CVE-2026-47766Hinoki check available

Host file modification via followed rootfs symlink

Published Aug 14, 2026 · Updated Aug 14, 2026

Symlink following in Containers crun before 1.28 allows local users to alter host files through a crafted OCI bundle. The create_missing_devs() path opens rootfs/dev without O_NOFOLLOW, then uses the descriptor for mknodat(), symlinkat(), and forced unlinkat() operations. Exploitation requires rootful processing of a bundle whose rootfs/dev is a symlink and whose configuration omits a /dev mount; device nodes and symlinks are created outside the rootfs, and an existing ptmx file is replaced.

CVSS severity5.1
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Symlink following in Containers crun before 1.28 allows local users to alter host files through a crafted OCI bundle. The create_missing_devs() path opens rootfs/dev without O_NOFOLLOW, then uses the descriptor for mknodat(), symlinkat(), and forced unlinkat() operations. Exploitation requires rootful processing of a bundle whose rootfs/dev is a symlink and whose configuration omits a /dev mount; device nodes and symlinks are created outside the rootfs, and an existing ptmx file is replaced.

The record

CVE
CVE-2026-47766
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
Containers
Product
crun
Classifications
CWE-61, T1565.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 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=< 1.28

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Containers · crunversion=< 1.28

Published CVSS scores

5.1Debian Security TrackerCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-61UNIX Symbolic Link (Symlink) Following
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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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