MediumFix available
glances — security advisory
Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Control-Allow-Origin: *`). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (`/api/4/*`) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.
- Products
- glances
- Affected versions
- 3.3.1.1+dfsg-1, 3.4.0.3+dfsg-1, 4.0.5+dfsg-1, 4.1.2.1+dfsg-1, 4.2.1+dfsg-1, 4.3.0.8+dfsg-1, 4.3.1+dfsg-1, 4.3.3+dfsg-1, 4.5.1+dfsg-1, 4.5.2+dfsg-1, 4.5.3.2+dfsg-1, 4.5.4+dfsg-1, 4.5.5+dfsg-1, 4.5.6+dfsg-1, 4.5.7+dfsg-1, 4.5.8+dfsg-1
- Fixed versions
- 4.5.4+dfsg-1
- CVEs
- CVE-2026-34839
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:52 UTC · Revision 2
Source evidence
Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Control-Allow-Origin: *`). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (`/api/4/*`) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.
osv:DEBIAN-CVE-2026-34839
glances
Fixed versions: Not specified
glances
Fixed versions: Not specified
glances
Fixed versions: 4.5.4+dfsg-1
Complete source record
{
"id": "569e74093463b07bf3e90386571a6f13fd2aafc4fea97a4193ad6879d4108643",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-34839",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-34839",
"summary": "Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Control-Allow-Origin: *`). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (`/api/4/*`) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.",
"evidence": "osv:DEBIAN-CVE-2026-34839",
"products": [
{
"name": {
"value": "glances",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.3.1.1+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.4.0.3+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.0.5+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.2.1+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.2.1+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.0.8+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.1+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.3+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.1+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.2+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.3.2+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.4+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.5+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.6+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.7+dfsg-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.5.8+dfsg-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "glances",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.3.1+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.3.3+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.5.1+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.5.2+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.5.3.2+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.5.4+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.5.5+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.5.6+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.5.7+dfsg-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.5.8+dfsg-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "glances",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.5.4+dfsg-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "4.3.1+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.3.3+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.5.1+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.5.2+dfsg-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.5.3.2+dfsg-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-34839",
"aliases": [
"DEBIAN-CVE-2026-34839"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "glances",
"purl": "pkg:deb/debian/glances?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.3.1.1+dfsg-1",
"3.4.0.3+dfsg-1",
"4.0.5+dfsg-1",
"4.1.2.1+dfsg-1",
"4.2.1+dfsg-1",
"4.3.0.8+dfsg-1",
"4.3.1+dfsg-1",
"4.3.3+dfsg-1",
"4.5.1+dfsg-1",
"4.5.2+dfsg-1",
"4.5.3.2+dfsg-1",
"4.5.4+dfsg-1",
"4.5.5+dfsg-1",
"4.5.6+dfsg-1",
"4.5.7+dfsg-1",
"4.5.8+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34839.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "glances",
"purl": "pkg:deb/debian/glances?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.3.1+dfsg-1",
"4.3.3+dfsg-1",
"4.5.1+dfsg-1",
"4.5.2+dfsg-1",
"4.5.3.2+dfsg-1",
"4.5.4+dfsg-1",
"4.5.5+dfsg-1",
"4.5.6+dfsg-1",
"4.5.7+dfsg-1",
"4.5.8+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34839.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.5.4+dfsg-1"
}
]
}
],
"package": {
"name": "glances",
"purl": "pkg:deb/debian/glances?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.3.1+dfsg-1",
"4.3.3+dfsg-1",
"4.5.1+dfsg-1",
"4.5.2+dfsg-1",
"4.5.3.2+dfsg-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34839.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T10:01:05.573154049Z",
"provider": "osv",
"upstream": [
"CVE-2026-34839"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-34839"
]
},
"related_cves": [
{
"value": "CVE-2026-34839",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 461403,
"published_at": "2026-04-21T00:16:27.91+00:00"
}