CVE-2026-50221
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk10th percentile — higher than 10% of all known CVEs
Summary
In OpenStack Swift before version 2.37.2, the proxy-server does not strip internal update headers (X-Container-Host, X-Container-Device, X-Delete-At-Host, X-Delete-At-Device) from client requests before forwarding them to object-servers. An authenticated user with write access can inject these headers to redirect container update requests to an attacker-controlled server, enabling server-side request forgery (SSRF).
Risk Assessment
The SSRF attack exposes internal cluster metadata including storage policy indexes, partition mappings, device names, and when encryption at rest is enabled, ciphertext and initialization vectors for the container-level encryption key. The attacker can also cause 'ghost listings' in arbitrary containers via the shard-range redirect mechanism.
Recommendation
Immediately upgrade OpenStack Swift to version 2.37.2 or later, which strips internal update headers from client requests. As a temporary measure, configure firewall rules to block outbound requests to unknown servers.
Original NVD description (English source)
In OpenStack Swift before 2.37.2, proxy-server does not strip internal update headers (X-Container-Host, X-Container-Device, X-Delete-At-Host, X-Delete-At-Device) from client requests before forwarding them to object-servers. An authenticated user with write access can inject these headers to redirect container update requests to an attacker-controlled server, enabling server-side request forgery. The SSRF requests expose internal cluster metadata including storage policy indexes, partition mappings, device names, and when at rest encryption is enabled, cipher text and initialization vectors for the container-level encryption key. The attacker can also cause "ghost listings" in arbitrary containers via the shard-range redirect mechanism.