CVE-2024-28867: Apple Swift Prometheus

High severity, CVSS 7.4. EPSS: 0.6% chance of exploitation in the next 30 days.

Swift Prometheus is a Swift client for the Prometheus monitoring system, supporting counters, gauges and histograms. In code which applies _un-sanitized string values into metric names or labels_, an attacker could make use of this and send a `?lang` query parameter containing newlines, `}` or similar characters which can lead to the attacker taking over the exported format -- including creating unbounded numbers of stored metrics, inflating server memory usage, or causing "bogus" metrics. This vulnerability is fixed in2.0.0-alpha.2.

Affected products

• Apple Swift Prometheus: version 2.0.0 only

Published 2024-03-29. Last modified 2026-06-17.