Fix CVE(s): CVE-2026-28780, CVE-2026-44186
* SECURITY UPDATE: heap buffer overflow in mod_proxy_ajp message header length check - debian/patches/CVE-2026-28780.patch: account for the AJP header bytes in the incoming-message size check (msglen > max_size - AJP_HEADER_LEN) in ajp_msg_check_header() so a crafted length can no longer let msg->len exceed the allocated buffer and overflow the heap in modules/proxy/ajp_msg.c. Upstream fix d04119e6e591f7b21222e749387a8b39e9092a1b (SVN r1935348). - CVE-2026-28780 * SECURITY UPDATE: infinite loop (DoS) in mod_proxy_ftp Retry-After parsing - debian/patches/CVE-2026-44186.patch: advance secs_str inside the scan loop (add the missing secs_str++) in proxy_ftp_handler() so the Retry-After number search makes progress instead of spinning forever on a malicious backend FTP response in modules/proxy/mod_proxy_ftp.c. Upstream fix 414de374a06549b2c6710cbcff81c3821379f75c (SVN r1935004). - CVE-2026-44186
- Products
- apache2, apache2-bin, apache2-data, apache2-dev, apache2-doc, apache2-ssl-dev, apache2-suexec-custom, apache2-suexec-pristine, apache2-utils, libapache2-mod-md, libapache2-mod-proxy-uwsgi
- Affected versions
- Not specified
- Fixed versions
- 2.4.41-4ubuntu3.23+tuxcare.els6
- CVEs
- CVE-2026-28780, CVE-2026-44186
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:44 UTC · Revision 1
Source evidence
Fix CVE(s): CVE-2026-28780, CVE-2026-44186
core-osv · Original sourcePublished 15 Jun 2026, 21:01 UTC
* SECURITY UPDATE: heap buffer overflow in mod_proxy_ajp message header length check - debian/patches/CVE-2026-28780.patch: account for the AJP header bytes in the incoming-message size check (msglen > max_size - AJP_HEADER_LEN) in ajp_msg_check_header() so a crafted length can no longer let msg->len exceed the allocated buffer and overflow the heap in modules/proxy/ajp_msg.c. Upstream fix d04119e6e591f7b21222e749387a8b39e9092a1b (SVN r1935348). - CVE-2026-28780 * SECURITY UPDATE: infinite loop (DoS) in mod_proxy_ftp Retry-After parsing - debian/patches/CVE-2026-44186.patch: advance secs_str inside the scan loop (add the missing secs_str++) in proxy_ftp_handler() so the Retry-After number search makes progress instead of spinning forever on a malicious backend FTP response in modules/proxy/mod_proxy_ftp.c. Upstream fix 414de374a06549b2c6710cbcff81c3821379f75c (SVN r1935004). - CVE-2026-44186
osv:CLSA-2026-1781557190
apache2
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
apache2-bin
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
apache2-data
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
apache2-dev
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
apache2-doc
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
apache2-ssl-dev
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
apache2-suexec-custom
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
apache2-suexec-pristine
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
apache2-utils
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
libapache2-mod-md
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
libapache2-mod-proxy-uwsgi
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els6
Complete source record
{
"id": "703eeace93b12233881fdbf2d091d1e7dcfdd397ea133a1a4a2c9bf4765fa826",
"url": "https://osv.dev/vulnerability/CLSA-2026-1781557190",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-28780, CVE-2026-44186",
"summary": "* SECURITY UPDATE: heap buffer overflow in mod_proxy_ajp message header length check - debian/patches/CVE-2026-28780.patch: account for the AJP header bytes in the incoming-message size check (msglen > max_size - AJP_HEADER_LEN) in ajp_msg_check_header() so a crafted length can no longer let msg->len exceed the allocated buffer and overflow the heap in modules/proxy/ajp_msg.c. Upstream fix d04119e6e591f7b21222e749387a8b39e9092a1b (SVN r1935348). - CVE-2026-28780 * SECURITY UPDATE: infinite loop (DoS) in mod_proxy_ftp Retry-After parsing - debian/patches/CVE-2026-44186.patch: advance secs_str inside the scan loop (add the missing secs_str++) in proxy_ftp_handler() so the Retry-After number search makes progress instead of spinning forever on a malicious backend FTP response in modules/proxy/mod_proxy_ftp.c. Upstream fix 414de374a06549b2c6710cbcff81c3821379f75c (SVN r1935004). - CVE-2026-44186",
"evidence": "osv:CLSA-2026-1781557190",
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/9/package/name"
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"prerequisites": [],
"fixed_versions": [
{
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/10/package/name"
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"severity": "unknown",
"structured": {
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"aliases": [
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"package": {
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"purl": "pkg:deb/tuxcare/apache2-bin?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
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"database_specific": {
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{
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"package": {
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"purl": "pkg:deb/tuxcare/apache2-data?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
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"package": {
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"purl": "pkg:deb/tuxcare/apache2-dev?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
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"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1781557190.json"
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],
"package": {
"name": "apache2-doc",
"purl": "pkg:deb/tuxcare/apache2-doc?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
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}
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],
"package": {
"name": "apache2-ssl-dev",
"purl": "pkg:deb/tuxcare/apache2-ssl-dev?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
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"database_specific": {
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"package": {
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},
"database_specific": {
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"ecosystem": "TuxCare:Ubuntu:20.04"
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],
"package": {
"name": "libapache2-mod-md",
"purl": "pkg:deb/tuxcare/libapache2-mod-md?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
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},
{
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],
"package": {
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"purl": "pkg:deb/tuxcare/libapache2-mod-proxy-uwsgi?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1781557190.json"
}
}
],
"modified": "2026-10-26T09:32:05.332876294Z",
"provider": "osv",
"upstream": [
"CVE-2026-28780",
"CVE-2026-44186"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1781557190.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-28780",
"https://nvd.nist.gov/vuln/detail/CVE-2026-44186"
]
},
"related_cves": [
{
"value": "CVE-2026-28780",
"evidence": "/upstream"
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{
"value": "CVE-2026-44186",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449680,
"published_at": "2026-06-15T21:01:38+00:00"
}