CVE-2026-34839
Glances is an open-source system cross-platform monitoring tool.
Published Apr 21, 2026 · corrected/updated Jun 17, 2026 · nicolargo glances · evidence confidence medium
Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API ( ) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy ( ). 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 ( ) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-34839 is a high public vulnerability record for nicolargo glances. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether nicolargo glances is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: nicolargo/glances. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 7.7. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-200, CWE-306, CWE-942. Sources contributing to this record: cve_org, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Apr 21, 2026 · NIST NVD
Detected
Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API ( ) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy ( ). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to
Jun 17, 2026 · NIST NVD
Updated
Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API ( ) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy ( ). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to
Affected
- cpe nicolargo/glancesversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-34839
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-34839
Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API ( ) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Cont
nvd.nist.gov