What’s Vulnerable › Vulnerabilities

CVE-2026-33752: Redirect-based SSRF leading to internal network access in curl_cffi (with TLS impersonation bypass)

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-06 · updated 2026-10-26
• Weakness: CWE-918

Description

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.

Affected products

• lexiforest curl_cffi: before 0.15.0; 0.15.0-beta1, 0.15.0-beta2, 0.15.0-beta3, 0.15.0-beta4 — fixed in 0.15.0

How to fix

Upgrade to a fixed version: lexiforest curl_cffi 0.15.0. Check the vendor advisory for mitigations.

References

• https://github.com/lexiforest/curl_cffi/security/advisories/GHSA-qw2m-4pqf-rmpp
• https://github.com/lexiforest/curl_cffi/security/advisories/GHSA-qw2m-4pqf-rmpp

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