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-19436312
- published31 Aug 2026
- disclosed18 Aug 2026
- creditabhinav9-coder
Introduced: 18 Aug 2026
NewCVE-2026-70667 (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) via HTTP redirect following and DNS rebinding in the _validate_revocation_url function. An authenticated attacker can supply a revocation URL (CRL or OCSP) that passes the initial private-IP check but then redirects to an internal address (redirect bypass), or that resolves to a public IP at validation time but is re-resolved to an internal IP at fetch time (DNS rebinding / TOCTOU). Both paths allow the attacker to cause the server to make HTTP requests to arbitrary internal network destinations.