Vulnerability-Lookup

CVE-2026-18477 (GCVE-0-2026-18477)

Vulnerability from cvelistv5 – Published: 2026-08-03 15:34 – Updated: 2026-08-05 06:28

Title

Tar: tar: toctou in incremental dumpdir 'x' rename handling allows restore path escape

Summary

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Severity

4.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 16:25 UTC

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

redhat

References

3 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:49361	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-18477	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2509735	issue-trackingx_refsource_REDHAT

Impacted products

8 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 1.35-9.1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Hardened Images	cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-07-31 00:00

Credits

Red Hat would like to thank Marcin Wyczechowski (AFINE Team) and Michał Majchrowicz (AFINE Team) for reporting this issue.

Show details on NVD website

JSON

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GHSA-V7FX-GJVH-347C

Vulnerability from github – Published: 2026-08-03 18:30 – Updated: 2026-08-05 09:31

Details

Severity

4.4 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-18477"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-367"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-03T17:16:33Z",
    "severity": "MODERATE"
  },
  "details": "A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar\u0027s incremental dumpdir \u0027X\u0027 rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows\u2014including extracting into a newly created directory without using the -P option do not mitigate the issue.",
  "id": "GHSA-v7fx-gjvh-347c",
  "modified": "2026-08-05T09:31:14Z",
  "published": "2026-08-03T18:30:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18477"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:49361"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-18477"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509735"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

RHSA-2026:49361

Vulnerability from csaf_redhat - Published: 2026-08-01 13:24 - Updated: 2026-08-09 13:59

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: tar: * tar-1.35-9.1.hum1 (aarch64, x86_64) * tar-1.35-9.1.hum1.src (src) Security Fix(es): tar: * CVE-2026-18477

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-18477

4.4 (Medium)


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

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:tar-main@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:tar-main@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:tar-main@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:49361	self
https://access.redhat.com/security/cve/CVE-2026-18477	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-18477	self
https://bugzilla.redhat.com/show_bug.cgi?id=2509735	external
https://www.cve.org/CVERecord?id=CVE-2026-18477	external
https://nvd.nist.gov/vuln/detail/CVE-2026-18477	external

Acknowledgments

AFINE Team Michał Majchrowicz Marcin Wyczechowski

JSON

To clipboard

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            "Red Hat Hardened Images:tar-main@aarch64",
            "Red Hat Hardened Images:tar-main@src",
            "Red Hat Hardened Images:tar-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:tar-main@aarch64",
            "Red Hat Hardened Images:tar-main@src",
            "Red Hat Hardened Images:tar-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "tar: tar: TOCTOU in incremental dumpdir \u0027X\u0027 rename handling allows restore path escape"
    }
  ]
}

ubuntu-cve-2026-18477

Vulnerability from osv_ubuntu

Published

2026-08-03 17:16

Modified

2026-08-06 00:12

Summary

Details

Severity

4.4 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-18477	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-18477	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2509735	REPORT
	https://access.redhat.com/security/cve/CVE-2026-18477	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tar",
            "binary_version": "1.27.1-1ubuntu0.1+esm7"
          },
          {
            "binary_name": "tar-scripts",
            "binary_version": "1.27.1-1ubuntu0.1+esm7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "tar",
        "purl": "pkg:deb/ubuntu/tar@1.27.1-1ubuntu0.1+esm7?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.26+dfsg-8",
        "1.27-3",
        "1.27-4",
        "1.27.1-1",
        "1.27.1-1ubuntu0.1",
        "1.27.1-1ubuntu0.1+esm1",
        "1.27.1-1ubuntu0.1+esm2",
        "1.27.1-1ubuntu0.1+esm3",
        "1.27.1-1ubuntu0.1+esm4",
        "1.27.1-1ubuntu0.1+esm5",
        "1.27.1-1ubuntu0.1+esm6",
        "1.27.1-1ubuntu0.1+esm7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tar",
            "binary_version": "1.28-2.1ubuntu0.2+esm6"
          },
          {
            "binary_name": "tar-scripts",
            "binary_version": "1.28-2.1ubuntu0.2+esm6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "tar",
        "purl": "pkg:deb/ubuntu/tar@1.28-2.1ubuntu0.2+esm6?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.27.1-2",
        "1.28-2ubuntu1",
        "1.28-2.1",
        "1.28-2.1ubuntu0.1",
        "1.28-2.1ubuntu0.2",
        "1.28-2.1ubuntu0.2+esm1",
        "1.28-2.1ubuntu0.2+esm2",
        "1.28-2.1ubuntu0.2+esm3",
        "1.28-2.1ubuntu0.2+esm4",
        "1.28-2.1ubuntu0.2+esm5",
        "1.28-2.1ubuntu0.2+esm6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tar",
            "binary_version": "1.29b-2ubuntu0.4+esm4"
          },
          {
            "binary_name": "tar-scripts",
            "binary_version": "1.29b-2ubuntu0.4+esm4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "tar",
        "purl": "pkg:deb/ubuntu/tar@1.29b-2ubuntu0.4+esm4?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.29b-2",
        "1.29b-2ubuntu0.1",
        "1.29b-2ubuntu0.2",
        "1.29b-2ubuntu0.3",
        "1.29b-2ubuntu0.4",
        "1.29b-2ubuntu0.4+esm1",
        "1.29b-2ubuntu0.4+esm2",
        "1.29b-2ubuntu0.4+esm3",
        "1.29b-2ubuntu0.4+esm4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tar",
            "binary_version": "1.30+dfsg-7ubuntu0.20.04.4+esm3"
          },
          {
            "binary_name": "tar-scripts",
            "binary_version": "1.30+dfsg-7ubuntu0.20.04.4+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "tar",
        "purl": "pkg:deb/ubuntu/tar@1.30+dfsg-7ubuntu0.20.04.4+esm3?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.30+dfsg-6",
        "1.30+dfsg-7",
        "1.30+dfsg-7ubuntu0.20.04.1",
        "1.30+dfsg-7ubuntu0.20.04.2",
        "1.30+dfsg-7ubuntu0.20.04.3",
        "1.30+dfsg-7ubuntu0.20.04.4",
        "1.30+dfsg-7ubuntu0.20.04.4+esm1",
        "1.30+dfsg-7ubuntu0.20.04.4+esm2",
        "1.30+dfsg-7ubuntu0.20.04.4+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tar",
            "binary_version": "1.34+dfsg-1ubuntu0.1.22.04.6"
          },
          {
            "binary_name": "tar-scripts",
            "binary_version": "1.34+dfsg-1ubuntu0.1.22.04.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "tar",
        "purl": "pkg:deb/ubuntu/tar@1.34+dfsg-1ubuntu0.1.22.04.6?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.34+dfsg-1build1",
        "1.34+dfsg-1build2",
        "1.34+dfsg-1build3",
        "1.34+dfsg-1ubuntu0.1.22.04.1",
        "1.34+dfsg-1ubuntu0.1.22.04.2",
        "1.34+dfsg-1ubuntu0.1.22.04.3",
        "1.34+dfsg-1ubuntu0.1.22.04.4",
        "1.34+dfsg-1ubuntu0.1.22.04.5",
        "1.34+dfsg-1ubuntu0.1.22.04.6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tar",
            "binary_version": "1.35+dfsg-3ubuntu0.4"
          },
          {
            "binary_name": "tar-scripts",
            "binary_version": "1.35+dfsg-3ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "tar",
        "purl": "pkg:deb/ubuntu/tar@1.35+dfsg-3ubuntu0.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.34+dfsg-1.2ubuntu1",
        "1.34+dfsg-1.2ubuntu2",
        "1.34+dfsg-1.3ubuntu1",
        "1.34+dfsg-1.4",
        "1.35+dfsg-2~build1",
        "1.35+dfsg-2",
        "1.35+dfsg-3",
        "1.35+dfsg-3build1",
        "1.35+dfsg-3ubuntu0.1",
        "1.35+dfsg-3ubuntu0.2",
        "1.35+dfsg-3ubuntu0.3",
        "1.35+dfsg-3ubuntu0.4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "tar",
            "binary_version": "1.35+dfsg-4ubuntu0.4"
          },
          {
            "binary_name": "tar-scripts",
            "binary_version": "1.35+dfsg-4ubuntu0.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "tar",
        "purl": "pkg:deb/ubuntu/tar@1.35+dfsg-4ubuntu0.4?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.35+dfsg-3.1build1",
        "1.35+dfsg-3.1build2",
        "1.35+dfsg-4",
        "1.35+dfsg-4ubuntu0.1",
        "1.35+dfsg-4ubuntu0.2",
        "1.35+dfsg-4ubuntu0.3",
        "1.35+dfsg-4ubuntu0.4"
      ]
    }
  ],
  "aliases": [],
  "details": "A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar\u0027s incremental dumpdir \u0027X\u0027 rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows\u2014including extracting into a newly created directory without using the -P option do not mitigate the issue.",
  "id": "UBUNTU-CVE-2026-18477",
  "modified": "2026-08-06T00:12:19Z",
  "published": "2026-08-03T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-18477"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-18477"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509735"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-18477"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-18477"
  ]
}

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.

Action not permitted

CVE-2026-18477 (GCVE-0-2026-18477)

GHSA-V7FX-GJVH-347C

RHSA-2026:49361

ubuntu-cve-2026-18477

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature