CVE-2026-33752

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

Published Apr 6, 2026 CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-qw2m-4pqf-rmpp curl_cffi: Redirect-based SSRF leads to internal network access in curl_cffi (with TLS impersonation bypass)
History
Type Values Removed Values Added
CPEs cpe:2.3:a:lexiforest:curl_cffi:*:*:*:*:*:python:*:*
cpe:2.3:a:lexiforest:curl_cffi:0.15.0:beta1:*:*:*:python:*:*
cpe:2.3:a:lexiforest:curl_cffi:0.15.0:beta2:*:*:*:python:*:*
cpe:2.3:a:lexiforest:curl_cffi:0.15.0:beta3:*:*:*:python:*:*
cpe:2.3:a:lexiforest:curl_cffi:0.15.0:beta4:*:*:*:python:*:*
Type Values Removed Values Added
First Time appeared Lexiforest
Lexiforest curl Cffi
Vendors & Products Lexiforest
Lexiforest curl Cffi
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Redirect-based SSRF leading to internal network access in curl_cffi (with TLS impersonation bypass)
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Apr 6, 2026, 3:40 PM
Reserved
Mar 23, 2026, 6:30 PM
Status
Analyzed
Published
Apr 6, 2026, 4:16 PM
Modified
Oct 26, 2026, 9:10 PM