High
tmate-ssh-server — security advisory
Insecure creation of temporary directories in tmate-ssh-server 2.3.0 allows a local attacker to compromise the integrity of session handling.
- Products
- tmate-ssh-server
- Affected versions
- 2.3.0-49-g97d20249-1, 2.3.0-68-gd7334ee4-1, 2.3.0-68-gd7334ee4-1build1, 2.3.0-68-gd7334ee4-2, 2.3.0-68-gd7334ee4-2build1
- Fixed versions
- Not specified
- CVEs
- CVE-2021-44513
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:35 UTC · Revision 1
Source evidence
Insecure creation of temporary directories in tmate-ssh-server 2.3.0 allows a local attacker to compromise the integrity of session handling.
osv:UBUNTU-CVE-2021-44513
tmate-ssh-server
Fixed versions: Not specified
tmate-ssh-server
Fixed versions: Not specified
tmate-ssh-server
Fixed versions: Not specified
tmate-ssh-server
Fixed versions: Not specified
tmate-ssh-server
Fixed versions: Not specified
Complete source record
{
"id": "3d6eac36e31b88b5ee79baacb1890954ae40f688802763525e38757b83715e1b",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-44513",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2021-44513",
"summary": "Insecure creation of temporary directories in tmate-ssh-server 2.3.0 allows a local attacker to compromise the integrity of session handling.",
"evidence": "osv:UBUNTU-CVE-2021-44513",
"products": [
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},
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{
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{
"name": {
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"affected_versions": [
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"evidence": "/affected/1/versions"
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{
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"severity": "high",
"structured": {
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"aliases": [
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"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
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],
"affected": [
{
"ranges": [
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"events": [
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"introduced": "0"
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"package": {
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"purl": "pkg:deb/ubuntu/tmate-ssh-server?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"2.3.0-49-g97d20249-1"
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"database_specific": {
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"ecosystem_specific": {
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"ecosystem": "Ubuntu:24.04:LTS"
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"versions": [
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"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
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"binary_name": "tmate-ssh-server",
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}
},
{
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"package": {
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"purl": "pkg:deb/ubuntu/tmate-ssh-server?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
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},
"ecosystem_specific": {
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"package": {
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"purl": "pkg:deb/ubuntu/tmate-ssh-server?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"2.3.0-68-gd7334ee4-2",
"2.3.0-68-gd7334ee4-2build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44513.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tmate-ssh-server",
"binary_version": "2.3.0-68-gd7334ee4-2build1"
}
]
}
}
],
"modified": "2026-10-17T12:55:47.808223433Z",
"provider": "osv",
"upstream": [
"CVE-2021-44513"
],
"references": [
"https://ubuntu.com/security/CVE-2021-44513",
"https://www.openwall.com/lists/oss-security/2021/12/06/2",
"https://bugzilla.suse.com/show_bug.cgi?id=1189388",
"https://github.com/tmate-io/tmate-ssh-server/commit/1c020d1f5ca462f5b150b46a027aaa1bbe3c9596",
"https://www.cve.org/CVERecord?id=CVE-2021-44513"
]
},
"related_cves": [
{
"value": "CVE-2021-44513",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354101,
"published_at": "2021-12-07T03:15:00+00:00"
}