MediumCVE-2026-19730

    podman quadlet install --replace does not fully replace the old file (CVE-2026-19730)

    Published Last modified Sources: Red Hat, BSI, OSV, CVE.org, Hersteller

    What is affected, what to do

    The 'podman quadlet install --replace' command opens the existing destination file with O_CREATE|O_WRONLY but omits O_TRUNC. When the initial reflink copy attempt fails (common on non-reflink-capable filesystems including many RHEL default XFS configurations), the fallback in ReflinkOrCopy uses io.Copy which performs a non-truncating write.

    Update Red Hat Enterprise Linux 10 to version 7:5.8.2-9.el10_2, Red Hat Enterprise Linux 9 to version 6:5.8.2-7.el9_8.

    Affected
    • Red Hat Enterprise Linux 10 lt *..7:5.8.2-9.el10_2
    • Red Hat Enterprise Linux 9 lt *..6:5.8.2-7.el9_8
    Fixed in
    • Red Hat Enterprise Linux 10 7:5.8.2-9.el10_2
    • Red Hat Enterprise Linux 9 6:5.8.2-7.el9_8

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    4.2

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    4.2

    CVSS v3

    Severity Medium on the scale from 0 to 10.

    Source: Red Hat, BSI, OSV, CVE.org, Hersteller

    0.1 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 2.7

    Show all metrics
    Severity
    Medium
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    44.21 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    4.2 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    4.2
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.1 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    2.7
    Low — this CVE sits in the lower 10% of all CVEs scored today.
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: proof of concept · not automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 13 August 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-459

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    The 'podman quadlet install --replace' command opens the existing destination file with O_CREATE|O_WRONLY but omits O_TRUNC. When the initial reflink copy attempt fails (common on non-reflink-capable filesystems including many RHEL default XFS configurations), the fallback in ReflinkOrCopy uses io.Copy which performs a non-truncating write. If the original Quadlet is larger than the new Quadlet, the file is not truncated and content from the original is preserved. The command completes with no warning. There is no risk of information leakage as the user already had access to the Quadlet in order to replace it, and in most cases, this would only lead to invalid Quadlet files. However, security-related options from the end of the old Quadlet could be included in the new Quadlet, and if the truncation resulted in a valid Quadlet file, this could result in undesirable behavior. For example, running podman quadlet install --replace to remove a single line from the end of a Quadlet - including security-sensitive content, like AddCapability - will fail, and the option will continue to be used. Further, with Volume Quadlets, this can include additional mounts which can cause content to be unintentionally exposed into containers. If, later, the image is updated then compromised content might be leaked to an attacker. The vulnerable code paths are in pkg/domain/infra/abi/quadlet.go (lines 338-360, O_CREATE|O_WRONLY without O_TRUNC) and vendor/go.podman.io/storage/pkg/fileutils/reflink_linux.go (lines 12-19, non-truncating io.Copy fallback).

    Source: redhat_csaf, BSI WID Portal, BSI CSAF, OSV (Open Source Vulnerabilities), cvelistv5, NVD (NIST), GitHub Security Advisories

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    Red HatRed Hat Ansible Automation Platform 2
    • —
    • —
    Red HatRed Hat Enterprise Linux 10
    • < 7:5.8.2-9.el10_2
    • 7:5.8.2-9.el10_2
    Red HatRed Hat Enterprise Linux 8
    • —
    • —
    Red HatRed Hat Enterprise Linux 9
    • < 6:5.8.2-7.el9_8
    • 6:5.8.2-7.el9_8
    Red HatRed Hat Hardened Images
    • —
    • —
    Red HatRed Hat OpenShift Container Platform 4
    • —
    • —
    Red HatRed Hat OpenShift Dev Spaces
    • —
    • —
    Red HatRed Hat OpenShift Virtualization 4
    • —
    • —
    Red HatRed Hat Quay 3
    • —
    • —
    Open SourcePodman
    • < 6.0.0
    • < 5.8.6
    • 6.0.0
    • 5.8.6
    gogithub.com/containers/podman
    • —
    • —
    gogithub.com/containers/podman/v2
    • —
    • —
    gogithub.com/containers/podman/v3
    • —
    • —
    gogithub.com/containers/podman/v4
    • —
    • —
    gogithub.com/containers/podman/v5
    • 5.7.0
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-459Incomplete Cleanup

      Base

      The product does not properly "clean up" and remove temporary or supporting resources after they have been used.

      Entry at MITRE CWE-459

    References & sources

    • access.redhat.comsecurity/cve/CVE-2026-19730Vulnerability database, x_refsource_REDHAT
    • bugzilla.redhat.comRHBZ#2508234Issue tracking, x_refsource_REDHAT
    • github.compodman-container-tools/podman/issues/29013
    • github.compodman-container-tools/podman/security/advisories/GHSA-fx76-2j3…
    • access.redhat.comRHSA-2026:70201Vendor advisory, x_refsource_REDHAT
    • access.redhat.comRHSA-2026:69961Vendor advisory, x_refsource_REDHAT
    • NVD (NIST)vuln/detail/CVE-2026-19730advisory
    • github.compodman-container-tools/podman/pull/27980web
    • github.compodman-container-tools/podman/commit/0ea4eaee70b7458bcc99d87552…web
    • github.compodman-container-tools/podman/commit/a38a9b7d20915c55e6f3c45110…web
    • github.compodman-container-tools/podman/commit/d3adfdeec7d5c9eee5a6978df3…web
    • github.compodman-container-tools/podman/commit/d4fe9154ec6e32a02d5fcd096c…web
    • github.compodman-container-tools/podmanpackage
    • github.compodman-container-tools/podman/releases/tag/v5.8.6web
    • github.compodman-container-tools/podman/releases/tag/v6.0.0web

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedRed Hat

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/19xxx/CVE-2026-19730.json">CVE-2026-19730</a>

      Source identifier: secalert@redhat.com

    2. Record modifiedRed Hat

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/19xxx/CVE-2026-19730.json">CVE-2026-19730</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:69961

      Source identifier: secalert@redhat.com

    3. Record modifiedRed Hat

      Show 10 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/19xxx/CVE-2026-19730.json">CVE-2026-19730</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:70201
      Referenceadded
      —
      https://access.redhat.com/security/cve/CVE-2026-19730
      Referenceadded
      —
      https://bugzilla.redhat.com/show_bug.cgi?id=2508234
      Referenceadded
      —
      https://github.com/podman-container-tools/podman/issues/29013
      Referenceadded
      —
      https://github.com/podman-container-tools/podman/security/advisories/GHSA-fx76-2j3w-2mx6
      Referenceremoved
      https://access.redhat.com/security/cve/CVE-2026-19730
      —
      Referenceremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2508234
      —
      Referenceremoved
      https://github.com/podman-container-tools/podman/issues/29013
      —
      Referenceremoved
      https://github.com/podman-container-tools/podman/security/advisories/GHSA-fx76-2j3w-2mx6
      —

      Source identifier: secalert@redhat.com

    4. Record modifiedCISA ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://github.com/podman-container-tools/podman/issues/29013
      Referenceremoved
      https://github.com/podman-container-tools/podman/issues/29013
      —

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

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