ubuntu-cve-2026-1642
Vulnerability from osv_ubuntu
Published
2026-02-04 15:16
Modified
2026-06-03 15:48
Summary
Details
A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side—along with conditions beyond the attacker's control—may be able to inject plain text data into the response from an upstream proxied server. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Severity
5.9 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "nginx",
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},
{
"binary_name": "nginx-common",
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},
{
"binary_name": "nginx-core",
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},
{
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},
{
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},
{
"binary_name": "nginx-light",
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},
{
"binary_name": "nginx-naxsi",
"binary_version": "1.4.6-1ubuntu3.9+esm6"
},
{
"binary_name": "nginx-naxsi-ui",
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}
]
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},
"ranges": [
{
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},
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"1.4.5-1ubuntu1",
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"1.4.6-1ubuntu3",
"1.4.6-1ubuntu3.1",
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"1.4.6-1ubuntu3.4",
"1.4.6-1ubuntu3.5",
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"1.4.6-1ubuntu3.8",
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"1.4.6-1ubuntu3.9+esm2",
"1.4.6-1ubuntu3.9+esm3",
"1.4.6-1ubuntu3.9+esm4",
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},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
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{
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},
{
"binary_name": "nginx-common",
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},
{
"binary_name": "nginx-core",
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{
"binary_name": "nginx-extras",
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{
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{
"binary_name": "nginx-light",
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},
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},
"ranges": [
{
"events": [
{
"introduced": "0"
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{
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],
"versions": [
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"1.9.6-2ubuntu1",
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"1.9.9-1ubuntu1",
"1.9.10-0ubuntu1",
"1.9.10-1ubuntu1",
"1.9.11-0ubuntu1",
"1.9.11-0ubuntu2",
"1.9.12-0ubuntu1",
"1.9.13-0ubuntu1",
"1.9.14-0ubuntu1",
"1.9.15-0ubuntu1",
"1.10.0-0ubuntu0.16.04.1",
"1.10.0-0ubuntu0.16.04.2",
"1.10.0-0ubuntu0.16.04.3",
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{
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"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
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{
"binary_name": "libnginx-mod-http-auth-pam",
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"binary_name": "libnginx-mod-http-cache-purge",
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{
"binary_name": "libnginx-mod-http-dav-ext",
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{
"binary_name": "libnginx-mod-http-echo",
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},
{
"binary_name": "libnginx-mod-http-fancyindex",
"binary_version": "1.14.0-0ubuntu1.11+esm2"
},
{
"binary_name": "libnginx-mod-http-geoip",
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{
"binary_name": "libnginx-mod-http-headers-more-filter",
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{
"binary_name": "libnginx-mod-http-image-filter",
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{
"binary_name": "libnginx-mod-http-lua",
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},
{
"binary_name": "libnginx-mod-http-ndk",
"binary_version": "1.14.0-0ubuntu1.11+esm2"
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{
"binary_name": "libnginx-mod-http-perl",
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},
{
"binary_name": "libnginx-mod-http-subs-filter",
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{
"binary_name": "libnginx-mod-http-uploadprogress",
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},
{
"binary_name": "libnginx-mod-http-upstream-fair",
"binary_version": "1.14.0-0ubuntu1.11+esm2"
},
{
"binary_name": "libnginx-mod-http-xslt-filter",
"binary_version": "1.14.0-0ubuntu1.11+esm2"
},
{
"binary_name": "libnginx-mod-mail",
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},
{
"binary_name": "libnginx-mod-nchan",
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{
"binary_name": "libnginx-mod-rtmp",
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{
"binary_name": "libnginx-mod-stream",
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},
{
"binary_name": "nginx",
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{
"binary_name": "nginx-common",
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{
"binary_name": "nginx-core",
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"binary_name": "nginx-extras",
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{
"binary_name": "nginx-full",
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{
"binary_name": "nginx-light",
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]
},
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"name": "nginx",
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},
"ranges": [
{
"events": [
{
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},
{
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},
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{
"binary_name": "libnginx-mod-http-dav-ext",
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{
"binary_name": "libnginx-mod-http-echo",
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{
"binary_name": "libnginx-mod-http-fancyindex",
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{
"binary_name": "libnginx-mod-http-geoip",
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{
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{
"binary_name": "libnginx-mod-http-headers-more-filter",
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{
"binary_name": "libnginx-mod-http-image-filter",
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{
"binary_name": "libnginx-mod-http-lua",
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{
"binary_name": "libnginx-mod-http-ndk",
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{
"binary_name": "libnginx-mod-http-perl",
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{
"binary_name": "libnginx-mod-http-subs-filter",
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{
"binary_name": "libnginx-mod-http-uploadprogress",
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{
"binary_name": "libnginx-mod-http-upstream-fair",
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{
"binary_name": "libnginx-mod-http-xslt-filter",
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{
"binary_name": "libnginx-mod-mail",
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{
"binary_name": "libnginx-mod-nchan",
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{
"binary_name": "libnginx-mod-rtmp",
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{
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{
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{
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{
"binary_name": "nginx-extras",
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{
"binary_name": "nginx-full",
"binary_version": "1.18.0-0ubuntu1.7+esm1"
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{
"binary_name": "nginx-light",
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]
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"package": {
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},
{
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{
"binary_name": "libnginx-mod-http-cache-purge",
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"binary_name": "libnginx-mod-http-dav-ext",
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"binary_name": "libnginx-mod-http-echo",
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"binary_name": "libnginx-mod-http-fancyindex",
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{
"binary_name": "libnginx-mod-http-geoip",
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{
"binary_name": "libnginx-mod-http-geoip2",
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{
"binary_name": "libnginx-mod-http-headers-more-filter",
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"binary_name": "libnginx-mod-http-image-filter",
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{
"binary_name": "libnginx-mod-http-ndk",
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},
{
"binary_name": "libnginx-mod-http-perl",
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},
{
"binary_name": "libnginx-mod-http-subs-filter",
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{
"binary_name": "libnginx-mod-http-uploadprogress",
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{
"binary_name": "libnginx-mod-http-upstream-fair",
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},
{
"binary_name": "libnginx-mod-http-xslt-filter",
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{
"binary_name": "libnginx-mod-mail",
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{
"binary_name": "libnginx-mod-nchan",
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{
"binary_name": "libnginx-mod-rtmp",
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{
"binary_name": "libnginx-mod-stream",
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{
"binary_name": "libnginx-mod-stream-geoip",
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{
"binary_name": "libnginx-mod-stream-geoip2",
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{
"binary_name": "nginx",
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},
{
"binary_name": "nginx-common",
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{
"binary_name": "nginx-core",
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{
"binary_name": "nginx-extras",
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{
"binary_name": "nginx-full",
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{
"binary_name": "nginx-light",
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"binary_name": "libnginx-mod-http-image-filter",
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{
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{
"binary_name": "nginx",
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"binary_name": "nginx-common",
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"binary_name": "nginx-core",
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"binary_name": "nginx-extras",
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"package": {
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{
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{
"binary_name": "libnginx-mod-stream",
"binary_version": "1.28.0-6ubuntu1.1"
},
{
"binary_name": "libnginx-mod-stream-geoip",
"binary_version": "1.28.0-6ubuntu1.1"
},
{
"binary_name": "nginx",
"binary_version": "1.28.0-6ubuntu1.1"
},
{
"binary_name": "nginx-common",
"binary_version": "1.28.0-6ubuntu1.1"
},
{
"binary_name": "nginx-core",
"binary_version": "1.28.0-6ubuntu1.1"
},
{
"binary_name": "nginx-extras",
"binary_version": "1.28.0-6ubuntu1.1"
},
{
"binary_name": "nginx-full",
"binary_version": "1.28.0-6ubuntu1.1"
},
{
"binary_name": "nginx-light",
"binary_version": "1.28.0-6ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.28.0-6ubuntu1.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.28.0-6ubuntu1.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.26.3-2ubuntu1",
"1.26.3-3ubuntu1",
"1.26.3-3ubuntu2",
"1.26.3-3ubuntu3",
"1.28.0-3ubuntu1",
"1.28.0-4ubuntu1",
"1.28.0-6ubuntu1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnginx-mod-http-geoip",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "libnginx-mod-http-image-filter",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "libnginx-mod-http-perl",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "libnginx-mod-http-xslt-filter",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "libnginx-mod-mail",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "libnginx-mod-stream",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "libnginx-mod-stream-geoip",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "nginx",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "nginx-common",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "nginx-core",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "nginx-extras",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "nginx-full",
"binary_version": "1.28.1-3ubuntu1"
},
{
"binary_name": "nginx-light",
"binary_version": "1.28.1-3ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.28.1-3ubuntu1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.28.1-3ubuntu1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.28.0-6ubuntu1",
"1.28.1-2ubuntu1"
]
}
],
"aliases": [],
"details": "A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side\u2014along with conditions beyond the attacker\u0027s control\u2014may be able to inject plain text data into the response from an upstream proxied server.\u00a0\u00a0Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
"id": "UBUNTU-CVE-2026-1642",
"modified": "2026-06-03T15:48:17Z",
"published": "2026-02-04T15:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-1642"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-1642"
},
{
"type": "REPORT",
"url": "https://www.openwall.com/lists/oss-security/2026/02/05/1"
},
{
"type": "REPORT",
"url": "https://my.f5.com/manage/s/article/K000159824"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8038-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8375-1"
}
],
"related": [
"USN-8038-1",
"USN-8375-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-1642"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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