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

Quick assessment

Affected
dragonflydb dragonfly
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DragonflyDB Dragonfly是DragonflyDB公司的一个框架,可以对任何内容类型进行动态处理。 DragonflyDB Dragonfly 1.40.0之前版本存在数字错误漏洞，该漏洞源于CMS.INITBYDIM和CMS.INITBYPROB接受维度时宽度乘以深度乘以sizeof(int64_t)发生整数溢出，分配过小的计数器缓冲区，可能允许未经身份验证的远程客户端破坏或泄露相邻堆内存并导致服务器崩溃。

CVSS 8.8 · High EPSS 0.52% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
dragonflydb dragonfly < 1.40.0 affected
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I. Basic Information for CVE-2026-62357

Vulnerability Information
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Vulnerability Title
DragonflyDB `CMS.INITBYDIM` integer overflow leads to a remote, attacker-controlled heap out-of-bounds write
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
DragonflyDB Dragonfly 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DragonflyDB Dragonfly是DragonflyDB公司的一个框架,可以对任何内容类型进行动态处理。 DragonflyDB Dragonfly 1.40.0之前版本存在数字错误漏洞，该漏洞源于CMS.INITBYDIM和CMS.INITBYPROB接受维度时宽度乘以深度乘以sizeof(int64_t)发生整数溢出，分配过小的计数器缓冲区，可能允许未经身份验证的远程客户端破坏或泄露相邻堆内存并导致服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
dragonflydb dragonfly < 1.40.0 -

II. Public POCs for CVE-2026-62357

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6843 chars
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Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-62357

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Patches & Fixes for CVE-2026-62357 (2)

Vendor Advisories for CVE-2026-62357 (1)

Vendor Pages for CVE-2026-62357 (1)

IV. Related Vulnerabilities

Same product: dragonfly
Same vendor: dragonflydb
Same weakness: CWE-190

V. Comments for CVE-2026-62357

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