CVE-2026-19730Public exploitHinoki check available

Host-access retention via non-truncating Quadlet replacement

Published Aug 13, 2026 · Updated Aug 13, 2026

Improper file replacement in Podman allows local users to retain removed Quadlet directives through a shorter replacement file. The quadlet.go path opens the existing destination without O_TRUNC, and ReflinkOrCopy overwrites only the new length when its reflink attempt falls back to io.Copy. The invoking local user must already control the Quadlet; a valid retained capability or volume directive can preserve unintended container access to host resources.

CVSS severity4.2
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper file replacement in Podman allows local users to retain removed Quadlet directives through a shorter replacement file. The quadlet.go path opens the existing destination without O_TRUNC, and ReflinkOrCopy overwrites only the new length when its reflink attempt falls back to io.Copy. The invoking local user must already control the Quadlet; a valid retained capability or volume directive can preserve unintended container access to host resources.

The record

CVE
CVE-2026-19730
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-20, CWE-459, T1543.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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 Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Hardened ImagesAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

Published CVSS scores

4.2Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-459Incomplete Cleanup
T1543.002Create or Modify System Process: Systemd Service

Public exploit references

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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