Fix of 5 CVEs
* SECURITY UPDATE: use-after-free in mod_rewrite lookahead variables - debian/patches/CVE-2026-56154.patch: copy the Vary value gathered during a LA-U/LA-F lookahead into the main request pool before the sub-request is destroyed in modules/mappers/mod_rewrite.c. - CVE-2026-56154 * SECURITY UPDATE: buffer overflow in mod_vhost_alias interpolation - debian/patches/CVE-2026-63292.patch: reject a VirtualDocumentRoot expansion segment that does not fit the buffer in modules/mappers/mod_vhost_alias.c. - CVE-2026-63292 * SECURITY UPDATE: crash in mod_xml2enc on incomplete input - debian/patches/CVE-2026-63686.patch: handle APR_INCOMPLETE from the converter and pass the rest raw after a conversion failure instead of reusing a NULL converter in modules/filters/mod_xml2enc.c. - CVE-2026-63686 * SECURITY UPDATE: digest replay and use-after-free in mod_auth_digest - debian/patches/CVE-2026-73636_CVE-2026-73637.patch: enforce one-time nonce and nonce-count handling, and only use shared client entries under the client lock, in modules/aaa/mod_auth_digest.c. - CVE-2026-73636 - CVE-2026-73637
- Products
- apache2, apache2-bin, apache2-data, apache2-dev, apache2-doc, apache2-ssl-dev, apache2-suexec-custom, apache2-suexec-pristine, apache2-utils
- Affected versions
- Not specified
- Fixed versions
- 2.4.29-1ubuntu4.27+tuxcare.els16
- CVEs
- CVE-2026-56154, CVE-2026-63292, CVE-2026-63686, CVE-2026-73636, CVE-2026-73637
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:43 UTC · Revision 1
Source evidence
* SECURITY UPDATE: use-after-free in mod_rewrite lookahead variables - debian/patches/CVE-2026-56154.patch: copy the Vary value gathered during a LA-U/LA-F lookahead into the main request pool before the sub-request is destroyed in modules/mappers/mod_rewrite.c. - CVE-2026-56154 * SECURITY UPDATE: buffer overflow in mod_vhost_alias interpolation - debian/patches/CVE-2026-63292.patch: reject a VirtualDocumentRoot expansion segment that does not fit the buffer in modules/mappers/mod_vhost_alias.c. - CVE-2026-63292 * SECURITY UPDATE: crash in mod_xml2enc on incomplete input - debian/patches/CVE-2026-63686.patch: handle APR_INCOMPLETE from the converter and pass the rest raw after a conversion failure instead of reusing a NULL converter in modules/filters/mod_xml2enc.c. - CVE-2026-63686 * SECURITY UPDATE: digest replay and use-after-free in mod_auth_digest - debian/patches/CVE-2026-73636_CVE-2026-73637.patch: enforce one-time nonce and nonce-count handling, and only use shared client entries under the client lock, in modules/aaa/mod_auth_digest.c. - CVE-2026-73636 - CVE-2026-73637
osv:CLSA-2026-1791450651
apache2
Fixed versions: 2.4.29-1ubuntu4.27+tuxcare.els16
apache2-bin
Fixed versions: 2.4.29-1ubuntu4.27+tuxcare.els16
apache2-data
Fixed versions: 2.4.29-1ubuntu4.27+tuxcare.els16
apache2-dev
Fixed versions: 2.4.29-1ubuntu4.27+tuxcare.els16
apache2-doc
Fixed versions: 2.4.29-1ubuntu4.27+tuxcare.els16
apache2-ssl-dev
Fixed versions: 2.4.29-1ubuntu4.27+tuxcare.els16
apache2-suexec-custom
Fixed versions: 2.4.29-1ubuntu4.27+tuxcare.els16
apache2-suexec-pristine
Fixed versions: 2.4.29-1ubuntu4.27+tuxcare.els16
apache2-utils
Fixed versions: 2.4.29-1ubuntu4.27+tuxcare.els16
Complete source record
{
"id": "5b9ba05672e8ce8ef427608254dd361c4e46e7fdb7a1fa3ebb1aa8f7ee69faa7",
"url": "https://osv.dev/vulnerability/CLSA-2026-1791450651",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix of 5 CVEs",
"summary": "* SECURITY UPDATE: use-after-free in mod_rewrite lookahead variables - debian/patches/CVE-2026-56154.patch: copy the Vary value gathered during a LA-U/LA-F lookahead into the main request pool before the sub-request is destroyed in modules/mappers/mod_rewrite.c. - CVE-2026-56154 * SECURITY UPDATE: buffer overflow in mod_vhost_alias interpolation - debian/patches/CVE-2026-63292.patch: reject a VirtualDocumentRoot expansion segment that does not fit the buffer in modules/mappers/mod_vhost_alias.c. - CVE-2026-63292 * SECURITY UPDATE: crash in mod_xml2enc on incomplete input - debian/patches/CVE-2026-63686.patch: handle APR_INCOMPLETE from the converter and pass the rest raw after a conversion failure instead of reusing a NULL converter in modules/filters/mod_xml2enc.c. - CVE-2026-63686 * SECURITY UPDATE: digest replay and use-after-free in mod_auth_digest - debian/patches/CVE-2026-73636_CVE-2026-73637.patch: enforce one-time nonce and nonce-count handling, and only use shared client entries under the client lock, in modules/aaa/mod_auth_digest.c. - CVE-2026-73636 - CVE-2026-73637",
"evidence": "osv:CLSA-2026-1791450651",
"products": [
{
"name": {
"value": "apache2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.29-1ubuntu4.27+tuxcare.els16",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-bin",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.29-1ubuntu4.27+tuxcare.els16",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-data",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.29-1ubuntu4.27+tuxcare.els16",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-dev",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.29-1ubuntu4.27+tuxcare.els16",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-doc",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.29-1ubuntu4.27+tuxcare.els16",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-ssl-dev",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.29-1ubuntu4.27+tuxcare.els16",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-suexec-custom",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.29-1ubuntu4.27+tuxcare.els16",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-suexec-pristine",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.29-1ubuntu4.27+tuxcare.els16",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "apache2-utils",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.4.29-1ubuntu4.27+tuxcare.els16",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1791450651",
"aliases": [
"CLSA-2026-1791450651"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.29-1ubuntu4.27+tuxcare.els16"
}
]
}
],
"package": {
"name": "apache2",
"purl": "pkg:deb/tuxcare/apache2?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1791450651.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.29-1ubuntu4.27+tuxcare.els16"
}
]
}
],
"package": {
"name": "apache2-bin",
"purl": "pkg:deb/tuxcare/apache2-bin?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1791450651.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.29-1ubuntu4.27+tuxcare.els16"
}
]
}
],
"package": {
"name": "apache2-data",
"purl": "pkg:deb/tuxcare/apache2-data?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1791450651.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.29-1ubuntu4.27+tuxcare.els16"
}
]
}
],
"package": {
"name": "apache2-dev",
"purl": "pkg:deb/tuxcare/apache2-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1791450651.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2.4.29-1ubuntu4.27+tuxcare.els16"
}
]
}
],
"package": {
"name": "apache2-doc",
"purl": "pkg:deb/tuxcare/apache2-doc?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1791450651.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2.4.29-1ubuntu4.27+tuxcare.els16"
}
]
}
],
"package": {
"name": "apache2-ssl-dev",
"purl": "pkg:deb/tuxcare/apache2-ssl-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1791450651.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "apache2-suexec-custom",
"purl": "pkg:deb/tuxcare/apache2-suexec-custom?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1791450651.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.29-1ubuntu4.27+tuxcare.els16"
}
]
}
],
"package": {
"name": "apache2-suexec-pristine",
"purl": "pkg:deb/tuxcare/apache2-suexec-pristine?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1791450651.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.29-1ubuntu4.27+tuxcare.els16"
}
]
}
],
"package": {
"name": "apache2-utils",
"purl": "pkg:deb/tuxcare/apache2-utils?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1791450651.json"
}
}
],
"modified": "2026-10-26T09:32:04.625865731Z",
"provider": "osv",
"upstream": [
"CVE-2026-56154",
"CVE-2026-63292",
"CVE-2026-63686",
"CVE-2026-73636",
"CVE-2026-73637"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1791450651.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-56154",
"https://nvd.nist.gov/vuln/detail/CVE-2026-63292",
"https://nvd.nist.gov/vuln/detail/CVE-2026-63686",
"https://nvd.nist.gov/vuln/detail/CVE-2026-73636",
"https://nvd.nist.gov/vuln/detail/CVE-2026-73637"
]
},
"related_cves": [
{
"value": "CVE-2026-56154",
"evidence": "/upstream"
},
{
"value": "CVE-2026-63292",
"evidence": "/upstream"
},
{
"value": "CVE-2026-63686",
"evidence": "/upstream"
},
{
"value": "CVE-2026-73636",
"evidence": "/upstream"
},
{
"value": "CVE-2026-73637",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449627,
"published_at": "2026-10-08T09:11:08+00:00"
}