Medium severity · published Jul 29, 2026
CVE-2026-67435
linuxfabrik-lib: fetch() forwards credential headers across a cross-origin redirect
6.0
CVSS
0.5%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
monitoring-plugins · Linuxfabrik
< 6.0.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-67435
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-67435
github.com
https://github.com/Linuxfabrik/lib/commit/6573ff9347e541200305d278d2663d2e54e052ff
github.com
https://github.com/Linuxfabrik/lib/releases/tag/v6.0.0
github.com
https://github.com/Linuxfabrik/monitoring-plugins/security/advisories/GHSA-4jc5-g844-4x33
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