requests-hardened is Vulnerable to Server-Side Request Forgery
The SSRF protection in requests-hardened prior to version 1.2.1 fails to block IP addresses within the RFC 6598 Shared Address Space (100.64.0.0/10). An attacker who can supply arbitrary URLs to requests-hardened could exploit this gap to access internal services hosted within 100.64.0.0/10. This is for example relevant in environments such as AWS EKS where 100.64.0.0/10 is commonly used as the default pod CIDR.
The impact is environment-dependent, deployments that utilize the affected CIDR range for internal networking are exposed to SSRF bypass, while others may not be affected.
The issue is resolved in version 1.2.1 by extending the IP filtering logic to explicitly block the RFC 6598 range in addition to standard private addresses, as well as blocking all other reserved addresses (such as multicast) to prevent the re-occurrence of similar issues.
Version 1.2.1 is now blocking the following CIDRs:
192.88.99.0/24- 6to4 relay anycast100.64.0.0/10- CG-NAT5f00::/16- IPv6 Segment Routing64:ff9b::/96- used for IPv6 & IPv4 translation (NAT64)2001:20::/28- ORCHIDv2 (overlay identifiers)224.0.0.0/4- multicastff00::/8- multicast
Resources
- https://github.com/python/cpython/issues/119812
- https://github.com/saleor/requests-hardened/commit/b7403f88d3b3689e57435b75b51691a160aaeef5 - the fix itself
- https://github.com/saleor/requests-hardened/commit/a266b3958bb142bca515b3c230fdea19fbda327c - follow up, adding additional support for outdated Python versions (
3.11.9and3.10.11instead of only3.11.15and3.10.20) - https://github.com/saleor/requests-hardened/releases/tag/v1.2.1
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | requests-hardened | < 1.2.1 | 1.2.1 |
Referencias
- https://github.com/saleor/requests-hardened/security/advisories/GHSA-vh75-fwv3-pqrh
- https://nvd.nist.gov/vuln/detail/CVE-2026-42175
- https://github.com/saleor/requests-hardened/commit/a266b3958bb142bca515b3c230fdea19fbda327c
- https://github.com/saleor/requests-hardened/commit/b7403f88d3b3689e57435b75b51691a160aaeef5
- https://github.com/saleor/requests-hardened
- https://github.com/saleor/requests-hardened/releases/tag/v1.2.1
- https://pypi.org/project/requests-hardened
- https://github.com/advisories/GHSA-vh75-fwv3-pqrh
- Vector CVSS
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N- Debilidad (CWE)
CWE-918- Plataforma
- Python (PyPI)
- Paquete
requests-hardened- Publicada
- 05.05.2026
- Actualizado
- 11.10.2026 14:18
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-3050 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-vh75-fwv3-pqrh - CC BY 4.0
Historial de vulnerabilidades: requests-hardened
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