Critical
Security advisory
HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-20444
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 10:39 UTC · Revision 1
Source evidence
HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."
osv:CVE-2019-20444
Complete source record
{
"id": "09b93543113adaa432920e994da1b4be800552d09c882ef53366b5a2888cde2c",
"url": "https://osv.dev/vulnerability/CVE-2019-20444",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-20444",
"summary": "HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an \"invalid fold.\"",
"evidence": "osv:CVE-2019-20444",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2019-20444",
"aliases": [
"CVE-2019-20444",
"GHSA-cqqj-4p63-rrmm"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/netty/netty",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5ddf45a2d51bf88e94ef5a60e0abdc492b008ce7"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "4.1.44"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"netty-4.1.43.Final",
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"netty-4.0.15.Final",
"netty-4.0.14.Final",
"netty-4.0.14.Beta1",
"netty-4.0.13.Final",
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"netty-4.0.11.Final",
"netty-4.0.10.Final",
"netty-4.0.8.Final",
"netty-4.0.7.Final",
"netty-4.0.6.Final",
"netty-4.0.5.Final",
"netty-4.0.4.Final",
"netty-4.0.3.Final",
"netty-4.0.2.Final",
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"netty-4.0.0.Beta3",
"netty-4.0.0.Beta2",
"netty-4.0.0.Beta1",
"netty-4.0.0.Alpha8",
"netty-4.0.0.Alpha7",
"netty-4.0.0.Alpha6",
"netty-4.0.0.Alpha5",
"netty-4.0.0.Alpha4",
"netty-4.0.0.Alpha3",
"netty-4.0.0.Alpha2",
"netty-4.0.0.Alpha1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-20444.json"
}
}
],
"modified": "2026-10-20T10:50:53.227319946Z",
"provider": "osv",
"references": [
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"https://lists.apache.org/thread.html/rf2bf8e2eb0a03227f5bc100b544113f8cafea01e887bb068e8d1fa41%40%3Ccommon-issues.hadoop.apache.org%3E",
"https://lists.apache.org/thread.html/rf2bf8e2eb0a03227f5bc100b544113f8cafea01e887bb068e8d1fa41@%3Ccommon-issues.hadoop.apache.org%3E",
"https://lists.apache.org/thread.html/rf5b2dfb7401666a19915f8eaef3ba9f5c3386e2066fcd2ae66e16a2f%40%3Cdev.flink.apache.org%3E",
"https://lists.apache.org/thread.html/rf5b2dfb7401666a19915f8eaef3ba9f5c3386e2066fcd2ae66e16a2f@%3Cdev.flink.apache.org%3E",
"https://lists.apache.org/thread.html/rfb55f245b08d8a6ec0fb4dc159022227cd22de34c4419c2fbb18802b%40%3Cnotifications.zookeeper.apache.org%3E",
"https://lists.apache.org/thread.html/rfb55f245b08d8a6ec0fb4dc159022227cd22de34c4419c2fbb18802b@%3Cnotifications.zookeeper.apache.org%3E",
"https://lists.apache.org/thread.html/rff210a24f3a924829790e69eaefa84820902b7b31f17c3bf2def9114%40%3Ccommits.druid.apache.org%3E",
"https://lists.apache.org/thread.html/rff210a24f3a924829790e69eaefa84820902b7b31f17c3bf2def9114@%3Ccommits.druid.apache.org%3E",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TS6VX7OMXPDJIU5LRGUAHRK6MENAVJ46/",
"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TS6VX7OMXPDJIU5LRGUAHRK6MENAVJ46/",
"https://access.redhat.com/errata/RHSA-2020:0497",
"https://access.redhat.com/errata/RHSA-2020:0567",
"https://access.redhat.com/errata/RHSA-2020:0601",
"https://access.redhat.com/errata/RHSA-2020:0605",
"https://access.redhat.com/errata/RHSA-2020:0606",
"https://access.redhat.com/errata/RHSA-2020:0804",
"https://access.redhat.com/errata/RHSA-2020:0805",
"https://access.redhat.com/errata/RHSA-2020:0806",
"https://access.redhat.com/errata/RHSA-2020:0811",
"https://lists.debian.org/debian-lts-announce/2020/02/msg00017.html",
"https://lists.debian.org/debian-lts-announce/2020/02/msg00018.html",
"https://lists.debian.org/debian-lts-announce/2020/09/msg00003.html",
"https://lists.debian.org/debian-lts-announce/2020/09/msg00004.html",
"https://usn.ubuntu.com/4532-1/",
"https://www.debian.org/security/2021/dsa-4885",
"https://github.com/netty/netty/compare/netty-4.1.43.Final...netty-4.1.44.Final",
"https://github.com/netty/netty/issues/9866"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
},
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "33"
},
{
"last_affected": "33"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:jboss_amq_clients:2:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:jboss_amq_clients",
"extracted_events": [
{
"range": [
{
"introduced": "2"
},
{
"last_affected": "2"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.2:*:*:*:*:*:*:*",
"cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.3:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:jboss_enterprise_application_platform",
"extracted_events": [
{
"range": [
{
"introduced": "7.2"
},
{
"last_affected": "7.2"
},
{
"introduced": "7.3"
},
{
"last_affected": "7.3"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2019-20444",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 382316,
"published_at": "2020-01-29T21:15:11.047+00:00"
}