{"id":"USN-9090-1","summary":"apache2 vulnerabilities","details":"Zhenpeng Lin discovered that Apache HTTP Server's mod_dav module\nincorrectly calculated memory sizes when handling WebDAV locks. An attacker\nwith permission to create WebDAV locks could possibly use this issue to\ncause Apache HTTP Server to crash, resulting in a denial of service.\n(CVE-2026-42528)\n\nIt was discovered that Apache HTTP Server's mod_vhost_alias module\nincorrectly handled certain requests, leading to a one-byte stack buffer\noverflow. A remote attacker could possibly use this issue to cause Apache\nHTTP Server to crash, resulting in a denial of service, or possibly execute\narbitrary code. (CVE-2026-109163)\n\nIt was discovered that Apache HTTP Server's mod_md module incorrectly\nhandled certain conditions, leading to a NULL pointer dereference. An\nattacker could possibly use this issue to cause Apache HTTP Server to\ncrash, resulting in a denial of service. This issue only affected Ubuntu\n20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu\n26.10. (CVE-2026-106023)\n\nIt was discovered that Apache HTTP Server's mod_http2 module incorrectly\nhandled certain request headers, leading to heap corruption. A remote\nattacker could possibly use this issue to cause Apache HTTP Server to\ncrash, resulting in a denial of service, or possibly execute arbitrary\ncode. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu\n24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-119618)\n\nFeliks Penconek, Yang Song, and JiaSheng He discovered that Apache HTTP\nServer could treat the target of some internal redirects from CGI programs\nas a CGI program. A remote attacker could possibly use this issue to\nexecute arbitrary code. This issue only affected Ubuntu 26.04 LTS and\nUbuntu 26.10. (CVE-2026-42356)","modified":"2026-11-13T11:28:23.486355243Z","published":"2026-11-12T21:25:57Z","related":["UBUNTU-CVE-2026-106023","UBUNTU-CVE-2026-109163","UBUNTU-CVE-2026-119618","UBUNTU-CVE-2026-42356","UBUNTU-CVE-2026-42528"],"upstream":["CVE-2026-106023","CVE-2026-109163","CVE-2026-119618","CVE-2026-42356","CVE-2026-42528","UBUNTU-CVE-2026-106023","UBUNTU-CVE-2026-109163","UBUNTU-CVE-2026-119618","UBUNTU-CVE-2026-42356","UBUNTU-CVE-2026-42528"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-9090-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42356"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42528"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-106023"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-109163"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-119618"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.7-1ubuntu4.22+esm19"}]}],"versions":["2.4.6-2ubuntu2","2.4.6-2ubuntu3","2.4.6-2ubuntu4","2.4.7-1ubuntu1","2.4.7-1ubuntu2","2.4.7-1ubuntu3","2.4.7-1ubuntu4","2.4.7-1ubuntu4.1","2.4.7-1ubuntu4.4","2.4.7-1ubuntu4.5","2.4.7-1ubuntu4.6","2.4.7-1ubuntu4.7","2.4.7-1ubuntu4.8","2.4.7-1ubuntu4.9","2.4.7-1ubuntu4.10","2.4.7-1ubuntu4.11","2.4.7-1ubuntu4.13","2.4.7-1ubuntu4.15","2.4.7-1ubuntu4.16","2.4.7-1ubuntu4.17","2.4.7-1ubuntu4.18","2.4.7-1ubuntu4.19","2.4.7-1ubuntu4.20","2.4.7-1ubuntu4.21","2.4.7-1ubuntu4.22","2.4.7-1ubuntu4.22+esm1","2.4.7-1ubuntu4.22+esm2","2.4.7-1ubuntu4.22+esm3","2.4.7-1ubuntu4.22+esm4","2.4.7-1ubuntu4.22+esm5","2.4.7-1ubuntu4.22+esm6","2.4.7-1ubuntu4.22+esm8","2.4.7-1ubuntu4.22+esm9","2.4.7-1ubuntu4.22+esm10","2.4.7-1ubuntu4.22+esm12","2.4.7-1ubuntu4.22+esm13","2.4.7-1ubuntu4.22+esm14","2.4.7-1ubuntu4.22+esm15","2.4.7-1ubuntu4.22+esm16","2.4.7-1ubuntu4.22+esm17","2.4.7-1ubuntu4.22+esm18"],"ecosystem_specific":{"binaries":[{"binary_name":"apache2","binary_version":"2.4.7-1ubuntu4.22+esm19"},{"binary_version":"2.4.7-1ubuntu4.22+esm19","binary_name":"apache2-bin"},{"binary_name":"apache2-data","binary_version":"2.4.7-1ubuntu4.22+esm19"},{"binary_name":"apache2-mpm-event","binary_version":"2.4.7-1ubuntu4.22+esm19"},{"binary_version":"2.4.7-1ubuntu4.22+esm19","binary_name":"apache2-mpm-itk"},{"binary_version":"2.4.7-1ubuntu4.22+esm19","binary_name":"apache2-mpm-prefork"},{"binary_name":"apache2-mpm-worker","binary_version":"2.4.7-1ubuntu4.22+esm19"},{"binary_name":"apache2-suexec","binary_version":"2.4.7-1ubuntu4.22+esm19"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.7-1ubuntu4.22+esm19"},{"binary_version":"2.4.7-1ubuntu4.22+esm19","binary_name":"apache2-suexec-pristine"},{"binary_version":"2.4.7-1ubuntu4.22+esm19","binary_name":"apache2-utils"},{"binary_version":"2.4.7-1ubuntu4.22+esm19","binary_name":"apache2.2-bin"},{"binary_version":"1:2.4.7-1ubuntu4.22+esm19","binary_name":"libapache2-mod-macro"},{"binary_version":"1:2.4.7-1ubuntu4.22+esm19","binary_name":"libapache2-mod-proxy-html"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"id":"CVE-2026-42528","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-109163","severity":[{"score":"low","type":"Ubuntu"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9090-1.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.18-2ubuntu3.17+esm24"}]}],"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","2.4.18-2ubuntu3.17+esm19","2.4.18-2ubuntu3.17+esm20","2.4.18-2ubuntu3.17+esm21","2.4.18-2ubuntu3.17+esm22","2.4.18-2ubuntu3.17+esm23"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.18-2ubuntu3.17+esm24","binary_name":"apache2"},{"binary_name":"apache2-bin","binary_version":"2.4.18-2ubuntu3.17+esm24"},{"binary_name":"apache2-data","binary_version":"2.4.18-2ubuntu3.17+esm24"},{"binary_version":"2.4.18-2ubuntu3.17+esm24","binary_name":"apache2-suexec-custom"},{"binary_version":"2.4.18-2ubuntu3.17+esm24","binary_name":"apache2-suexec-pristine"},{"binary_name":"apache2-utils","binary_version":"2.4.18-2ubuntu3.17+esm24"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9090-1.json","cves_map":{"cves":[{"id":"CVE-2026-42528","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-109163","severity":[{"type":"Ubuntu","score":"low"}]}],"ecosystem":"Ubuntu:Pro:16.04:LTS"}}},{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.29-1ubuntu4.27+esm15"}]}],"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","2.4.29-1ubuntu4.27+esm10","2.4.29-1ubuntu4.27+esm11","2.4.29-1ubuntu4.27+esm12","2.4.29-1ubuntu4.27+esm13","2.4.29-1ubuntu4.27+esm14"],"ecosystem_specific":{"binaries":[{"binary_name":"apache2","binary_version":"2.4.29-1ubuntu4.27+esm15"},{"binary_version":"2.4.29-1ubuntu4.27+esm15","binary_name":"apache2-bin"},{"binary_name":"apache2-data","binary_version":"2.4.29-1ubuntu4.27+esm15"},{"binary_version":"2.4.29-1ubuntu4.27+esm15","binary_name":"apache2-suexec-custom"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.29-1ubuntu4.27+esm15"},{"binary_version":"2.4.29-1ubuntu4.27+esm15","binary_name":"apache2-utils"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9090-1.json","cves_map":{"cves":[{"id":"CVE-2026-42528","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"low","type":"Ubuntu"}],"id":"CVE-2026-109163"}],"ecosystem":"Ubuntu:Pro:18.04:LTS"}}},{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.41-4ubuntu3.23+esm11"}]}],"versions":["2.4.41-1ubuntu1","2.4.41-4ubuntu1","2.4.41-4ubuntu2","2.4.41-4ubuntu3","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","2.4.41-4ubuntu3.23+esm5","2.4.41-4ubuntu3.23+esm6","2.4.41-4ubuntu3.23+esm7","2.4.41-4ubuntu3.23+esm8","2.4.41-4ubuntu3.23+esm9","2.4.41-4ubuntu3.23+esm10"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"2.4.41-4ubuntu3.23+esm11","binary_name":"apache2"},{"binary_name":"apache2-bin","binary_version":"2.4.41-4ubuntu3.23+esm11"},{"binary_version":"2.4.41-4ubuntu3.23+esm11","binary_name":"apache2-data"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.41-4ubuntu3.23+esm11"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.41-4ubuntu3.23+esm11"},{"binary_version":"2.4.41-4ubuntu3.23+esm11","binary_name":"apache2-utils"},{"binary_version":"2.4.41-4ubuntu3.23+esm11","binary_name":"libapache2-mod-md"},{"binary_name":"libapache2-mod-proxy-uwsgi","binary_version":"2.4.41-4ubuntu3.23+esm11"}]},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-42528"},{"severity":[{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-106023"},{"id":"CVE-2026-109163","severity":[{"score":"low","type":"Ubuntu"}]},{"id":"CVE-2026-119618","severity":[{"type":"Ubuntu","score":"high"}]}],"ecosystem":"Ubuntu:Pro:20.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-9090-1.json"}},{"package":{"name":"apache2","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.52-1ubuntu4.27"}]}],"versions":["2.4.48-3.1ubuntu3","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","2.4.52-1ubuntu4.21","2.4.52-1ubuntu4.23","2.4.52-1ubuntu4.24","2.4.52-1ubuntu4.25","2.4.52-1ubuntu4.26"],"ecosystem_specific":{"availability":"No 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