CVE-2026-34839

Glances before 4.5.6 has a vulnerability in as_dict_secure() in glances/config.py that checks only option names and exposes public_username and credentials embedded in public_api values through unauthenticated GET /api/4/config and GET /api/4/config/ip requests.

Glances is an open-source system cross-platform monitoring tool. Prior to 4.5.6, GlancesActions.run() in glances/actions.py ignores --disable-config-exec for on-alert action commands and invokes secure_popen() with shell operators enabled, allowing configured redirection, command chaining, or pipes to execute when an alert triggers. This issue is fixed in 4.5.6.

Glances is an open-source system cross-platform monitoring tool. From 4.5.2 until 4.5.6, _sanitize_mustache_dict() in glances/actions.py skips nested list and dictionary strings such as process cmdline values, allowing pipe characters to survive chevron.render() and be executed by secure_popen() through administrator-configured action templates. This issue is fixed in 4.5.6.

Glances before version 4.5.6 has a vulnerability in _sanitize_mustache_dict() in glances/actions.py that sanitizes individual Mustache values before chevron.render(), allowing adjacent unescaped Mustache variables to reconstruct shell operators that secure_popen() executes when attacker-controlled process or container fields are rendered by an administrator-configured action template. This issue is fixed in 4.5.6.

Glances is an open-source system cross-platform monitoring tool. Prior to 4.5.6, the cors_origins guard in glances/outputs/glances_restful_api.py uses exact list equality instead of wildcard membership, allowing a multi-origin list containing the wildcard to retain cors_credentials and expose authenticated REST API data to an untrusted website visited by a previously authenticated user. This issue is fixed in 4.5.6.

Glances is a system monitoring tool that, from versions 4.0.8 to 4.5.5, has a vulnerability in the secure_popen() function. This function interprets redirection, pipe, and command chaining operators without validation, allowing unauthorized actions on the system.

Glances is a system monitoring tool that prior to version 4.5.5 used pickle.load() to read a version-check cache file. The lack of integrity checks and format validation before deserialization allows an attacker with access to this file to plant a malicious pickle file, leading to arbitrary code execution.

Prior to version 4.5.4, Glances' Cassandra export module interpolates keyspace, table, and replication_factor configuration values directly into CQL statements without validation. A user with write access to glances.conf can redirect all monitoring data to an attacker-controlled Cassandra keyspace.

Glances (an open-source system monitoring tool) prior to version 4.5.4 contains a Server-Side Request Forgery (SSRF) vulnerability in the IP plugin due to improper validation of the public_api configuration parameter. The value of public_api is used directly in outbound HTTP requests without scheme restriction or hostname/IP validation. An attacker who can modify the Glances configuration can force requests to arbitrary internal or external endpoints, and when public_username and public_password are set, credentials are leaked in the Authorization: Basic header.

In Glances prior to 4.5.3, the XML-RPC server sends Access-Control-Allow-Origin: * on every HTTP response and does not validate the Content-Type header. An attacker-controlled webpage can issue a CORS simple request with a valid XML-RPC payload and read the full system monitoring dataset.