Fix CVE(s): CVE-2026-106553, CVE-2026-106555, CVE-2026-106583, CVE-2026-106585
* SECURITY UPDATE: GSSAPI client state and credentials persisted across authentication attempts - debian/patches/CVE-2026-106553-CVE-2026-106555.patch: add ssh_gssapi_cleanup_global_client() and call it before each userauth request in auth2.c and before each pre-auth GSSAPI context setup in monitor.c, and add a userok flag to ssh_gssapi_client so that ssh_gssapi_storecreds() only stores delegated credentials after successful authorization, in gss-serv.c and ssh-gss.h - CVE-2026-106553 - CVE-2026-106555 * SECURITY UPDATE: Command injection via command-line username - debian/patches/CVE-2026-106583.patch: reject '$' and '\' anywhere in a command-line supplied user name in valid_ruser(), in ssh.c - CVE-2026-106583 * SECURITY UPDATE: Decompression bomb exceeding maximum packet size - debian/patches/CVE-2026-106585.patch: fail uncompress_buffer() once the decompressed output reaches PACKET_MAX_SIZE, in packet.c - CVE-2026-106585
- Products
- openssh-client, openssh-server, openssh-sftp-server, openssh-tests, ssh, ssh-askpass-gnome
- Affected versions
- Not specified
- Fixed versions
- 1:8.2p1-4ubuntu0.13+tuxcare.els6
- CVEs
- CVE-2026-106553, CVE-2026-106555, CVE-2026-106583, CVE-2026-106585
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:44 UTC · Revision 1
Source evidence
Fix CVE(s): CVE-2026-106553, CVE-2026-106555, CVE-2026-106583, CVE-2026-106585
core-osv · Original sourcePublished 19 Oct 2026, 09:10 UTC
* SECURITY UPDATE: GSSAPI client state and credentials persisted across authentication attempts - debian/patches/CVE-2026-106553-CVE-2026-106555.patch: add ssh_gssapi_cleanup_global_client() and call it before each userauth request in auth2.c and before each pre-auth GSSAPI context setup in monitor.c, and add a userok flag to ssh_gssapi_client so that ssh_gssapi_storecreds() only stores delegated credentials after successful authorization, in gss-serv.c and ssh-gss.h - CVE-2026-106553 - CVE-2026-106555 * SECURITY UPDATE: Command injection via command-line username - debian/patches/CVE-2026-106583.patch: reject '$' and '\' anywhere in a command-line supplied user name in valid_ruser(), in ssh.c - CVE-2026-106583 * SECURITY UPDATE: Decompression bomb exceeding maximum packet size - debian/patches/CVE-2026-106585.patch: fail uncompress_buffer() once the decompressed output reaches PACKET_MAX_SIZE, in packet.c - CVE-2026-106585
osv:CLSA-2026-1792399515
openssh-client
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els6
openssh-server
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els6
openssh-sftp-server
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els6
openssh-tests
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els6
ssh
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els6
ssh-askpass-gnome
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els6
Complete source record
{
"id": "4f2c04706a0503d816fe7c1c90b8601802110baf3657fcf116f249b31cf5a472",
"url": "https://osv.dev/vulnerability/CLSA-2026-1792399515",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-106553, CVE-2026-106555, CVE-2026-106583, CVE-2026-106585",
"summary": "* SECURITY UPDATE: GSSAPI client state and credentials persisted across authentication attempts - debian/patches/CVE-2026-106553-CVE-2026-106555.patch: add ssh_gssapi_cleanup_global_client() and call it before each userauth request in auth2.c and before each pre-auth GSSAPI context setup in monitor.c, and add a userok flag to ssh_gssapi_client so that ssh_gssapi_storecreds() only stores delegated credentials after successful authorization, in gss-serv.c and ssh-gss.h - CVE-2026-106553 - CVE-2026-106555 * SECURITY UPDATE: Command injection via command-line username - debian/patches/CVE-2026-106583.patch: reject '$' and '\\' anywhere in a command-line supplied user name in valid_ruser(), in ssh.c - CVE-2026-106583 * SECURITY UPDATE: Decompression bomb exceeding maximum packet size - debian/patches/CVE-2026-106585.patch: fail uncompress_buffer() once the decompressed output reaches PACKET_MAX_SIZE, in packet.c - CVE-2026-106585",
"evidence": "osv:CLSA-2026-1792399515",
"products": [
{
"name": {
"value": "openssh-client",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:8.2p1-4ubuntu0.13+tuxcare.els6",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openssh-server",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:8.2p1-4ubuntu0.13+tuxcare.els6",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openssh-sftp-server",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:8.2p1-4ubuntu0.13+tuxcare.els6",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "openssh-tests",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:8.2p1-4ubuntu0.13+tuxcare.els6",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ssh",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:8.2p1-4ubuntu0.13+tuxcare.els6",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ssh-askpass-gnome",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:8.2p1-4ubuntu0.13+tuxcare.els6",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1792399515",
"aliases": [
"CLSA-2026-1792399515"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els6"
}
]
}
],
"package": {
"name": "openssh-client",
"purl": "pkg:deb/tuxcare/openssh-client?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-2026-1792399515.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els6"
}
]
}
],
"package": {
"name": "openssh-server",
"purl": "pkg:deb/tuxcare/openssh-server?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-2026-1792399515.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els6"
}
]
}
],
"package": {
"name": "openssh-sftp-server",
"purl": "pkg:deb/tuxcare/openssh-sftp-server?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-2026-1792399515.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els6"
}
]
}
],
"package": {
"name": "openssh-tests",
"purl": "pkg:deb/tuxcare/openssh-tests?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-2026-1792399515.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els6"
}
]
}
],
"package": {
"name": "ssh",
"purl": "pkg:deb/tuxcare/ssh?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-2026-1792399515.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els6"
}
]
}
],
"package": {
"name": "ssh-askpass-gnome",
"purl": "pkg:deb/tuxcare/ssh-askpass-gnome?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-2026-1792399515.json"
}
}
],
"modified": "2026-10-26T09:32:05.632380904Z",
"provider": "osv",
"upstream": [
"CVE-2026-106553",
"CVE-2026-106555",
"CVE-2026-106583",
"CVE-2026-106585"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1792399515.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106553",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106555",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106583",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106585"
]
},
"related_cves": [
{
"value": "CVE-2026-106553",
"evidence": "/upstream"
},
{
"value": "CVE-2026-106555",
"evidence": "/upstream"
},
{
"value": "CVE-2026-106583",
"evidence": "/upstream"
},
{
"value": "CVE-2026-106585",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449710,
"published_at": "2026-10-19T09:10:22+00:00"
}