CVE-2026-34839: Glances is an open-source system cross-platform monitoring tool

Q: How do I fix CVE-2026-34839?

glances: upgrade to 4.5.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-34839 being exploited?

CVE-2026-34839 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34839 affect?

CVE-2026-34839 affects glances. Severity is medium (CVSS 6.5). 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 t

Q: How urgent is CVE-2026-34839?

Priority 36/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-34839 is a medium-severity flaw (CVSS 6.5) affecting glances. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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-orig

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-200, CWE-306, CWE-942
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: nicolargo

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 00:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

nicolargo glances UPGRADE

Affected: < 4.5.4

Fixed in: 4.5.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy glances || rpm -q glances || glances --version

2. UPGRADE to 4.5.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade glances

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade glances

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34839?

glances: upgrade to 4.5.4. Exact commands for each OS are on this page.

Is CVE-2026-34839 being exploited?

CVE-2026-34839 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34839 affect?

CVE-2026-34839 affects glances. Severity is medium (CVSS 6.5). 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 t

How urgent is CVE-2026-34839?

Priority 36/100. Public exploit reference

Related CVEs

CVE-2026-33641 HIGH 7.8 UPGRADE Glances is an open-source system cross-platform monitoring tool
CVE-2026-35587 HIGH 8.8 UPGRADE Glances is an open-source system cross-platform monitoring tool
CVE-2026-33533 MEDIUM 6.5 UPGRADE Glances is an open-source system cross-platform monitoring tool
CVE-2026-35588 MEDIUM 6.3 UPGRADE Glances is an open-source system cross-platform monitoring tool

References

← Back to latest CVEs