Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.","status":"published","published":"2026-09-18T15:17:00Z","modified":"2026-10-17T13:01:18.287714916Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:57:44.071534Z"},{"id":"openSUSE-SU-2026:11882-1","title":"netty-4.1.138-1.1 on GA media","description":"These are all security issues fixed in the netty-4.1.138-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-24T00:00:00Z","modified":"2026-09-25T18:23:09.573141425Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"SUSE-SU-2026:4391-1","title":"Security update for netty, netty-tcnative","description":"This update for netty, netty-tcnative fixes the following issues:\n\n- CVE-2026-59902: Netty: Memory Exhaustion in SctpMessageCompletionHandler (bsc#1275501).\n- CVE-2026-59903: Netty Vulnerable to Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite\n  (bsc#1275500).\n- CVE-2026-62243: TLS hostname verification bypass in Netty OpenSSL client path (bsc#1276455).\n- CVE-2026-62380: null byte and CRLF injection in Socks4ClientEncoder and Socks5ClientEncoder (bsc#1276456).\n- CVE-2026-75595: fragmented TLS `ClientHello` causes fallback to default `SslContext` and allows for SNI routing and\n  mTLS requirement bypass (bsc#1276420).\n- CVE-2026-75596: fragmented `ClientHello`records can trigger quadratic pre-handshake reassembly in default SNI parsing\n  (bsc#1276421).\n- CVE-2026-76816: missing input validation in `MqttEncoder` allows for null-byte injection, topic hijacking, and ACL\n  bypassing (bsc#1277243).\n- CVE-2026-89044: HTTP request smuggling in Netty via improper validation of final Transfer-Encoding coding\n  (bsc#1280048).\n- CVE-2026-93488: Denial of Service via unbounded concurrent SPDY streams (bsc#1282084).\n- CVE-2026-93491: Denial of Service via unbounded HttpServerCodec HTTP/1.1 pipeline queue (bsc#1282085).\n- CVE-2026-93492: HTTP/2 HpackEncoder DoS with large table size (bsc#1282132).\n- CVE-2026-93493: missing `nextUpdate` field in OCSP responses leads to silent validation bypass (bsc#1281431).\n- CVE-2026-93494: ByteBuf Leak in StompSubframeDecoder When a Frame Body Is Never Terminated (bsc#1282506).\n- CVE-2026-93558: Unbounded Per-Connection Queue Growth in WebSocketServerExtensionHandler Leads to Denial of Service\n  (bsc#1282140).\n- CVE-2026-93560: STOMP codec content-length long-to-int truncation causes infinite decode loop DoS (bsc#1282141).\n- CVE-2026-93562: Incomplete validation of malformed Transfer-Encoding allows HTTP request smuggling (bsc#1282362).\n- CVE-2026-93563: unbounded multi-line response accumulation in `SmtpResponseDecoder` leads to memory exhaustion and a\n  DoS (bsc#1281432).\n- CVE-2026-93564: HAProxy PROXY-v2 nested-TLV grandchild ByteBuf reference-count leak (bsc#1282363).\n- CVE-2026-93565: RtspDecoder Method-Token Smuggling via Trailing Control Byte (bsc#1282364).\n- CVE-2026-93566: HTTP Request Smuggling due to control characters in the chunk-size line (bsc#1282366).\n- CVE-2026-93567: HTTP/1 authority-form CONNECT is translated to malformed HTTP/2 CONNECT with Host-controlled\n  :authority (bsc#1282367).\n- CVE-2026-93568: HTTP/2 and HTTP/3 Extended CONNECT requests are downgraded as regular CONNECT requests (bsc#1282370).\n- CVE-2026-93569: HTTP/1 absolute-form Host mismatch is translated to HTTP/2 :authority, overriding the request-target\n  authority (bsc#1282372).\n- CVE-2026-93572: multiplication of patched preallocation limits in `RedisArrayAggregator` nested RESP headers can lead\n  to denial of service (bsc#1281433).\n- CVE-2026-93573: Incomplete validation of malformed Transfer-Encoding allows HTTP request smuggling (bsc#1282373).\n- CVE-2026-93574: HTTP request smuggling via post-digit whitespace in chunk-size parsing (bsc#1282374).\n- CVE-2026-93575: missing validations in the `MqttDecoder` can lead to excessive resource consumption and a DoS\n  (bsc#1281434).\n- CVE-2026-93576: netty-codec-smtp -- SMTP command-name field is not CRLF-validated (bsc#1282507).\n- CVE-2026-93578: missing Extended Key Usage (EKU) check in OCSP client allows certificate revocation bypass\n  (bsc#1281435).\n- CVE-2026-93579: HTTP/2 header field values are not validated by default (bsc#1282378).\n\nChanges for netty:\n\n- Upgrade to upstream version 4.1.138\n\nChanges for netty-tcnative:\n\n- Upgrade to version 2.0.84 Final\n","status":"published","published":"2026-09-29T11:47:41Z","modified":"2026-09-30T12:00:04.604890726Z","updated_at":"2026-11-02T15:54:05.838224Z"}]}}