CVE-2026-62357: Dragonflydb Dragonfly

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Dragonfly is an in-memory data store built for modern application workloads. Prior to 1.40.0, CMS.INITBYDIM and CMS.INITBYPROB accept dimensions whose width times depth times sizeof(int64_t) overflows in src/core/cms.cc, allocating an undersized counter buffer while CMS.INCRBY and CMS.QUERY use the unbounded dimensions, which allows an unauthenticated remote client to corrupt or disclose adjacent heap memory and crash the server. This issue is fixed in version 1.40.0.

Affected products

• Dragonflydb Dragonfly: before 1.40.0 (fixed in 1.40.0)

Published 2026-08-18. Last modified 2026-09-10.