CVE-2026-41648: CWE-770: Allocation of Resources Without Limits or Throttling in lxc incus
Incus is a system container and virtual machine manager. Prior to version 7.0.0, user provided image and backup tarballs would be unpacked and YAML files parsed without any size restrictions. This was making it easy for an authenticated user to provide a crafted image or backup tarball that when parsed by Incus would lead to a very large YAML document being loaded into memory, potentially causing the entire server to run out of memory. This issue has been patched in version 7.0.0.
AI Analysis
Technical Summary
Incus versions before 7.0.0 improperly handle user-supplied image and backup tarballs by unpacking and parsing YAML files without limits on size. This lack of resource allocation controls (CWE-770) can lead to excessive memory consumption and potential denial of service due to server memory exhaustion. The vulnerability requires an authenticated user to supply crafted tarballs. The vulnerability has a CVSS 4.0 score of 5.3 (medium severity). No known exploits in the wild have been reported. The issue is resolved in Incus version 7.0.0.
Potential Impact
An authenticated user can cause the Incus server to consume excessive memory by providing crafted image or backup tarballs containing very large YAML documents. This can lead to the server running out of memory, potentially causing denial of service or degraded performance. There is no indication of privilege escalation or remote code execution from the provided data.
Mitigation Recommendations
Upgrade Incus to version 7.0.0 or later, where this vulnerability has been patched. Since no official remediation level or patch links are provided beyond this version update, applying this version upgrade is the recommended action. Patch status is confirmed by the vendor stating the issue is fixed in version 7.0.0.
CVE-2026-41648: CWE-770: Allocation of Resources Without Limits or Throttling in lxc incus
Description
Incus is a system container and virtual machine manager. Prior to version 7.0.0, user provided image and backup tarballs would be unpacked and YAML files parsed without any size restrictions. This was making it easy for an authenticated user to provide a crafted image or backup tarball that when parsed by Incus would lead to a very large YAML document being loaded into memory, potentially causing the entire server to run out of memory. This issue has been patched in version 7.0.0.
CVSS v4.0
Score 5.3medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Incus versions before 7.0.0 improperly handle user-supplied image and backup tarballs by unpacking and parsing YAML files without limits on size. This lack of resource allocation controls (CWE-770) can lead to excessive memory consumption and potential denial of service due to server memory exhaustion. The vulnerability requires an authenticated user to supply crafted tarballs. The vulnerability has a CVSS 4.0 score of 5.3 (medium severity). No known exploits in the wild have been reported. The issue is resolved in Incus version 7.0.0.
Potential Impact
An authenticated user can cause the Incus server to consume excessive memory by providing crafted image or backup tarballs containing very large YAML documents. This can lead to the server running out of memory, potentially causing denial of service or degraded performance. There is no indication of privilege escalation or remote code execution from the provided data.
Mitigation Recommendations
Upgrade Incus to version 7.0.0 or later, where this vulnerability has been patched. Since no official remediation level or patch links are provided beyond this version update, applying this version upgrade is the recommended action. Patch status is confirmed by the vendor stating the issue is fixed in version 7.0.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-21T23:58:43.802Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fcadf8cbff5d8610046f81
Added to database: 05/07/2026, 15:21:28 UTC
Last enriched: 05/07/2026, 15:37:04 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 108
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