CVE-2026-88265

Host file write and chown via symlinked stdio

Published Sep 10, 2026 · Updated Sep 10, 2026

Link following in Red Hat Hardened Images with crun 1.29.1 and earlier allows local users to write and chown a host file. After pivot_root, crun reopens /dev/null for standard input and output without blocking symlink traversal, so an image-controlled link can resolve to a host bind mount. Exploitation requires a malicious image, low privileges, and a configuration that does not mount a fresh /dev; default fresh-/dev configurations are not exposed.

CVSS severity5.6
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Link following in Red Hat Hardened Images with crun 1.29.1 and earlier allows local users to write and chown a host file. After pivot_root, crun reopens /dev/null for standard input and output without blocking symlink traversal, so an image-controlled link can resolve to a host bind mount. Exploitation requires a malicious image, low privileges, and a configuration that does not mount a fresh /dev; default fresh-/dev configurations are not exposed.

The record

CVE
CVE-2026-88265
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
389 Directory Server
Product
Red Hat Hardened Images
Classifications
CWE-59, T1611
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Hardened ImagesAffected versions are unavailable in this record.

Published CVSS scores

5.6Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
T1611Escape to Host

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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