Vulnerability-Lookup

UBUNTU-CVE-2026-33055 (CVE-2026-33055)

Vulnerability from osv_ubuntu – Published: 2026-03-20 07:16 – Updated: 2026-05-20 15:27 – Source website

Details

tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44 and below have conditional logic that skips the PAX size header in cases where the base header size is nonzero. As part of CVE-2025-62518, the astral-tokio-tar project was changed to correctly honor PAX size headers in the case where it was different from the base header. This is almost the inverse of the astral-tokio-tar issue. Any discrepancy in how tar parsers honor file size can be used to create archives that appear differently when unpacked by different archivers. In this case, the tar-rs (Rust tar) crate is an outlier in checking for the header size - other tar parsers (including e.g. Go archive/tar) unconditionally use the PAX size override. This can affect anything that uses the tar crate to parse archives and expects to have a consistent view with other parsers. This issue has been fixed in version 0.4.45.

Severity

5.1 (Medium)


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

8.1 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-33055	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-33055	REPORT
	https://github.com/alexcrichton/tar-rs/commit/de1…	REPORT
	https://github.com/alexcrichton/tar-rs/security/a…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-62518	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-tar+default-dev",
            "binary_version": "0.4.26-1ubuntu0.1"
          },
          {
            "binary_name": "librust-tar-dev",
            "binary_version": "0.4.26-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "rust-tar",
        "purl": "pkg:deb/ubuntu/rust-tar@0.4.26-1ubuntu0.1?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4.26-1",
        "0.4.26-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-tar+default-dev",
            "binary_version": "0.4.37-3ubuntu0.1+esm1"
          },
          {
            "binary_name": "librust-tar-dev",
            "binary_version": "0.4.37-3ubuntu0.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "rust-tar",
        "purl": "pkg:deb/ubuntu/rust-tar@0.4.37-3ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4.26-1",
        "0.4.37-1",
        "0.4.37-3",
        "0.4.37-3ubuntu0.1~esm1",
        "0.4.37-3ubuntu0.1",
        "0.4.37-3ubuntu0.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-tar-dev",
            "binary_version": "0.4.40-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "rust-tar",
        "purl": "pkg:deb/ubuntu/rust-tar@0.4.40-1ubuntu0.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4.38-2",
        "0.4.40-1",
        "0.4.40-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-tar-dev",
            "binary_version": "0.4.43-4ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "rust-tar",
        "purl": "pkg:deb/ubuntu/rust-tar@0.4.43-4ubuntu0.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4.43-4",
        "0.4.43-4ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-tar-dev",
            "binary_version": "0.4.45-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rust-tar",
        "purl": "pkg:deb/ubuntu/rust-tar@0.4.45-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4.43-4",
        "0.4.44-1",
        "0.4.45-1"
      ]
    }
  ],
  "aliases": [],
  "details": "tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44 and below have conditional logic that skips the PAX size header in cases where the base header size is nonzero. As part of CVE-2025-62518, the astral-tokio-tar project was changed to correctly honor PAX size headers in the case where it was different from the base header. This is almost the inverse of the astral-tokio-tar issue. Any discrepancy in how tar parsers honor file size can be used to create archives that appear differently when unpacked by different archivers. In this case, the tar-rs (Rust tar) crate is an outlier in checking for the header size - other tar parsers (including e.g. Go archive/tar) unconditionally use the PAX size override. This can affect anything that uses the tar crate to parse archives and expects to have a consistent view with other parsers. This issue has been fixed in version 0.4.45.",
  "id": "UBUNTU-CVE-2026-33055",
  "modified": "2026-05-20T15:27:21Z",
  "published": "2026-03-20T07:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33055"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-33055"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21a33946"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ff"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-62518"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-33055"
  ]
}

CVE-2026-33055 (GCVE-0-2026-33055)

Vulnerability from cvelistv5 – Published: 2026-03-20 07:06 – Updated: 2026-03-20 15:44

Title

tar-rs incorrectly ignores PAX size headers if header size is nonzero

Summary

Severity

5.1 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-20 15:43 UTC

CWE

CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/alexcrichton/tar-rs/security/a…	x_refsource_CONFIRM
https://github.com/alexcrichton/tar-rs/commit/de1…	x_refsource_MISC
https://www.cve.org/CVERecord?id=CVE-2025-62518	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
alexcrichton	tar-rs	Affected: < 0.4.45

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33055",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-20T15:43:55.137601Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-20T15:44:15.706Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "tar-rs",
          "vendor": "alexcrichton",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.4.45"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "tar-rs is a tar archive reading/writing library for Rust. Versions 0.4.44 and below have conditional logic that skips the PAX size header in cases where the base header size is nonzero. As part of CVE-2025-62518, the astral-tokio-tar project was changed to correctly honor PAX size headers in the case where it was different from the base header. This is almost the inverse of the astral-tokio-tar issue. Any discrepancy in how tar parsers honor file size can be used to create archives that appear differently when unpacked by different archivers. In this case, the tar-rs (Rust tar) crate is an outlier in checking for the header size - other tar parsers (including e.g. Go archive/tar) unconditionally use the PAX size override. This can affect anything that uses the tar crate to parse archives and expects to have a consistent view with other parsers. This issue has been fixed in version 0.4.45."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-843",
              "description": "CWE-843: Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-20T07:06:08.390Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ff",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/alexcrichton/tar-rs/security/advisories/GHSA-gchp-q4r4-x4ff"
        },
        {
          "name": "https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21a33946",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/alexcrichton/tar-rs/commit/de1a5870e603758f430073688691165f21a33946"
        },
        {
          "name": "https://www.cve.org/CVERecord?id=CVE-2025-62518",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-62518"
        }
      ],
      "source": {
        "advisory": "GHSA-gchp-q4r4-x4ff",
        "discovery": "UNKNOWN"
      },
      "title": "tar-rs incorrectly ignores PAX size headers if header size is nonzero"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33055",
    "datePublished": "2026-03-20T07:06:08.390Z",
    "dateReserved": "2026-03-17T18:10:50.213Z",
    "dateUpdated": "2026-03-20T15:44:15.706Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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.
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Action not permitted

UBUNTU-CVE-2026-33055 (CVE-2026-33055)

CVE-2026-33055 (GCVE-0-2026-33055)

Tags

Sightings

Nomenclature

Related by attack behaviour