CVE-2025-26269Public exploit

Daemon crash via Lua integer underflow

Published Apr 17, 2025 · Updated Apr 23, 2025

Integer underflow in Dragonfly through 1.28.2 allows local users to crash the daemon through a crafted Lua command. The bit_tohex function negates INT32_MIN, which remains negative, bypasses the eight-byte length clamp, and drives an out-of-bounds stack-buffer index. Authenticated access to the command interface and execution of the crafted EVAL call are required; success disconnects clients and stops the service.

CVSS severity5.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in Dragonfly through 1.28.2 allows local users to crash the daemon through a crafted Lua command. The bit_tohex function negates INT32_MIN, which remains negative, bypasses the eight-byte length clamp, and drives an out-of-bounds stack-buffer index. Authenticated access to the command interface and execution of the crafted EVAL call are required; success disconnects clients and stops the service.

The record

CVE
CVE-2025-26269
Published
Apr 17, 2025
Updated
Apr 23, 2025
Vendor
DragonflyDB
Product
Dragonfly
Classifications
CWE-191, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.28.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

DragonflyDB · Dragonflyversion=0 <=1.28.2

Published CVSS scores

3.3MITRE CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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