Server-side Request Forgery (SSRF) Affecting lemur package, versions [,1.9.3)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-LEMUR-19436309
- published31 Aug 2026
- disclosed18 Aug 2026
- creditGeorge Chen
Introduced: 18 Aug 2026
NewCVE-2026-71303 (opens in a new tab)How to fix?
Upgrade lemur to version 1.9.3 or higher.
Overview
lemur is a Certificate management and orchestration service
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) in the acme_url option during the authority update. An attacker can cause the backend to make arbitrary HTTP requests to internal or external endpoints by supplying a crafted URL, potentially exposing sensitive internal resources or metadata services.
Note: This is only exploitable if a user has been granted membership in an ACME authority's role group and the default configuration does not enforce strict role permissions.