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CVE-2026-41648— Incus: Unbounded YAML Metadata Decode via Parsing

Quick assessment

Affected
lxc incus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Incus是LXC开源的一个系统容器和虚拟机管理器。 Incus 7.0.0之前版本存在安全漏洞，该漏洞源于未限制解压后的YAML文件大小，可能导致经过身份验证的用户通过提供特制镜像或备份tarball导致服务器内存耗尽。

AI Predicted 5.0 Difficulty: Easy EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
lxc incus < 7.0.0 affected
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I. Basic Information for CVE-2026-41648

Vulnerability Information
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Vulnerability Title
Incus: Unbounded YAML Metadata Decode via Parsing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Incus 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Incus是LXC开源的一个系统容器和虚拟机管理器。 Incus 7.0.0之前版本存在安全漏洞，该漏洞源于未限制解压后的YAML文件大小，可能导致经过身份验证的用户通过提供特制镜像或备份tarball导致服务器内存耗尽。
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
lxc incus < 7.0.0 -

II. Public POCs for CVE-2026-41648

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III. Intelligence Information for CVE-2026-41648

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Vendor Advisories for CVE-2026-41648 (1)

Vendor Pages for CVE-2026-41648 (1)

Same Patch Batch · lxc · 2026-05-07 · 4 CVEs total

CVE-2026-41684 6.5 MEDIUM Incus: Nil Dereferences on Restore via Malformed YAML
CVE-2026-41647 6.5 MEDIUM Incus: Nil-Pointer Dereference via S3 Bucket Import
CVE-2026-41685 4.3 MEDIUM Incus: Unbounded binary import disk exhaustion

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-770

V. Comments for CVE-2026-41648

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