FKIE_CVE-2026-47699

Vulnerability from fkie_nvd - Published: 2026-08-18 22:16 - Updated: 2026-08-21 20:16
Severity
6.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Summary
Confidential Containers Guest Components provides guest tools and components for confidential container workloads. From 0.16.0 until 0.20.0, a crafted OCI image layer can make image_rs::stream::unpack::unpack() create a hardlink outside its destination directory. In image-rs/src/stream/unpack.rs, try_hardlink_fallback() validates the hardlink source but computes the destination with destination.join(&entry_rel). Rust Path::join replaces the base when entry_rel is an absolute tar entry path, so fs::hard_link(&src_canon, &dst_entry_abs) can write attacker-controlled content to an arbitrary absolute path. In Confidential Containers the workload owner already controls trusted image content, so the issue is a workload-owner escape into the pod virtual machine rather than a crossing of the image trust boundary, but it may enable access to pod virtual machine capabilities and attestation abuse. This issue is fixed in version 0.20.0.
References
security-advisories@github.comhttps://github.com/confidential-containers/guest-components/commit/14fbb711af0b29bb9cad307969d57b0de9b85d7f
security-advisories@github.comhttps://github.com/confidential-containers/guest-components/commit/7cc1bc458973310296e58aedbb15cb7963297bbe
security-advisories@github.comhttps://github.com/confidential-containers/guest-components/pull/1440
security-advisories@github.comhttps://github.com/confidential-containers/guest-components/pull/1457
security-advisories@github.comhttps://github.com/confidential-containers/guest-components/releases/tag/v0.20.0
security-advisories@github.comhttps://github.com/confidential-containers/guest-components/security/advisories/GHSA-84rc-2q4r-45pc
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "guest-components",
          "vendor": "confidential-containers",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.16.0, \u003c 0.20.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Confidential Containers Guest Components provides guest tools and components for confidential container workloads. From 0.16.0 until 0.20.0, a crafted OCI image layer can make image_rs::stream::unpack::unpack() create a hardlink outside its destination directory. In image-rs/src/stream/unpack.rs, try_hardlink_fallback() validates the hardlink source but computes the destination with destination.join(\u0026entry_rel). Rust Path::join replaces the base when entry_rel is an absolute tar entry path, so fs::hard_link(\u0026src_canon, \u0026dst_entry_abs) can write attacker-controlled content to an arbitrary absolute path. In Confidential Containers the workload owner already controls trusted image content, so the issue is a workload-owner escape into the pod virtual machine rather than a crossing of the image trust boundary, but it may enable access to pod virtual machine capabilities and attestation abuse. This issue is fixed in version 0.20.0."
    }
  ],
  "id": "CVE-2026-47699",
  "lastModified": "2026-08-21T20:16:35.470",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-47699",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-21T19:17:03.503833Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-18T22:16:52.127",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/confidential-containers/guest-components/commit/14fbb711af0b29bb9cad307969d57b0de9b85d7f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/confidential-containers/guest-components/commit/7cc1bc458973310296e58aedbb15cb7963297bbe"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/confidential-containers/guest-components/pull/1440"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/confidential-containers/guest-components/pull/1457"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/confidential-containers/guest-components/releases/tag/v0.20.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/confidential-containers/guest-components/security/advisories/GHSA-84rc-2q4r-45pc"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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