Fix CVE(s): CVE-2026-59999, CVE-2026-60000
* SECURITY UPDATE: DisableForwarding did not override PermitTunnel - debian/patches/CVE-2026-59999.patch: add options.disable_forwarding to the PermitTunnel gate in server_request_tun() in serverloop.c so that DisableForwarding=yes rejects tunnel-device forwarding as documented. - CVE-2026-59999 * SECURITY UPDATE: GSSAPI userauth pre-auth resource DoS / MaxAuthTries bypass - debian/patches/CVE-2026-60000.patch: discard the client error token in input_gssapi_errtok() instead of feeding it to ssh_gssapi_accept_ctx(), and record the failed attempt via userauth_finish() so GSSAPI auth is subject to MaxAuthTries, in auth2-gss.c. - CVE-2026-60000
- 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.els4
- CVEs
- CVE-2026-59999, CVE-2026-60000
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:44 UTC · Revision 1
Source evidence
Fix CVE(s): CVE-2026-59999, CVE-2026-60000
core-osv · Original sourcePublished 22 Jul 2026, 13:06 UTC
* SECURITY UPDATE: DisableForwarding did not override PermitTunnel - debian/patches/CVE-2026-59999.patch: add options.disable_forwarding to the PermitTunnel gate in server_request_tun() in serverloop.c so that DisableForwarding=yes rejects tunnel-device forwarding as documented. - CVE-2026-59999 * SECURITY UPDATE: GSSAPI userauth pre-auth resource DoS / MaxAuthTries bypass - debian/patches/CVE-2026-60000.patch: discard the client error token in input_gssapi_errtok() instead of feeding it to ssh_gssapi_accept_ctx(), and record the failed attempt via userauth_finish() so GSSAPI auth is subject to MaxAuthTries, in auth2-gss.c. - CVE-2026-60000
osv:CLSA-2026-1784725535
openssh-client
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els4
openssh-server
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els4
openssh-sftp-server
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els4
openssh-tests
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els4
ssh
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els4
ssh-askpass-gnome
Fixed versions: 1:8.2p1-4ubuntu0.13+tuxcare.els4
Complete source record
{
"id": "1b0f91a96573df09363d8dc0d34d007abab10b53fc3238e4188f9b9c9030fa78",
"url": "https://osv.dev/vulnerability/CLSA-2026-1784725535",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-59999, CVE-2026-60000",
"summary": "* SECURITY UPDATE: DisableForwarding did not override PermitTunnel - debian/patches/CVE-2026-59999.patch: add options.disable_forwarding to the PermitTunnel gate in server_request_tun() in serverloop.c so that DisableForwarding=yes rejects tunnel-device forwarding as documented. - CVE-2026-59999 * SECURITY UPDATE: GSSAPI userauth pre-auth resource DoS / MaxAuthTries bypass - debian/patches/CVE-2026-60000.patch: discard the client error token in input_gssapi_errtok() instead of feeding it to ssh_gssapi_accept_ctx(), and record the failed attempt via userauth_finish() so GSSAPI auth is subject to MaxAuthTries, in auth2-gss.c. - CVE-2026-60000",
"evidence": "osv:CLSA-2026-1784725535",
"products": [
{
"name": {
"value": "openssh-client",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:8.2p1-4ubuntu0.13+tuxcare.els4",
"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.els4",
"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.els4",
"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.els4",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ssh",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:8.2p1-4ubuntu0.13+tuxcare.els4",
"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.els4",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1784725535",
"aliases": [
"CLSA-2026-1784725535"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els4"
}
]
}
],
"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-2026-1784725535.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els4"
}
]
}
],
"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-2026-1784725535.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els4"
}
]
}
],
"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-2026-1784725535.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els4"
}
]
}
],
"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-2026-1784725535.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els4"
}
]
}
],
"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-2026-1784725535.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:8.2p1-4ubuntu0.13+tuxcare.els4"
}
]
}
],
"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-2026-1784725535.json"
}
}
],
"modified": "2026-10-26T09:32:05.527867872Z",
"provider": "osv",
"upstream": [
"CVE-2026-59999",
"CVE-2026-60000"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1784725535.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-59999",
"https://nvd.nist.gov/vuln/detail/CVE-2026-60000"
]
},
"related_cves": [
{
"value": "CVE-2026-59999",
"evidence": "/upstream"
},
{
"value": "CVE-2026-60000",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449689,
"published_at": "2026-07-22T13:06:03+00:00"
}