CVE-2026-41648Public exploitNetwork attack vector

Authenticated server interruption via unbounded YAML decoding

Published May 7, 2026 · Updated May 7, 2026

Resource exhaustion in Linux Containers Incus before 7.0.0 allows remote authenticated users to interrupt the server via crafted tarballs. The getImageMetadata and backup.GetInfo paths pass metadata.yaml and backup/index.yaml entries directly to yaml.NewDecoder without checking hdr.Size or limiting reads. Image or backup upload permission is required; a large flat YAML document amplifies memory use in incusd and can exhaust daemon or host memory.

CVSS severity5.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Linux Containers Incus before 7.0.0 allows remote authenticated users to interrupt the server via crafted tarballs. The getImageMetadata and backup.GetInfo paths pass metadata.yaml and backup/index.yaml entries directly to yaml.NewDecoder without checking hdr.Size or limiting reads. Image or backup upload permission is required; a large flat YAML document amplifies memory use in incusd and can exhaust daemon or host memory.

The record

CVE
CVE-2026-41648
Published
May 7, 2026
Updated
May 7, 2026
Vendor
Linux Containers
Product
Incus
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2026CVE publishedPublication date reported by the CVE source.
  2. May 7, 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

5.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

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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