CVE-2026-33752 json
Redirect-based SSRF leading to internal network access in curl_cffi (with TLS impersonation bypass)
published 2026-04-03 7 mo ago modified 2026-10-26 13 d ago also GHSA-qw2m-4pqf-rmpp , PYSEC-2026-2431 , EUVD-2026-19293
- cvss
- 8.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 41%
- public exploits
- 0
- none known
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.
Patch / fix
- pypi curl-cffi 0.15.0
- lexiforest curl_cffi 0.15.0
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/lexiforest/curl_cffi/security/advisories/GHSA-qw2m-4pqf-rmpp referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
| OSV | 3.1 | 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
| GitHub | 3.1 | 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | curl-cffi | <0.15.0 |
0.15.0 |
Affected products
- lexiforest curl_cffi
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/lexiforest/curl_cffi/security/advisories/GHSA-qw2m-4pqf-rmpp
exploit, web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-33752
advisory
-
github.com
/lexiforest/curl_cffi
package
-
pypi.org
/project/curl-cffi
package
-
github.com
/advisories/GHSA-qw2m-4pqf-rmpp
advisory
Sources
- CVE List CVE-2026-33752
- GitHub Advisory GHSA-qw2m-4pqf-rmpp
- NVD CVE-2026-33752
- OSV PYSEC-2026-2431
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.