Fix of 5 CVEs
* SECURITY UPDATE: out-of-bounds write in mod_charset_lite - debian/patches/CVE-2026-56153.patch: in finish_partial_char() in modules/filters/mod_charset_lite.c, stop accumulating a split multibyte character once ctx->saved reaches the size of ctx->buf so the next byte can no longer be written past the 8-byte buffer. Backported from httpd commit 6654234dcb395e07fd62255670356f84ec733195 (SVN r1938658). - CVE-2026-56153 * SECURITY UPDATE: use-after-free in mod_rewrite lookahead variables - debian/patches/CVE-2026-56154.patch: in lookup_variable() in modules/mappers/mod_rewrite.c, copy ctx->vary_this into the main request pool after an LA-U/LA-F lookahead sub-request so the Vary header name no longer points into the destroyed sub-request pool. Backported from httpd commit 6e4d1e614597109909dda495d235b6a1331d7beb (SVN r1938660). - CVE-2026-56154 * SECURITY UPDATE: out-of-bounds write in mod_proxy_html - debian/patches/CVE-2026-56449.patch: in pcomment() in modules/filters/mod_proxy_html.c, do not call dump_content() after writing an HTML comment so crafted response bodies can no longer trigger a write outside the output buffer. Backported from httpd commit c721d4e1cf5c142149509490015cef1a75715595 (SVN r1935931). - CVE-2026-56449 * SECURITY UPDATE: stack-based buffer overflow in mod_vhost_alias - debian/patches/CVE-2026-63292.patch: in vhost_alias_checkspace() and vhost_alias_interpolate() in modules/mappers/mod_vhost_alias.c, reject a single expanded segment (e.g. a Host header)
- 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.els15
- CVEs
- CVE-2026-56153, CVE-2026-56154, CVE-2026-56449, CVE-2026-57941, CVE-2026-63292
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:53 UTC · Revision 1
Source evidence
* SECURITY UPDATE: out-of-bounds write in mod_charset_lite - debian/patches/CVE-2026-56153.patch: in finish_partial_char() in modules/filters/mod_charset_lite.c, stop accumulating a split multibyte character once ctx->saved reaches the size of ctx->buf so the next byte can no longer be written past the 8-byte buffer. Backported from httpd commit 6654234dcb395e07fd62255670356f84ec733195 (SVN r1938658). - CVE-2026-56153 * SECURITY UPDATE: use-after-free in mod_rewrite lookahead variables - debian/patches/CVE-2026-56154.patch: in lookup_variable() in modules/mappers/mod_rewrite.c, copy ctx->vary_this into the main request pool after an LA-U/LA-F lookahead sub-request so the Vary header name no longer points into the destroyed sub-request pool. Backported from httpd commit 6e4d1e614597109909dda495d235b6a1331d7beb (SVN r1938660). - CVE-2026-56154 * SECURITY UPDATE: out-of-bounds write in mod_proxy_html - debian/patches/CVE-2026-56449.patch: in pcomment() in modules/filters/mod_proxy_html.c, do not call dump_content() after writing an HTML comment so crafted response bodies can no longer trigger a write outside the output buffer. Backported from httpd commit c721d4e1cf5c142149509490015cef1a75715595 (SVN r1935931). - CVE-2026-56449 * SECURITY UPDATE: stack-based buffer overflow in mod_vhost_alias - debian/patches/CVE-2026-63292.patch: in vhost_alias_checkspace() and vhost_alias_interpolate() in modules/mappers/mod_vhost_alias.c, reject a single expanded segment (e.g. a Host header)
osv:CLSA-2026-1791447288
apache2
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
apache2-bin
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
apache2-data
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
apache2-dev
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
apache2-doc
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
apache2-ssl-dev
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
apache2-suexec-custom
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
apache2-suexec-pristine
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
apache2-utils
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
libapache2-mod-md
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
libapache2-mod-proxy-uwsgi
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els15
Complete source record
{
"id": "e35bd6ee34de9ccbe37e0033db2e8579290a7333d2d1eeb3948d21da14e9b141",
"url": "https://osv.dev/vulnerability/CLSA-2026-1791447288",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix of 5 CVEs",
"summary": "* SECURITY UPDATE: out-of-bounds write in mod_charset_lite - debian/patches/CVE-2026-56153.patch: in finish_partial_char() in modules/filters/mod_charset_lite.c, stop accumulating a split multibyte character once ctx->saved reaches the size of ctx->buf so the next byte can no longer be written past the 8-byte buffer. Backported from httpd commit 6654234dcb395e07fd62255670356f84ec733195 (SVN r1938658). - CVE-2026-56153 * SECURITY UPDATE: use-after-free in mod_rewrite lookahead variables - debian/patches/CVE-2026-56154.patch: in lookup_variable() in modules/mappers/mod_rewrite.c, copy ctx->vary_this into the main request pool after an LA-U/LA-F lookahead sub-request so the Vary header name no longer points into the destroyed sub-request pool. Backported from httpd commit 6e4d1e614597109909dda495d235b6a1331d7beb (SVN r1938660). - CVE-2026-56154 * SECURITY UPDATE: out-of-bounds write in mod_proxy_html - debian/patches/CVE-2026-56449.patch: in pcomment() in modules/filters/mod_proxy_html.c, do not call dump_content() after writing an HTML comment so crafted response bodies can no longer trigger a write outside the output buffer. Backported from httpd commit c721d4e1cf5c142149509490015cef1a75715595 (SVN r1935931). - CVE-2026-56449 * SECURITY UPDATE: stack-based buffer overflow in mod_vhost_alias - debian/patches/CVE-2026-63292.patch: in vhost_alias_checkspace() and vhost_alias_interpolate() in modules/mappers/mod_vhost_alias.c, reject a single expanded segment (e.g. a Host header) ",
"evidence": "osv:CLSA-2026-1791447288",
"products": [
{
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},
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"evidence": "/affected/0/ranges"
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{
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{
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{
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{
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{
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{
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{
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"evidence": "/affected/6/ranges"
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],
"affected_versions": []
},
{
"name": {
"value": "apache2-suexec-pristine",
"evidence": "/affected/7/package/name"
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"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-utils",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els15",
"evidence": "/affected/8/ranges"
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"affected_versions": []
},
{
"name": {
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"evidence": "/affected/9/package/name"
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"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els15",
"evidence": "/affected/9/ranges"
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"affected_versions": []
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{
"name": {
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"evidence": "/affected/10/package/name"
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"fixed_versions": [
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],
"affected_versions": []
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],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1791447288",
"aliases": [
"CLSA-2026-1791447288"
],
"affected": [
{
"ranges": [
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{
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],
"package": {
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"purl": "pkg:deb/tuxcare/apache2?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-2026-1791447288.json"
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{
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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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},
{
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"package": {
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"purl": "pkg:deb/tuxcare/apache2-dev?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-2026-1791447288.json"
}
},
{
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}
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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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{
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],
"package": {
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"purl": "pkg:deb/tuxcare/apache2-ssl-dev?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-2026-1791447288.json"
}
},
{
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"package": {
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"ecosystem": "TuxCare:Ubuntu:20.04"
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{
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"package": {
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"purl": "pkg:deb/tuxcare/apache2-utils?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
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{
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"package": {
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"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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{
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],
"package": {
"name": "libapache2-mod-proxy-uwsgi",
"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-2026-1791447288.json"
}
}
],
"modified": "2026-10-26T09:43:41.276393626Z",
"provider": "osv",
"upstream": [
"CVE-2026-56153",
"CVE-2026-56154",
"CVE-2026-56449",
"CVE-2026-57941",
"CVE-2026-63292"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1791447288.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-56153",
"https://nvd.nist.gov/vuln/detail/CVE-2026-56154",
"https://nvd.nist.gov/vuln/detail/CVE-2026-56449",
"https://nvd.nist.gov/vuln/detail/CVE-2026-57941",
"https://nvd.nist.gov/vuln/detail/CVE-2026-63292"
]
},
"related_cves": [
{
"value": "CVE-2026-56153",
"evidence": "/upstream"
},
{
"value": "CVE-2026-56154",
"evidence": "/upstream"
},
{
"value": "CVE-2026-56449",
"evidence": "/upstream"
},
{
"value": "CVE-2026-57941",
"evidence": "/upstream"
},
{
"value": "CVE-2026-63292",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 450076,
"published_at": "2026-10-08T08:15:07+00:00"
}