CVE-2019-11923: Facebook Mcrouter

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

In Mcrouter prior to v0.41.0, the deprecated ASCII parser would allocate a buffer to a user-specified length with no maximum length enforced, allowing for resource exhaustion or denial of service.

Affected products

• Facebook Mcrouter: before 0.41.0 (fixed in 0.41.0)

Published 2019-12-04. Last modified 2026-06-17.