What’s Vulnerable › Vulnerabilities

CVE-2026-62357: DragonflyDB `CMS.INITBYDIM` integer overflow leads to a remote, attacker-controlled heap out-of-bounds write

• Severity: high (CVSS 8.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-18 · updated 2026-10-22
• Weakness: CWE-190

Description

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

References

• https://github.com/dragonflydb/dragonfly/commit/c004623249fe2151dc5d64e21364fb9fb07c90d3
• https://github.com/dragonflydb/dragonfly/pull/7647
• https://github.com/dragonflydb/dragonfly/releases/tag/v1.40.0
• https://github.com/dragonflydb/dragonfly/security/advisories/GHSA-cmmv-h748-v93x
• https://github.com/dragonflydb/dragonfly/security/advisories/GHSA-cmmv-h748-v93x

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