{"id":"DEBIAN-CVE-2026-34839","details":"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.","modified":"2026-09-14T17:03:30.931463543Z","published":"2026-04-21T00:16:27.910Z","upstream":["CVE-2026-34839"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-34839"}],"affected":[{"package":{"name":"glances","ecosystem":"Debian:12","purl":"pkg:deb/debian/glances?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34839.json"}},{"package":{"name":"glances","ecosystem":"Debian:13","purl":"pkg:deb/debian/glances?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34839.json"}},{"package":{"name":"glances","ecosystem":"Debian:14","purl":"pkg:deb/debian/glances?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.4+dfsg-1"}]}],"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"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34839.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"}]}