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CVE-2026-19730

Status: Awaiting AnalysisMedium (4.2)—

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.

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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).

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Podman — PodmanAI

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-19730",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-08-13T18:37:45.571108Z"
        }
      }
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    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "secalert@redhat.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.2,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 3.4,
        "exploitabilityScore": 0.8
      }
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      "source": "secalert@redhat.com",
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          "versions": [
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          "packageName": "ansible-automation-platform-24/eda-controller-rhel8",
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          "packageName": "ansible-automation-platform-25/eda-controller-rhel8",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 8",
          "packageName": "container-tools:rhel8/podman",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
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          "vendor": "Red Hat",
          "product": "Red Hat Hardened Images",
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          "defaultStatus": "unaffected"
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          "cpes": [
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          "product": "Red Hat OpenShift Container Platform 4",
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          "defaultStatus": "unaffected"
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          "vendor": "Red Hat",
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          "packageName": "container-native-virtualization/ocp-virt-validation-checkup-rhel9",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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  "published": "2026-08-13T18:17:25.330",
  "references": [
    {
      "url": "https://access.redhat.com/errata/RHSA-2026:69961",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://access.redhat.com/errata/RHSA-2026:70201",
      "source": "secalert@redhat.com"
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    {
      "url": "https://access.redhat.com/security/cve/CVE-2026-19730",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2508234",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://github.com/podman-container-tools/podman/issues/29013",
      "source": "secalert@redhat.com"
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      "url": "https://github.com/podman-container-tools/podman/security/advisories/GHSA-fx76-2j3w-2mx6",
      "source": "secalert@redhat.com"
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      "url": "https://github.com/podman-container-tools/podman/issues/29013",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
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      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-459"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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.\n\nThere 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.\n\nThe 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)."
    }
  ],
  "lastModified": "2026-10-01T18:17:17.550",
  "sourceIdentifier": "secalert@redhat.com"
}