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Vulnerabilities

Vulnerability · CVE-2026-34839

Glances is an open-source system cross-platform monitoring tool.

Published Apr 21, 2026 · catalog updated Jun 17, 2026 · Glances is an open-source

Check if you run it

No confirmed exploitation is on record for CVE-2026-34839. EPSS is 0.47%. Act only if a listed version of Glances is an open-source is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Glances is an open-source).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.47%
Remediation
Advisory link
Affected products
cpe nicolargo/glances

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe nicolargo/glancesversion unspecified

How to fix CVE-2026-34839

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-34839. EPSS is 0.47%. Act only if a listed version of Glances is an open-source is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-200: Exposure of Sensitive Information; CWE-306: Missing Authentication for Critical Function; CWE-942: Permissive Cross-domain Policy with Untrusted Domains. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. 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

  2. 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

Sources

  • CVE.orgVulnerability recordCVE-2026-34839

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-34839

    30-day exploitation probability 0.5%

    first.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

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.