What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.0 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-29 · updated 2026-10-24
• Weakness: CWE-200

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 products

• Linuxfabrik monitoring-plugins: before 6.0.0

References

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

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