UnratedFix available
Fix CVE(s): CVE-2026-42536
Type: advisorySources: OSV
* SECURITY UPDATE: mod_xml2enc heap-based buffer overflow via xml2StartParse with untrusted content - debian/patches/CVE-2026-42536.patch: add the missing ctx->bblen -= (p-ctx->buf) accounting in fix_skipto() in modules/filters/mod_xml2enc.c so the bblen byte-length counter stays in sync with bytes when leading content is skipped, preventing a heap buffer overflow. Upstream fix cb1f79c0ce66393c48657b19df754f16b79af543 (SVN r1934971). - CVE-2026-42536
- 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.els9
- CVEs
- CVE-2026-42536
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:44 UTC · Revision 1
Source evidence
* SECURITY UPDATE: mod_xml2enc heap-based buffer overflow via xml2StartParse with untrusted content - debian/patches/CVE-2026-42536.patch: add the missing ctx->bblen -= (p-ctx->buf) accounting in fix_skipto() in modules/filters/mod_xml2enc.c so the bblen byte-length counter stays in sync with bytes when leading content is skipped, preventing a heap buffer overflow. Upstream fix cb1f79c0ce66393c48657b19df754f16b79af543 (SVN r1934971). - CVE-2026-42536
osv:CLSA-2026-1782299145
apache2
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
apache2-bin
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
apache2-data
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
apache2-dev
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
apache2-doc
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
apache2-ssl-dev
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
apache2-suexec-custom
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
apache2-suexec-pristine
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
apache2-utils
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
libapache2-mod-md
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
libapache2-mod-proxy-uwsgi
Fixed versions: 2.4.41-4ubuntu3.23+tuxcare.els9
Complete source record
{
"id": "9c7a2d26a18d2b0c9b037191c77a66612341753c745e30dfa37aa43241158587",
"url": "https://osv.dev/vulnerability/CLSA-2026-1782299145",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-42536",
"summary": "* SECURITY UPDATE: mod_xml2enc heap-based buffer overflow via xml2StartParse with untrusted content - debian/patches/CVE-2026-42536.patch: add the missing ctx->bblen -= (p-ctx->buf) accounting in fix_skipto() in modules/filters/mod_xml2enc.c so the bblen byte-length counter stays in sync with bytes when leading content is skipped, preventing a heap buffer overflow. Upstream fix cb1f79c0ce66393c48657b19df754f16b79af543 (SVN r1934971). - CVE-2026-42536",
"evidence": "osv:CLSA-2026-1782299145",
"products": [
{
"name": {
"value": "apache2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els9",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-bin",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els9",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-data",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els9",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-dev",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els9",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-doc",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els9",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-ssl-dev",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els9",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-suexec-custom",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els9",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-suexec-pristine",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els9",
"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.els9",
"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.els9",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libapache2-mod-proxy-uwsgi",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.41-4ubuntu3.23+tuxcare.els9",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1782299145",
"aliases": [
"CLSA-2026-1782299145"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"package": {
"name": "apache2",
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"package": {
"name": "apache2-suexec-pristine",
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"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-2026-1782299145.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.41-4ubuntu3.23+tuxcare.els9"
}
]
}
],
"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-2026-1782299145.json"
}
}
],
"modified": "2026-10-26T09:32:05.223356912Z",
"provider": "osv",
"upstream": [
"CVE-2026-42536"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1782299145.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42536"
]
},
"related_cves": [
{
"value": "CVE-2026-42536",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449668,
"published_at": "2026-06-24T11:06:02+00:00"
}