CVE-2026-71190: Swift 1.9.1 to before 2.35.4, 2.36.0 to before 2.36.3, 2.37.0 to before 2.37.3, 2.38.0

Affected technology

Swift · 1.9.1 to before 2.35.4, 2.36.0 to before 2.36.3, 2.37.0 to before 2.37.3, 2.38.0
OpenStack

Description’s affected range: through 2.38.0, the proxy server Accept header parser

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

An unauthenticated remote attacker can send a crafted Accept header that causes exponential CPU consumption in the proxy worker. Vendor/CNA’s CVSS 4.0 assessment (base score 8.7/10) rates confidentiality and integrity impact as none; availability impact as high.