ubuntu-cve-2026-49975
Vulnerability from osv_ubuntu
Published
2026-06-03 00:00
Modified
2026-07-21 10:43
Summary
Details
Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.
Severity
7.5 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "apache2",
"binary_version": "2.4.18-2ubuntu3.17+esm19"
},
{
"binary_name": "apache2-bin",
"binary_version": "2.4.18-2ubuntu3.17+esm19"
},
{
"binary_name": "apache2-data",
"binary_version": "2.4.18-2ubuntu3.17+esm19"
},
{
"binary_name": "apache2-suexec-custom",
"binary_version": "2.4.18-2ubuntu3.17+esm19"
},
{
"binary_name": "apache2-suexec-pristine",
"binary_version": "2.4.18-2ubuntu3.17+esm19"
},
{
"binary_name": "apache2-utils",
"binary_version": "2.4.18-2ubuntu3.17+esm19"
}
]
},
"package": {
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"name": "apache2",
"purl": "pkg:deb/ubuntu/apache2@2.4.18-2ubuntu3.17+esm19?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.18-2ubuntu3.17+esm19"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.4.12-2ubuntu2",
"2.4.17-1ubuntu1",
"2.4.17-2ubuntu1",
"2.4.17-3ubuntu1",
"2.4.18-1ubuntu1",
"2.4.18-2ubuntu1",
"2.4.18-2ubuntu2",
"2.4.18-2ubuntu3",
"2.4.18-2ubuntu3.1",
"2.4.18-2ubuntu3.2",
"2.4.18-2ubuntu3.3",
"2.4.18-2ubuntu3.4",
"2.4.18-2ubuntu3.5",
"2.4.18-2ubuntu3.7",
"2.4.18-2ubuntu3.8",
"2.4.18-2ubuntu3.9",
"2.4.18-2ubuntu3.10",
"2.4.18-2ubuntu3.12",
"2.4.18-2ubuntu3.13",
"2.4.18-2ubuntu3.14",
"2.4.18-2ubuntu3.15",
"2.4.18-2ubuntu3.17",
"2.4.18-2ubuntu3.17+esm1",
"2.4.18-2ubuntu3.17+esm2",
"2.4.18-2ubuntu3.17+esm3",
"2.4.18-2ubuntu3.17+esm4",
"2.4.18-2ubuntu3.17+esm5",
"2.4.18-2ubuntu3.17+esm6",
"2.4.18-2ubuntu3.17+esm7",
"2.4.18-2ubuntu3.17+esm8",
"2.4.18-2ubuntu3.17+esm9",
"2.4.18-2ubuntu3.17+esm10",
"2.4.18-2ubuntu3.17+esm11",
"2.4.18-2ubuntu3.17+esm12",
"2.4.18-2ubuntu3.17+esm13",
"2.4.18-2ubuntu3.17+esm14",
"2.4.18-2ubuntu3.17+esm16",
"2.4.18-2ubuntu3.17+esm17",
"2.4.18-2ubuntu3.17+esm18"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "apache2",
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},
{
"binary_name": "apache2-bin",
"binary_version": "2.4.29-1ubuntu4.27+esm10"
},
{
"binary_name": "apache2-data",
"binary_version": "2.4.29-1ubuntu4.27+esm10"
},
{
"binary_name": "apache2-suexec-custom",
"binary_version": "2.4.29-1ubuntu4.27+esm10"
},
{
"binary_name": "apache2-suexec-pristine",
"binary_version": "2.4.29-1ubuntu4.27+esm10"
},
{
"binary_name": "apache2-utils",
"binary_version": "2.4.29-1ubuntu4.27+esm10"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "apache2",
"purl": "pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.27+esm10?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.29-1ubuntu4.27+esm10"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.4.27-2ubuntu3",
"2.4.29-1ubuntu1",
"2.4.29-1ubuntu2",
"2.4.29-1ubuntu3",
"2.4.29-1ubuntu4",
"2.4.29-1ubuntu4.1",
"2.4.29-1ubuntu4.2",
"2.4.29-1ubuntu4.3",
"2.4.29-1ubuntu4.4",
"2.4.29-1ubuntu4.5",
"2.4.29-1ubuntu4.6",
"2.4.29-1ubuntu4.7",
"2.4.29-1ubuntu4.8",
"2.4.29-1ubuntu4.10",
"2.4.29-1ubuntu4.11",
"2.4.29-1ubuntu4.12",
"2.4.29-1ubuntu4.13",
"2.4.29-1ubuntu4.14",
"2.4.29-1ubuntu4.16",
"2.4.29-1ubuntu4.17",
"2.4.29-1ubuntu4.18",
"2.4.29-1ubuntu4.19",
"2.4.29-1ubuntu4.20",
"2.4.29-1ubuntu4.21",
"2.4.29-1ubuntu4.22",
"2.4.29-1ubuntu4.23",
"2.4.29-1ubuntu4.24",
"2.4.29-1ubuntu4.25",
"2.4.29-1ubuntu4.26",
"2.4.29-1ubuntu4.27",
"2.4.29-1ubuntu4.27+esm1",
"2.4.29-1ubuntu4.27+esm2",
"2.4.29-1ubuntu4.27+esm3",
"2.4.29-1ubuntu4.27+esm4",
"2.4.29-1ubuntu4.27+esm6",
"2.4.29-1ubuntu4.27+esm7",
"2.4.29-1ubuntu4.27+esm8",
"2.4.29-1ubuntu4.27+esm9"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnginx-mod-http-auth-pam",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-cache-purge",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-dav-ext",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-echo",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-fancyindex",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-geoip",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-headers-more-filter",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-image-filter",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-lua",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-ndk",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-perl",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-subs-filter",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-uploadprogress",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-upstream-fair",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-http-xslt-filter",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-mail",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-nchan",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-rtmp",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "libnginx-mod-stream",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "nginx",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "nginx-common",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "nginx-core",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "nginx-extras",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "nginx-full",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
},
{
"binary_name": "nginx-light",
"binary_version": "1.14.0-0ubuntu1.11+esm4"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.14.0-0ubuntu1.11+esm4?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.12.1-0ubuntu2",
"1.13.6-2ubuntu1",
"1.13.6-2ubuntu2",
"1.13.10-1ubuntu1",
"1.13.12-0ubuntu1",
"1.14.0-0ubuntu1",
"1.14.0-0ubuntu1.1",
"1.14.0-0ubuntu1.2",
"1.14.0-0ubuntu1.3",
"1.14.0-0ubuntu1.4",
"1.14.0-0ubuntu1.5",
"1.14.0-0ubuntu1.6",
"1.14.0-0ubuntu1.7",
"1.14.0-0ubuntu1.9",
"1.14.0-0ubuntu1.10",
"1.14.0-0ubuntu1.11",
"1.14.0-0ubuntu1.11+esm1",
"1.14.0-0ubuntu1.11+esm2",
"1.14.0-0ubuntu1.11+esm4"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "apache2",
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},
{
"binary_name": "apache2-bin",
"binary_version": "2.4.41-4ubuntu3.23+esm5"
},
{
"binary_name": "apache2-data",
"binary_version": "2.4.41-4ubuntu3.23+esm5"
},
{
"binary_name": "apache2-suexec-custom",
"binary_version": "2.4.41-4ubuntu3.23+esm5"
},
{
"binary_name": "apache2-suexec-pristine",
"binary_version": "2.4.41-4ubuntu3.23+esm5"
},
{
"binary_name": "apache2-utils",
"binary_version": "2.4.41-4ubuntu3.23+esm5"
},
{
"binary_name": "libapache2-mod-md",
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},
{
"binary_name": "libapache2-mod-proxy-uwsgi",
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]
},
"package": {
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"name": "apache2",
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},
"ranges": [
{
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{
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{
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],
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"2.4.41-4ubuntu2",
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"2.4.41-4ubuntu3.1",
"2.4.41-4ubuntu3.3",
"2.4.41-4ubuntu3.4",
"2.4.41-4ubuntu3.5",
"2.4.41-4ubuntu3.6",
"2.4.41-4ubuntu3.7",
"2.4.41-4ubuntu3.8",
"2.4.41-4ubuntu3.9",
"2.4.41-4ubuntu3.10",
"2.4.41-4ubuntu3.11",
"2.4.41-4ubuntu3.12",
"2.4.41-4ubuntu3.13",
"2.4.41-4ubuntu3.14",
"2.4.41-4ubuntu3.15",
"2.4.41-4ubuntu3.16",
"2.4.41-4ubuntu3.17",
"2.4.41-4ubuntu3.19",
"2.4.41-4ubuntu3.20",
"2.4.41-4ubuntu3.21",
"2.4.41-4ubuntu3.23",
"2.4.41-4ubuntu3.23+esm2",
"2.4.41-4ubuntu3.23+esm3",
"2.4.41-4ubuntu3.23+esm4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnginx-mod-http-auth-pam",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-cache-purge",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-dav-ext",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-echo",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-fancyindex",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-geoip",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-geoip2",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-headers-more-filter",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-image-filter",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-lua",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-ndk",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-perl",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-subs-filter",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-uploadprogress",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-upstream-fair",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-http-xslt-filter",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-mail",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-nchan",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-rtmp",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "libnginx-mod-stream",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "nginx",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "nginx-common",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "nginx-core",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "nginx-extras",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "nginx-full",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
},
{
"binary_name": "nginx-light",
"binary_version": "1.18.0-0ubuntu1.7+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.18.0-0ubuntu1.7+esm3?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.16.1-0ubuntu2",
"1.16.1-0ubuntu3",
"1.17.5-0ubuntu1",
"1.17.6-0ubuntu1",
"1.17.7-0ubuntu1",
"1.17.8-0ubuntu1",
"1.17.8-0ubuntu2",
"1.17.8-0ubuntu3",
"1.17.9-0ubuntu1",
"1.17.9-0ubuntu2",
"1.17.9-0ubuntu3",
"1.17.10-0ubuntu1",
"1.18.0-0ubuntu1",
"1.18.0-0ubuntu1.2",
"1.18.0-0ubuntu1.3",
"1.18.0-0ubuntu1.4",
"1.18.0-0ubuntu1.5",
"1.18.0-0ubuntu1.6",
"1.18.0-0ubuntu1.7",
"1.18.0-0ubuntu1.7+esm1",
"1.18.0-0ubuntu1.7+esm3"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "apache2",
"binary_version": "2.4.52-1ubuntu4.21"
},
{
"binary_name": "apache2-bin",
"binary_version": "2.4.52-1ubuntu4.21"
},
{
"binary_name": "apache2-data",
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},
{
"binary_name": "apache2-suexec-custom",
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},
{
"binary_name": "apache2-suexec-pristine",
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},
{
"binary_name": "apache2-utils",
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},
{
"binary_name": "libapache2-mod-md",
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},
{
"binary_name": "libapache2-mod-proxy-uwsgi",
"binary_version": "2.4.52-1ubuntu4.21"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "apache2",
"purl": "pkg:deb/ubuntu/apache2@2.4.52-1ubuntu4.21?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
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},
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],
"type": "ECOSYSTEM"
}
],
"versions": [
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"2.4.48-3.1ubuntu4",
"2.4.51-2ubuntu1",
"2.4.52-1ubuntu1",
"2.4.52-1ubuntu2",
"2.4.52-1ubuntu4",
"2.4.52-1ubuntu4.1",
"2.4.52-1ubuntu4.2",
"2.4.52-1ubuntu4.3",
"2.4.52-1ubuntu4.4",
"2.4.52-1ubuntu4.5",
"2.4.52-1ubuntu4.6",
"2.4.52-1ubuntu4.7",
"2.4.52-1ubuntu4.8",
"2.4.52-1ubuntu4.9",
"2.4.52-1ubuntu4.10",
"2.4.52-1ubuntu4.11",
"2.4.52-1ubuntu4.12",
"2.4.52-1ubuntu4.13",
"2.4.52-1ubuntu4.14",
"2.4.52-1ubuntu4.15",
"2.4.52-1ubuntu4.16",
"2.4.52-1ubuntu4.18",
"2.4.52-1ubuntu4.19",
"2.4.52-1ubuntu4.20"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnginx-mod-http-auth-pam",
"binary_version": "1.18.0-6ubuntu14.15"
},
{
"binary_name": "libnginx-mod-http-cache-purge",
"binary_version": "1.18.0-6ubuntu14.15"
},
{
"binary_name": "libnginx-mod-http-dav-ext",
"binary_version": "1.18.0-6ubuntu14.15"
},
{
"binary_name": "libnginx-mod-http-echo",
"binary_version": "1.18.0-6ubuntu14.15"
},
{
"binary_name": "libnginx-mod-http-fancyindex",
"binary_version": "1.18.0-6ubuntu14.15"
},
{
"binary_name": "libnginx-mod-http-geoip",
"binary_version": "1.18.0-6ubuntu14.15"
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{
"binary_name": "libnginx-mod-http-geoip2",
"binary_version": "1.18.0-6ubuntu14.15"
},
{
"binary_name": "libnginx-mod-http-headers-more-filter",
"binary_version": "1.18.0-6ubuntu14.15"
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{
"binary_name": "libnginx-mod-http-image-filter",
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},
{
"binary_name": "libnginx-mod-http-ndk",
"binary_version": "1.18.0-6ubuntu14.15"
},
{
"binary_name": "libnginx-mod-http-perl",
"binary_version": "1.18.0-6ubuntu14.15"
},
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"aliases": [],
"details": "Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server\u0027s mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.",
"id": "UBUNTU-CVE-2026-49975",
"modified": "2026-07-21T10:43:28Z",
"published": "2026-06-03T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-49975"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-49975"
},
{
"type": "REPORT",
"url": "https://blog.calif.io/p/codex-discovered-a-hidden-http2-bomb"
},
{
"type": "REPORT",
"url": "https://github.com/icing/mod_h2/pull/324"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8384-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8398-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8398-2"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8398-3"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8571-1"
}
],
"related": [
"USN-8384-1",
"USN-8398-1",
"USN-8398-2",
"USN-8398-3",
"USN-8571-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-49975"
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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