DragonflyDB Dragonfly up to 1.39.x Cms src/core/cms.cc CMS.INITBYDIM/CMS.INITBYPROB integer overflow

Summaryinfo

A vulnerability marked as critical has been reported in DragonflyDB Dragonfly up to 1.39.x. Affected by this vulnerability is the function CMS.INITBYDIM/CMS.INITBYPROB of the file src/core/cms.cc of the component Cms. The manipulation leads to integer overflow. This vulnerability is uniquely identified as CVE-2026-62357. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in DragonflyDB Dragonfly up to 1.39.x. It has been rated as critical. This issue affects the function CMS.INITBYDIM/CMS.INITBYPROB of the file src/core/cms.cc of the component Cms. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-62357 since 07/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.40.0 eliminates this vulnerability.

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Productinfo

Vendor

• DragonflyDB

Name

• Dragonfly

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38
• 1.39

Website

• Product: https://github.com/dragonflydb/dragonfly/

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