Vulnerability-Lookup

OESA-2026-3456 (CVE-2026-66484)

Vulnerability from osv_openeuler – Published: 2026-08-20 10:00 – Updated: 2026-08-20 10:00 – Source website

Summary

cpio security update

Details

GNU cpio copies files into or out of a cpio or tar archive. The archive can be another file on the disk, a magnetic tape, or a pipe.

Security Fix(es):

GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name is normalized but the tar hard-link target is passed to the link_to_name function without equivalent sanitization before calling link function. A tar archive provided by an attacker, containing a hard-link entry whose linkname is set to an absolute path outside the extraction directory, can cause cpio to create a hard link to an existing file outside the intended extraction directory, breaking the expected guarantee of --no-absolute-filenames and allowing archive-controlled linkage to external files.

This issue has been fixed in commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad(CVE-2026-66484)

GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c. The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial of service.

This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9(CVE-2026-66485)

Severity

4.6 (Medium)


                    
                      CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-66484	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-66485	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "cpio-2.13-9.oe2003sp4.aarch64.rpm",
          "cpio-debuginfo-2.13-9.oe2003sp4.aarch64.rpm",
          "cpio-debugsource-2.13-9.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "cpio-help-2.13-9.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "cpio-2.13-9.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "cpio-2.13-9.oe2003sp4.x86_64.rpm",
          "cpio-debuginfo-2.13-9.oe2003sp4.x86_64.rpm",
          "cpio-debugsource-2.13-9.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "cpio",
        "purl": "pkg:rpm/openEuler/cpio\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.13-9.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "cpio-2.13-12.oe2203sp4.aarch64.rpm",
          "cpio-debuginfo-2.13-12.oe2203sp4.aarch64.rpm",
          "cpio-debugsource-2.13-12.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "cpio-help-2.13-12.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "cpio-2.13-12.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "cpio-2.13-12.oe2203sp4.x86_64.rpm",
          "cpio-debuginfo-2.13-12.oe2203sp4.x86_64.rpm",
          "cpio-debugsource-2.13-12.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
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            {
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            {
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            }
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        }
      ]
    },
    {
      "ecosystem_specific": {
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          "cpio-debuginfo-2.14-5.oe2403sp1.aarch64.rpm",
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        ],
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        ],
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          "cpio-debugsource-2.14-5.oe2403sp1.x86_64.rpm"
        ]
      },
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        "ecosystem": "openEuler:24.03-LTS-SP1",
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    },
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          "cpio-debugsource-2.14-5.oe2403sp3.aarch64.rpm"
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        "noarch": [
          "cpio-help-2.14-5.oe2403sp3.noarch.rpm"
        ],
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          "cpio-debugsource-2.14-5.oe2403sp3.x86_64.rpm"
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          "cpio-debugsource-2.14-5.oe2403sp4.aarch64.rpm"
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    "severity": "Medium"
  },
  "details": "GNU cpio copies files into or out of a cpio or tar archive. The archive can be another file on the disk, a magnetic tape, or a pipe.\r\n\r\nSecurity Fix(es):\n\nGNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name is normalized but the tar hard-link target is passed to the link_to_name function without equivalent sanitization before calling link function. A tar archive provided by an attacker, containing a hard-link entry whose linkname is set to an absolute path outside the extraction directory, can cause cpio to create a hard link to an existing file outside the intended extraction directory, breaking the expected guarantee of --no-absolute-filenames and allowing archive-controlled linkage to external files.\n\nThis issue has been fixed in commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad(CVE-2026-66484)\n\nGNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c. The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial of service.\n\nThis issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9(CVE-2026-66485)",
  "id": "OESA-2026-3456",
  "modified": "2026-08-20T10:00:01Z",
  "published": "2026-08-20T10:00:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3456"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66484"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66485"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "cpio security update",
  "upstream": [
    "CVE-2026-66484",
    "CVE-2026-66485"
  ]
}

CVE-2026-66484 (GCVE-0-2026-66484)

Vulnerability from cvelistv5 – Published: 2026-08-10 10:25 – Updated: 2026-08-10 10:57 X_Open Source

Title

Path Traversal in GNU cpio

Summary

Severity

4.6 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-10 10:57 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

CERT-PL ENISA root

References

2 references

URL	Tags
https://cert.pl/en/posts/2026/08/CVE-2026-66484	third-party-advisory
https://git.savannah.gnu.org/cgit/cpio.git	product

Impacted products

1 product

Vendor	Product	Version
GNU	cpio	Affected: 0 , ≤ 2.15 (custom) cpe:2.3:a:gnu:cpio::::::::

Credits

Michał Majchrowicz (AFINE Team) Marcin Wyczechowski (AFINE Team)

Show details on NVD website

JSON

To clipboard

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CVE-2026-66485 (GCVE-0-2026-66485)

Vulnerability from cvelistv5 – Published: 2026-08-10 10:25 – Updated: 2026-08-10 10:56 X_Open Source

Title

Uncontrolled Memory Allocation in GNU cpio

Summary

Severity

4.6 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-10 10:56 UTC

CWE

CWE-789 - Memory allocation with excessive size value

Assigner

CERT-PL ENISA root

References

2 references

URL	Tags
https://cert.pl/en/posts/2026/08/CVE-2026-66484	third-party-advisory
https://git.savannah.gnu.org/cgit/cpio.git	product

Impacted products

1 product

Vendor	Product	Version
GNU	cpio	Affected: 0 , ≤ 2.15 (custom) cpe:2.3:a:gnu:cpio::::::::

Credits

Michał Majchrowicz (AFINE Team) Marcin Wyczechowski (AFINE Team)

Show details on NVD website

JSON

To clipboard

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            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-789",
              "description": "CWE-789 Memory allocation with excessive size value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-10T10:25:34.337Z",
        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
        "shortName": "CERT-PL"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://cert.pl/en/posts/2026/08/CVE-2026-66484"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://git.savannah.gnu.org/cgit/cpio.git"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "tags": [
        "x_open-source"
      ],
      "title": "Uncontrolled Memory Allocation in GNU cpio",
      "x_generator": {
        "engine": "Vulnogram 1.0.3"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
    "assignerShortName": "CERT-PL",
    "cveId": "CVE-2026-66485",
    "datePublished": "2026-08-10T10:25:34.337Z",
    "dateReserved": "2026-07-27T11:32:08.682Z",
    "dateUpdated": "2026-08-10T10:56:56.427Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2026-3456 (CVE-2026-66484)

CVE-2026-66484 (GCVE-0-2026-66484)

CVE-2026-66485 (GCVE-0-2026-66485)

Tags

Sightings

Nomenclature

Related by attack behaviour