CVE-2026-33752
Redirect-based SSRF leading to internal network access in curl_cffi (with TLS impersonation bypass)
- Published
- Apr 6, 2026
- Updated
- Apr 6, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 25, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:NLow · next 30 days
- Percentile
- 39.2%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
curl_cffi is the a Python binding for curl. Prior to 0.15.0, curl_cffi does not restrict requests to internal IP ranges, and follows redirects automatically via the underlying libcurl. Because of this, an attacker-controlled URL can redirect requests to internal services such as cloud metadata endpoints. In addition, curl_cffi’s TLS impersonation feature can make these requests appear as legitimate browser traffic, which may bypass certain network controls. This vulnerability is fixed in 0.15.0.
Sources
1Demonstrates a redirect-based SSRF vulnerability in curl_cffi allowing internal network access, with PoC code and analysis of TLS impersonation bypass.
Responsible use
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