CVE-2026-40251Public exploitNetwork attack vector

Authenticated daemon crash via snapshot bounds check

Published May 6, 2026 · Updated May 6, 2026

Improper array-index validation in Incus before 7.0.0 allows remote authenticated users to crash the daemon through a crafted backup archive. The backup restore and migration paths use len(slice) >= index-1 before indexing Config.Snapshots or Config.VolumeSnapshots at the loop index, so truncated index.yaml metadata triggers an out-of-bounds panic. Access to the storage-volume import feature is required, and repeated crafted imports can keep the affected node offline without reported data exposure or modification.

CVSS severity7.1
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper array-index validation in Incus before 7.0.0 allows remote authenticated users to crash the daemon through a crafted backup archive. The backup restore and migration paths use len(slice) >= index-1 before indexing Config.Snapshots or Config.VolumeSnapshots at the loop index, so truncated index.yaml metadata triggers an out-of-bounds panic. Access to the storage-volume import feature is required, and repeated crafted imports can keep the affected node offline without reported data exposure or modification.

The record

CVE
CVE-2026-40251
Published
May 6, 2026
Updated
May 6, 2026
Vendor
Linux Containers
Product
Incus
Classifications
CWE-129, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record 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=< 7.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linux Containers · Incusversion=< 7.0.0

Published CVSS scores

7.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5GitHub, Inc.CVSS:3.1/AV:N/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
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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