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

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Summary

CVECVE-2026-33752
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-06 16:16:34 UTC
Updated2026-04-09 18:10:21 UTC
Descriptioncurl_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.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS: 0.000100000 probability, percentile 0.011770000 (date 2026-04-07)

Problem Types: CWE-918 | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Lexiforest Curl Cffi All All All All
Application Lexiforest Curl Cffi 0.15.0 beta1 All All
Application Lexiforest Curl Cffi 0.15.0 beta2 All All
Application Lexiforest Curl Cffi 0.15.0 beta3 All All
Application Lexiforest Curl Cffi 0.15.0 beta4 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Lexiforest Curl Cffi affected < 0.15.0 Not specified

References

ReferenceSourceLinkTags
github.com/lexiforest/curl_cffi/security/advisories/GHSA-qw2m-4pqf-rmpp 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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