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CVE-2026-41579— runc: Malicious image with /dev symlink can trigger limited host filesystem integrity violations

Quick assessment

Affected
opencontainers runc
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.

opencontainers runc是opencontainers组织的一款容器运行时管理软件。 opencontainers runc存在后置链接漏洞，该漏洞源于在设置容器根文件系统时，setupPtmx和setupDevSymlinks函数通过filepath.Join字符串调用os.Remove和os.Symlink，允许含有/dev为符号链接的镜像欺骗runc删除主机上名为ptmx的文件，或在任意预存在的主机目录中创建硬编码的特定名称和目标的符号链接。以下版本受到影响：1.3.6之前版本、1.4

CVSS 3.3 · Low EPSS 0.19% · P7

Possible ATT&CK Techniques 1 AI

T1036 · Masquerading

Affected Version Matrix 3

VendorProduct Version RangeStatus
opencontainers runc < 1.3.6 affected
>= 1.4.0-rc.1, < 1.4.3 affected
>= 1.5.0-rc.1, < 1.5.0-rc.3 affected
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I. Basic Information for CVE-2026-41579

Vulnerability Information
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Vulnerability Title
runc: Malicious image with /dev symlink can trigger limited host filesystem integrity violations
Source: CVE Program / CVE List V5
Vulnerability Description
runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
opencontainers runc 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
opencontainers runc是opencontainers组织的一款容器运行时管理软件。 opencontainers runc存在后置链接漏洞，该漏洞源于在设置容器根文件系统时，setupPtmx和setupDevSymlinks函数通过filepath.Join字符串调用os.Remove和os.Symlink，允许含有/dev为符号链接的镜像欺骗runc删除主机上名为ptmx的文件，或在任意预存在的主机目录中创建硬编码的特定名称和目标的符号链接。以下版本受到影响：1.3.6之前版本、1.4
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
opencontainers runc < 1.3.6 -

II. Public POCs for CVE-2026-41579

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III. Intelligence Information for CVE-2026-41579

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Patches & Fixes for CVE-2026-41579 (1)

Vendor Advisories for CVE-2026-41579 (1)

IV. Related Vulnerabilities

Same product: runc
Same vendor: opencontainers
Same weakness: CWE-61

V. Comments for CVE-2026-41579

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