UnratedFix available
nginx: Fix of 6 CVEs
Type: advisorySources: OSV
- CVE-2025-53859: fix buffer over-read in the SMTP authentication path that could disclose worker process memory to the authentication server - CVE-2026-28753: validate host names resolved from the client address to prevent header injection into auth_http and XCLIENT requests - CVE-2026-40701: fix use-after-free by cancelling a pending OCSP responder resolve when the client connection is closed - CVE-2026-42934: fix buffer over-read in the charset filter when a UTF-8 sequence is split across several buffers - CVE-2026-48142: fix remaining buffer over-read in the charset filter on invalid UTF-8 sequences - CVE-2026-42946: reset the parsing state and restore the buffer position after an unrecognized upstream status line in the scgi and uwsgi modules
- Products
- nginx, nginx-all-modules, nginx-core, nginx-filesystem, nginx-mod-devel, nginx-mod-http-image-filter, nginx-mod-http-perl, nginx-mod-http-xslt-filter, nginx-mod-mail, nginx-mod-stream
- Affected versions
- Not specified
- Fixed versions
- 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
- CVEs
- CVE-2025-53859, CVE-2026-28753, CVE-2026-40701, CVE-2026-42934, CVE-2026-42946, CVE-2026-48142
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:46 UTC · Revision 1
Source evidence
- CVE-2025-53859: fix buffer over-read in the SMTP authentication path that could disclose worker process memory to the authentication server - CVE-2026-28753: validate host names resolved from the client address to prevent header injection into auth_http and XCLIENT requests - CVE-2026-40701: fix use-after-free by cancelling a pending OCSP responder resolve when the client connection is closed - CVE-2026-42934: fix buffer over-read in the charset filter when a UTF-8 sequence is split across several buffers - CVE-2026-48142: fix remaining buffer over-read in the charset filter on invalid UTF-8 sequences - CVE-2026-42946: reset the parsing state and restore the buffer position after an unrecognized upstream status line in the scgi and uwsgi modules
osv:CLSA-2026-1785509707
nginx
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
nginx-all-modules
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
nginx-core
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
nginx-filesystem
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
nginx-mod-devel
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
nginx-mod-http-image-filter
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
nginx-mod-http-perl
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
nginx-mod-http-xslt-filter
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
nginx-mod-mail
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
nginx-mod-stream
Fixed versions: 2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9
Complete source record
{
"id": "dc94a330c985a1761295e2495afcbd2632684c2bec489eb86b66cb613241fc29",
"url": "https://osv.dev/vulnerability/CLSA-2026-1785509707",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "nginx: Fix of 6 CVEs",
"summary": "- CVE-2025-53859: fix buffer over-read in the SMTP authentication path that could disclose worker process memory to the authentication server - CVE-2026-28753: validate host names resolved from the client address to prevent header injection into auth_http and XCLIENT requests - CVE-2026-40701: fix use-after-free by cancelling a pending OCSP responder resolve when the client connection is closed - CVE-2026-42934: fix buffer over-read in the charset filter when a UTF-8 sequence is split across several buffers - CVE-2026-48142: fix remaining buffer over-read in the charset filter on invalid UTF-8 sequences - CVE-2026-42946: reset the parsing state and restore the buffer position after an unrecognized upstream status line in the scgi and uwsgi modules",
"evidence": "osv:CLSA-2026-1785509707",
"products": [
{
"name": {
"value": "nginx",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-all-modules",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-core",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-filesystem",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-mod-devel",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-mod-http-image-filter",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-mod-http-perl",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-mod-http-xslt-filter",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-mod-mail",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-mod-stream",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1785509707",
"aliases": [
"CLSA-2026-1785509707"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9"
}
]
}
],
"package": {
"name": "nginx",
"purl": "pkg:rpm/tuxcare/nginx?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9"
}
]
}
],
"package": {
"name": "nginx-all-modules",
"purl": "pkg:rpm/tuxcare/nginx-all-modules?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9"
}
]
}
],
"package": {
"name": "nginx-core",
"purl": "pkg:rpm/tuxcare/nginx-core?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9"
}
]
}
],
"package": {
"name": "nginx-filesystem",
"purl": "pkg:rpm/tuxcare/nginx-filesystem?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9"
}
]
}
],
"package": {
"name": "nginx-mod-devel",
"purl": "pkg:rpm/tuxcare/nginx-mod-devel?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9"
}
]
}
],
"package": {
"name": "nginx-mod-http-image-filter",
"purl": "pkg:rpm/tuxcare/nginx-mod-http-image-filter?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9"
}
]
}
],
"package": {
"name": "nginx-mod-http-perl",
"purl": "pkg:rpm/tuxcare/nginx-mod-http-perl?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
},
{
"ranges": [
{
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"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "nginx-mod-http-xslt-filter",
"purl": "pkg:rpm/tuxcare/nginx-mod-http-xslt-filter?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
},
{
"ranges": [
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}
]
}
],
"package": {
"name": "nginx-mod-mail",
"purl": "pkg:rpm/tuxcare/nginx-mod-mail?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.20.1-22.el9_6.3.alma.2.tuxcare.els9"
}
]
}
],
"package": {
"name": "nginx-mod-stream",
"purl": "pkg:rpm/tuxcare/nginx-mod-stream?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1785509707.json"
}
}
],
"modified": "2026-10-26T09:43:18.215783126Z",
"provider": "osv",
"upstream": [
"CVE-2025-53859",
"CVE-2026-28753",
"CVE-2026-40701",
"CVE-2026-42934",
"CVE-2026-42946",
"CVE-2026-48142"
],
"references": [
"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1785509707.html",
"https://nvd.nist.gov/vuln/detail/CVE-2025-53859",
"https://nvd.nist.gov/vuln/detail/CVE-2026-28753",
"https://nvd.nist.gov/vuln/detail/CVE-2026-40701",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42934",
"https://nvd.nist.gov/vuln/detail/CVE-2026-42946",
"https://nvd.nist.gov/vuln/detail/CVE-2026-48142"
]
},
"related_cves": [
{
"value": "CVE-2025-53859",
"evidence": "/upstream"
},
{
"value": "CVE-2026-28753",
"evidence": "/upstream"
},
{
"value": "CVE-2026-40701",
"evidence": "/upstream"
},
{
"value": "CVE-2026-42934",
"evidence": "/upstream"
},
{
"value": "CVE-2026-42946",
"evidence": "/upstream"
},
{
"value": "CVE-2026-48142",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449818,
"published_at": "2026-07-31T15:01:40+00:00"
}