Fix CVE(s): CVE-2026-29167, CVE-2026-34355, CVE-2026-34356
* SECURITY UPDATE: use-after-free in mod_ldap per-directory client certificate configuration - debian/patches/CVE-2026-29167.patch: deep-copy the per-directory client_certs array (each cert path and password) into the connection pool in uldap_connection_find() so the cached connection no longer retains pointers into the short-lived per-directory config pool in modules/ldap/util_ldap.c. - CVE-2026-29167 * SECURITY UPDATE: buffer overflow in mod_proxy_html with an untrusted backend response - debian/patches/CVE-2026-34355.patch: replace the hand-managed preserve()/pappend() output buffer with the bounds-checked ap_varbuf API (ap_varbuf_grow, ap_varbuf_strmemcat, ap_varbuf_regsub) for the CDATA, element and event URL rewrites so an oversized substitution can no longer overflow the buffer in modules/filters/mod_proxy_html.c. - CVE-2026-34355 * SECURITY UPDATE: heap buffer overflow in mod_proxy ProxyPassReverseCookie handling with a malicious backend response - debian/patches/CVE-2026-34356.patch: reset newpath/pdiff and newdomain/ddiff for each path= and domain= cookie attribute in ap_proxy_cookie_reverse_map() so a duplicate attribute can no longer reuse a stale length offset and overflow the rewritten cookie buffer in modules/proxy/proxy_util.c. - CVE-2026-34356
- 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.els5
- CVEs
- CVE-2026-29167, CVE-2026-34355, CVE-2026-34356
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:44 UTC · Revision 1
Source evidence
Fix CVE(s): CVE-2026-29167, CVE-2026-34355, CVE-2026-34356
core-osv · Original sourcePublished 12 Jun 2026, 14:15 UTC
* SECURITY UPDATE: use-after-free in mod_ldap per-directory client certificate configuration - debian/patches/CVE-2026-29167.patch: deep-copy the per-directory client_certs array (each cert path and password) into the connection pool in uldap_connection_find() so the cached connection no longer retains pointers into the short-lived per-directory config pool in modules/ldap/util_ldap.c. - CVE-2026-29167 * SECURITY UPDATE: buffer overflow in mod_proxy_html with an untrusted backend response - debian/patches/CVE-2026-34355.patch: replace the hand-managed preserve()/pappend() output buffer with the bounds-checked ap_varbuf API (ap_varbuf_grow, ap_varbuf_strmemcat, ap_varbuf_regsub) for the CDATA, element and event URL rewrites so an oversized substitution can no longer overflow the buffer in modules/filters/mod_proxy_html.c. - CVE-2026-34355 * SECURITY UPDATE: heap buffer overflow in mod_proxy ProxyPassReverseCookie handling with a malicious backend response - debian/patches/CVE-2026-34356.patch: reset newpath/pdiff and newdomain/ddiff for each path= and domain= cookie attribute in ap_proxy_cookie_reverse_map() so a duplicate attribute can no longer reuse a stale length offset and overflow the rewritten cookie buffer in modules/proxy/proxy_util.c. - CVE-2026-34356
osv:CLSA-2026-1781273712
apache2
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
apache2-bin
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
apache2-data
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
apache2-dev
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
apache2-doc
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
apache2-ssl-dev
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
apache2-suexec-custom
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
apache2-suexec-pristine
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
apache2-utils
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
libapache2-mod-md
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
libapache2-mod-proxy-uwsgi
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els5
Complete source record
{
"id": "07691d8ec685d191e8452095a2b25088c6875d63bcc4e90ab46437abd41d65c0",
"url": "https://osv.dev/vulnerability/CLSA-2026-1781273712",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-29167, CVE-2026-34355, CVE-2026-34356",
"summary": "* SECURITY UPDATE: use-after-free in mod_ldap per-directory client certificate configuration - debian/patches/CVE-2026-29167.patch: deep-copy the per-directory client_certs array (each cert path and password) into the connection pool in uldap_connection_find() so the cached connection no longer retains pointers into the short-lived per-directory config pool in modules/ldap/util_ldap.c. - CVE-2026-29167 * SECURITY UPDATE: buffer overflow in mod_proxy_html with an untrusted backend response - debian/patches/CVE-2026-34355.patch: replace the hand-managed preserve()/pappend() output buffer with the bounds-checked ap_varbuf API (ap_varbuf_grow, ap_varbuf_strmemcat, ap_varbuf_regsub) for the CDATA, element and event URL rewrites so an oversized substitution can no longer overflow the buffer in modules/filters/mod_proxy_html.c. - CVE-2026-34355 * SECURITY UPDATE: heap buffer overflow in mod_proxy ProxyPassReverseCookie handling with a malicious backend response - debian/patches/CVE-2026-34356.patch: reset newpath/pdiff and newdomain/ddiff for each path= and domain= cookie attribute in ap_proxy_cookie_reverse_map() so a duplicate attribute can no longer reuse a stale length offset and overflow the rewritten cookie buffer in modules/proxy/proxy_util.c. - CVE-2026-34356",
"evidence": "osv:CLSA-2026-1781273712",
"products": [
{
"name": {
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},
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{
"name": {
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"evidence": "/affected/1/ranges"
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{
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{
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{
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{
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}
],
"affected_versions": []
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{
"name": {
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"evidence": "/affected/5/package/name"
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"prerequisites": [],
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{
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],
"affected_versions": []
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{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/6/ranges"
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],
"affected_versions": []
},
{
"name": {
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"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.els5",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libapache2-mod-md",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els5",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libapache2-mod-proxy-uwsgi",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1781273712",
"aliases": [
"CLSA-2026-1781273712"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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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-2026-1781273712.json"
}
},
{
"ranges": [
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"events": [
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{
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}
]
}
],
"package": {
"name": "apache2-bin",
"purl": "pkg:deb/tuxcare/apache2-bin?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-2026-1781273712.json"
}
},
{
"ranges": [
{
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"events": [
{
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{
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}
]
}
],
"package": {
"name": "apache2-data",
"purl": "pkg:deb/tuxcare/apache2-data?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-2026-1781273712.json"
}
},
{
"ranges": [
{
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{
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{
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}
]
}
],
"package": {
"name": "apache2-dev",
"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-2026-1781273712.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els5"
}
]
}
],
"package": {
"name": "apache2-doc",
"purl": "pkg:deb/tuxcare/apache2-doc?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-2026-1781273712.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els5"
}
]
}
],
"package": {
"name": "apache2-ssl-dev",
"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-2026-1781273712.json"
}
},
{
"ranges": [
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{
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}
]
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],
"package": {
"name": "apache2-suexec-custom",
"purl": "pkg:deb/tuxcare/apache2-suexec-custom?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-2026-1781273712.json"
}
},
{
"ranges": [
{
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{
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}
]
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],
"package": {
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"purl": "pkg:deb/tuxcare/apache2-suexec-pristine?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-2026-1781273712.json"
}
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{
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]
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],
"package": {
"name": "apache2-utils",
"purl": "pkg:deb/tuxcare/apache2-utils?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-2026-1781273712.json"
}
},
{
"ranges": [
{
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{
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{
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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": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1781273712.json"
}
},
{
"ranges": [
{
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"events": [
{
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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-2026-1781273712.json"
}
}
],
"modified": "2026-10-26T09:32:05.229614476Z",
"provider": "osv",
"upstream": [
"CVE-2026-29167",
"CVE-2026-34355",
"CVE-2026-34356"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1781273712.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-29167",
"https://nvd.nist.gov/vuln/detail/CVE-2026-34355",
"https://nvd.nist.gov/vuln/detail/CVE-2026-34356"
]
},
"related_cves": [
{
"value": "CVE-2026-29167",
"evidence": "/upstream"
},
{
"value": "CVE-2026-34355",
"evidence": "/upstream"
},
{
"value": "CVE-2026-34356",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449670,
"published_at": "2026-06-12T14:15:36+00:00"
}