CVE catalog

CVE-2026-34839

Glances is an open-source system cross-platform…

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.

Severity: High · CVSS 7.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published: Apr 20, 2026, 11:09:02 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.41% · Oct 27, 2026

Projects and upstream resources

[glances][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "glances",
      "status": "fixed",
      "release": "sid",
      "version": "4.5.8+dfsg-1"
    },
    {
      "name": "glances",
      "status": "fixed",
      "release": "forky",
      "version": "4.5.8+dfsg-1"
    },
    {
      "name": "glances",
      "status": "vulnerable",
      "release": "trixie",
      "version": "4.3.1+dfsg-1"
    },
    {
      "name": "glances",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "3.3.1.1+dfsg-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1134645,
      "name": "glances",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "4.5.4+dfsg-1"
    },
    {
      "bug": 1134645,
      "name": "glances",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "4.5.4+dfsg-1"
    },
    {
      "bug": 1134645,
      "name": "glances",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1134645,
      "name": "glances",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "glances",
      "ecosystem": "cpe",
      "fixed_version": "not yet fixed"
    },
    {
      "name": "glances",
      "ecosystem": "cpe",
      "fixed_version": "4.5.4"
    },
    {
      "name": "glances",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.5.4"
            }
          ]
        }
      ],
      "ecosystem": "PyPI",
      "fixed_version": "4.5.4",
      "provider_record_id": "PYSEC-2026-2175"
    },
    {
      "name": "python-Glances",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.5.4-1.1"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.5.4-1.1",
      "provider_record_id": "OPENSUSE-SU-2026:10602-1"
    },
    {
      "name": "glances",
      "ranges": [
        {
          "fixed": "4.5.4",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "4.5.4",
      "provider_record_id": "NVD-CVE-2026-34839"
    }
  ]
}

[Debian bug #1134645]

Publisher notes

[trixie] glances: Minor issue [bookworm] glances: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[glances]Unknown
Details (2)
- 3.3.1.1+dfsg-1 · all · bookworm
  Affected
  nvd · glances · debian · bookworm; nvd · glances · debian · 12
- 3.3.1.1+dfsg-1 · all · bookworm
  Affected
  nvd · glances · debian · bookworm; nvd · glances · debian · 12
[glances-doc]Unknown
Source package: [glances]
Details (2)
- 3.3.1.1+dfsg-1 · all · bookworm
  Affected
  nvd · glances · debian · bookworm; nvd · glances · debian · 12
- 3.3.1.1+dfsg-1 · all · bookworm
  Affected
  nvd · glances · debian · bookworm; nvd · glances · debian · 12

[Debian 13 (Trixie)]

[glances]Unknown
Details (2)
- 4.3.1+dfsg-1 · all · trixie
  Affected
  nvd · glances · debian · 13
- 4.3.1+dfsg-1 · all · trixie
  Affected
  nvd · glances · debian · 13
[glances-doc]Unknown
Source package: [glances]
Details (2)
- 4.3.1+dfsg-1 · all · trixie
  Affected
  nvd · glances · debian · 13
- 4.3.1+dfsg-1 · all · trixie
  Affected
  nvd · glances · debian · 13

[openSUSE Tumbleweed]

[glances-common]Unknown
Source package: [python-Glances]
Details (1)
- 4.5.5-2.2 · noarch · tumbleweed
  Unknown · Fixed: 4.5.4-1.1
  Version impact unknown
  nvd · python-Glances · opensuse · tumbleweed
[python313-Glances]Unknown
Source package: [python-Glances]
Details (1)
- 4.5.5-2.2 · noarch · tumbleweed
  Unknown · Fixed: 4.5.4-1.1
  Version impact unknown
  nvd · python-Glances · opensuse · tumbleweed
[python314-Glances]Unknown
Source package: [python-Glances]
Details (1)
- 4.5.5-2.2 · noarch · tumbleweed
  Unknown · Fixed: 4.5.4-1.1
  Version impact unknown
  nvd · python-Glances · opensuse · tumbleweed

Observed: Oct 27, 2026, 10:28:14 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]