Vulnerability · Published Jul 29, 2026 · Assigned by GitHub_M

CVE-2026-67435linuxfabrik-lib: fetch() forwards credential headers across a cross-origin redirect

Medium 6.0

In plain English

A medium-severity information exposure in monitoring-plugins from Linuxfabrik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.0Medium

Exploit odds (30 days)0.5%top 57.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

linuxfabrik-lib provides Python modules for database access, caching, shell execution, and API integrations. Prior to version 6.0.0, lib.url.fetch() followed cross-origin redirects while forwarding caller-supplied credential headers other than Authorization and Cookie, allowing a malicious redirect-capable server to receive headers such as X-Auth-Token from authenticated monitoring requests. This issue is fixed in version 6.0.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	linuxfabrik-lib	6.0.0	GHSA-4jc5-g844-4x33
PyPI	linuxfabrik-lib	6.0.0	PYSEC-2026-3578

Affected products (as reported)

Vendor	Product	Versions
Linuxfabrik	monitoring-plugins	< 6.0.0

Weakness: CWE-200, CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-4jc5-g844-4x33 x_refsource_CONFIRM
https://github.com/Linuxfabrik/lib/commit/6573ff9347e541200305d278d2663d2e54e052ff x_refsource_MISC
https://github.com/Linuxfabrik/lib/releases/tag/v6.0.0 x_refsource_MISC