CVE-2026-70667 Lemur: SSRF protection in certificate revocation checking bypassable via HTTP redirects and DNS rebinding (incomplete fix for CVE-2026-55162)

Lemur manages TLS certificate creation. Prior to 1.9.3, validaterevocationurl in lemur/certificates/verify.py checked the original CRL or OCSP URL but the later request could reach a different destination. The CRL requests.get call followed HTTP redirects without validating each Location target, ...

CVE-2026-70667 Lemur: SSRF protection in certificate revocation checking bypassable via HTTP redirects and DNS rebinding (incomplete fix for CVE-2026-55162)

Lemur manages TLS certificate creation. Prior to 1.9.3, validaterevocationurl in lemur/certificates/verify.py checked the original CRL or OCSP URL but the later request could reach a different destination. The CRL requests.get call followed HTTP redirects without validating each Location target, ...

CVE-2026-70667

Netflix Lemur prior to 1.9.3 contains a bypass of its SSRF mitigation in _validate_revocation_url (lemur/certificates/verify.py). Two vectors exist: (1) the CRL requests.get call follows HTTP redirects without re-validating each Location target, allowing an attacker-controlled public URL to redir...