Vulnerability-Lookup

CVE-2026-50163 (GCVE-0-2026-50163)

Vulnerability from cvelistv5 – Published: 2026-07-17 19:36 – Updated: 2026-07-20 15:01

Title

oras-go: Hardlink entry with relative Linkname escapes extract dir via process CWD resolution in `oras-go` tar extraction

Summary

oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, ensureLinkPath in content/file/utils.go:262-275 validates a hardlink target relative to the extract base but returns the unresolved target, causing os.Link("victim.secret", "<extract_base>/payload.tar.gz/evil_cwd_link") to resolve header.Linkname against the process current working directory for a Typeflag=TypeLink entry such as Name=payload.tar.gz/evil_cwd_link and Linkname="victim.secret" with io.deis.oras.content.unpack: "true", which can expose or tamper with files such as .env, .git/config, .aws/credentials, and ~/.ssh/config. This issue is fixed in version 2.6.2.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-20 15:00 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/oras-project/oras-go/security/…	x_refsource_CONFIRM
https://github.com/oras-project/oras-go/pull/1232	x_refsource_MISC
https://github.com/oras-project/oras-go/commit/c4…	x_refsource_MISC
https://github.com/oras-project/oras-go/releases/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
oras-project	oras-go	Affected: < 2.6.2	guessed

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-50163",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-07-20T15:00:48.168210Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2026-07-20T15:01:16.630Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/oras-project/oras-go/security/advisories/GHSA-fxhp-mv3v-67qp"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "oras-go",
          "vendor": "oras-project",
          "versions": [
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              "version": "\u003c 2.6.2"
            }
          ]
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      "descriptions": [
        {
          "lang": "en",
          "value": "oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, ensureLinkPath in content/file/utils.go:262-275 validates a hardlink target relative to the extract base but returns the unresolved target, causing os.Link(\"victim.secret\", \"\u003cextract_base\u003e/payload.tar.gz/evil_cwd_link\") to resolve header.Linkname against the process current working directory for a Typeflag=TypeLink entry such as Name=payload.tar.gz/evil_cwd_link and Linkname=\"victim.secret\" with io.deis.oras.content.unpack: \"true\", which can expose or tamper with files such as .env, .git/config, .aws/credentials, and ~/.ssh/config. This issue is fixed in version 2.6.2."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N",
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              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-17T19:36:01.254Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/oras-project/oras-go/security/advisories/GHSA-fxhp-mv3v-67qp",
          "tags": [
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          ],
          "url": "https://github.com/oras-project/oras-go/security/advisories/GHSA-fxhp-mv3v-67qp"
        },
        {
          "name": "https://github.com/oras-project/oras-go/pull/1232",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/oras-project/oras-go/pull/1232"
        },
        {
          "name": "https://github.com/oras-project/oras-go/commit/c463c654ab3ef34422c1764cd619806cebf20451",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/oras-project/oras-go/commit/c463c654ab3ef34422c1764cd619806cebf20451"
        },
        {
          "name": "https://github.com/oras-project/oras-go/releases/tag/v2.6.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/oras-project/oras-go/releases/tag/v2.6.2"
        }
      ],
      "source": {
        "advisory": "GHSA-fxhp-mv3v-67qp",
        "discovery": "UNKNOWN"
      },
      "title": "oras-go: Hardlink entry with relative Linkname escapes extract dir via process CWD resolution in `oras-go` tar extraction"
    }
  },
  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-50163",
    "datePublished": "2026-07-17T19:36:01.254Z",
    "dateReserved": "2026-06-03T20:54:20.432Z",
    "dateUpdated": "2026-07-20T15:01:16.630Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-50163",
      "date": "2026-09-16",
      "epss": "0.00346",
      "percentile": "0.28012"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-50163\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-17T20:17:23.943\",\"lastModified\":\"2026-07-23T18:02:00.793\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, ensureLinkPath in content/file/utils.go:262-275 validates a hardlink target relative to the extract base but returns the unresolved target, causing os.Link(\\\"victim.secret\\\", \\\"\u003cextract_base\u003e/payload.tar.gz/evil_cwd_link\\\") to resolve header.Linkname against the process current working directory for a Typeflag=TypeLink entry such as Name=payload.tar.gz/evil_cwd_link and Linkname=\\\"victim.secret\\\" with io.deis.oras.content.unpack: \\\"true\\\", which can expose or tamper with files such as .env, .git/config, .aws/credentials, and ~/.ssh/config. This issue is fixed in version 2.6.2.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"oras-project\",\"product\":\"oras-go\",\"versions\":[{\"version\":\"\u003c 2.6.2\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":4.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-07-20T15:00:48.168210Z\",\"id\":\"CVE-2026-50163\",\"options\":[{\"exploitation\":\"poc\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-22\"},{\"lang\":\"en\",\"value\":\"CWE-59\"}]}],\"references\":[{\"url\":\"https://github.com/oras-project/oras-go/commit/c463c654ab3ef34422c1764cd619806cebf20451\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/oras-project/oras-go/pull/1232\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/oras-project/oras-go/releases/tag/v2.6.2\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/oras-project/oras-go/security/advisories/GHSA-fxhp-mv3v-67qp\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/oras-project/oras-go/security/advisories/GHSA-fxhp-mv3v-67qp\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-04T19:41:33+00:00",
      "cve": "CVE-2026-50163",
      "id": "CVE-2026-50163",
      "initial_release_date": "2026-07-01T21:35:45+00:00",
      "product_status:fixed": "8",
      "product_status:known_affected": "31",
      "product_status:known_not_affected": "84",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "oras-go: Oras-go: Information disclosure and arbitrary file access via crafted tarball hardlinks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50163.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T17:01:34Z",
      "cve": "CVE-2026-50163",
      "id": "CVE-2026-50163",
      "initial_release_date": "2026-07-15T18:50:09Z",
      "product_status:known_affected": "24",
      "product_status:known_not_affected": "76",
      "product_status:recommended": "10",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-50163",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-50163.json",
      "version": "7"
    }
  }
}

RHSA-2026:48913

Vulnerability from csaf_redhat - Published: 2026-07-30 18:55 - Updated: 2026-09-16 13:06

Summary

Red Hat Security Advisory: RHACS 4.10.6 security and bug fix update

Severity

Important

Scope

7 vulnerabilities in this advisory, including CVE-2026-50163.

CVE-2026-50163

A flaw was found in oras-go, a Go library used for managing OCI (Open Container Initiative) artifacts. An attacker can exploit this vulnerability by providing a specially crafted tarball containing a malicious hardlink. When this tarball is extracted, the hardlink can be manipulated to point to files outside the intended extraction location, specifically within the victim's current working directory. This allows an attacker to read sensitive information from the system, and in some cases, could lead to unauthorized access to critical system files if the component is operating with elevated privileges.

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

Fixed: 4 products Known not affected: 43 products

https://access.redhat.com/errata/RHSA-2026:48913

Open the full advisory

ubuntu-cve-2026-50163

Vulnerability from osv_ubuntu

Published

2026-07-17 20:17

Modified

2026-07-29 07:58

Summary

Details

oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, ensureLinkPath in content/file/utils.go:262-275 validates a hardlink target relative to the extract base but returns the unresolved target, causing os.Link("victim.secret", "/payload.tar.gz/evil_cwd_link") to resolve header.Linkname against the process current working directory for a Typeflag=TypeLink entry such as Name=payload.tar.gz/evil_cwd_link and Linkname="victim.secret" with io.deis.oras.content.unpack: "true", which can expose or tamper with files such as .env, .git/config, .aws/credentials, and ~/.ssh/config. This issue is fixed in version 2.6.2.

Severity

7.1 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-50163	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-50163	REPORT
	https://github.com/oras-project/oras-go/security/…	REPORT
	https://github.com/oras-project/oras-go/pull/1232	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-oras-oras-go-dev",
            "binary_version": "1.1.1-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "golang-oras-oras-go",
        "purl": "pkg:deb/ubuntu/golang-oras-oras-go@1.1.1-1ubuntu1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.1-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-oras-oras-go-dev",
            "binary_version": "2.6.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "golang-oras-oras-go",
        "purl": "pkg:deb/ubuntu/golang-oras-oras-go@2.6.0-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.5.0-1",
        "2.6.0-1"
      ]
    }
  ],
  "aliases": [],
  "details": "oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, ensureLinkPath in content/file/utils.go:262-275 validates a hardlink target relative to the extract base but returns the unresolved target, causing os.Link(\"victim.secret\", \"\u003cextract_base\u003e/payload.tar.gz/evil_cwd_link\") to resolve header.Linkname against the process current working directory for a Typeflag=TypeLink entry such as Name=payload.tar.gz/evil_cwd_link and Linkname=\"victim.secret\" with io.deis.oras.content.unpack: \"true\", which can expose or tamper with files such as .env, .git/config, .aws/credentials, and ~/.ssh/config. This issue is fixed in version 2.6.2.",
  "id": "UBUNTU-CVE-2026-50163",
  "modified": "2026-07-29T07:58:08Z",
  "published": "2026-07-17T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-50163"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-50163"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/oras-project/oras-go/security/advisories/GHSA-fxhp-mv3v-67qp"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/oras-project/oras-go/pull/1232"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-50163"
  ]
}

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

CVE-2026-50163 (GCVE-0-2026-50163)

RHSA-2026:48913

ubuntu-cve-2026-50163

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour