UnratedFix available
Fix CVE(s): CVE-2026-6949
Type: advisorySources: OSV
* SECURITY UPDATE: out-of-bounds write in the internal DNS server via a TSIG-signed packet using DNS name compression - debian/patches/CVE-2026-6949.patch: record the start offset of each dns_res_rec while pulling it and use the last additional record's offset to truncate the buffer for TSIG verification, instead of subtracting a re-pushed TSIG record length that can exceed the packet and underflow packet_len into a huge memcpy() size - CVE-2026-6949
- Products
- ctdb, libnss-winbind, libpam-winbind, libsmbclient, libsmbclient-dev, libwbclient-dev, libwbclient0, python-samba, registry-tools, samba, samba-common, samba-common-bin, samba-dev, samba-dsdb-modules, samba-libs, samba-testsuite, samba-vfs-modules, smbclient, winbind
- Affected versions
- Not specified
- Fixed versions
- 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
- CVEs
- CVE-2026-6949
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:22 UTC · Revision 1
Source evidence
* SECURITY UPDATE: out-of-bounds write in the internal DNS server via a TSIG-signed packet using DNS name compression - debian/patches/CVE-2026-6949.patch: record the start offset of each dns_res_rec while pulling it and use the last additional record's offset to truncate the buffer for TSIG verification, instead of subtracting a re-pushed TSIG record length that can exceed the packet and underflow packet_len into a huge memcpy() size - CVE-2026-6949
osv:CLSA-2026-1786477676
ctdb
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
libnss-winbind
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
libpam-winbind
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
libsmbclient
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
libsmbclient-dev
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
libwbclient-dev
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
libwbclient0
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
python-samba
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
registry-tools
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
samba
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
samba-common
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
samba-common-bin
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
samba-dev
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
samba-dsdb-modules
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
samba-libs
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
samba-testsuite
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
samba-vfs-modules
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
smbclient
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
winbind
Fixed versions: 2:4.9.5+dfsg-5+deb10u5+tuxcare.els9
Complete source record
{
"id": "f19c69943d4e5ffd66a01b5c2dca2d666eea070d2c4aa5b44eba29e4b9ae3c23",
"url": "https://osv.dev/vulnerability/CLSA-2026-1786477676",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-6949",
"summary": "* SECURITY UPDATE: out-of-bounds write in the internal DNS server via a TSIG-signed packet using DNS name compression - debian/patches/CVE-2026-6949.patch: record the start offset of each dns_res_rec while pulling it and use the last additional record's offset to truncate the buffer for TSIG verification, instead of subtracting a re-pushed TSIG record length that can exceed the packet and underflow packet_len into a huge memcpy() size - CVE-2026-6949",
"evidence": "osv:CLSA-2026-1786477676",
"products": [
{
"name": {
"value": "ctdb",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnss-winbind",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libpam-winbind",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libsmbclient",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libsmbclient-dev",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libwbclient-dev",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libwbclient0",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-samba",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "registry-tools",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-common",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-common-bin",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-dev",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-dsdb-modules",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-libs",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-testsuite",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/15/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "samba-vfs-modules",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/16/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "smbclient",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "winbind",
"evidence": "/affected/18/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9",
"evidence": "/affected/18/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1786477676",
"aliases": [
"CLSA-2026-1786477676"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "ctdb",
"purl": "pkg:deb/tuxcare/ctdb?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "libnss-winbind",
"purl": "pkg:deb/tuxcare/libnss-winbind?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "libpam-winbind",
"purl": "pkg:deb/tuxcare/libpam-winbind?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "libsmbclient",
"purl": "pkg:deb/tuxcare/libsmbclient?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "libsmbclient-dev",
"purl": "pkg:deb/tuxcare/libsmbclient-dev?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "libwbclient-dev",
"purl": "pkg:deb/tuxcare/libwbclient-dev?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "libwbclient0",
"purl": "pkg:deb/tuxcare/libwbclient0?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "python-samba",
"purl": "pkg:deb/tuxcare/python-samba?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "registry-tools",
"purl": "pkg:deb/tuxcare/registry-tools?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "samba",
"purl": "pkg:deb/tuxcare/samba?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "samba-common",
"purl": "pkg:deb/tuxcare/samba-common?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "samba-common-bin",
"purl": "pkg:deb/tuxcare/samba-common-bin?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "samba-dev",
"purl": "pkg:deb/tuxcare/samba-dev?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "samba-dsdb-modules",
"purl": "pkg:deb/tuxcare/samba-dsdb-modules?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "samba-libs",
"purl": "pkg:deb/tuxcare/samba-libs?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "samba-testsuite",
"purl": "pkg:deb/tuxcare/samba-testsuite?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "samba-vfs-modules",
"purl": "pkg:deb/tuxcare/samba-vfs-modules?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "smbclient",
"purl": "pkg:deb/tuxcare/smbclient?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:4.9.5+dfsg-5+deb10u5+tuxcare.els9"
}
]
}
],
"package": {
"name": "winbind",
"purl": "pkg:deb/tuxcare/winbind?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1786477676.json"
}
}
],
"modified": "2026-10-26T09:31:52.828098860Z",
"provider": "osv",
"upstream": [
"CVE-2026-6949"
],
"references": [
"https://errata.tuxcare.com/els_os/debian10els/CLSA-2026-1786477676.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-6949"
]
},
"related_cves": [
{
"value": "CVE-2026-6949",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448804,
"published_at": "2026-08-11T19:48:07+00:00"
}