Vulnerability-Lookup

CVE-2026-58494 (GCVE-0-2026-58494)

Vulnerability from cvelistv5 – Published: 2026-07-08 20:22 – Updated: 2026-07-09 13:28

Title

Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination

Summary

Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite host files exposed as FilePerms::READ through wasip1, wasip2, or wasip3 filesystem interfaces. This issue is fixed in versions 24.0.11, 36.0.12, 45.0.3, and 46.0.1.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-09 13:28 UTC

CWE

CWE-281 - Improper Preservation of Permissions
CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

9 references

URL	Tags
https://github.com/bytecodealliance/wasmtime/secu…	x_refsource_CONFIRM
https://github.com/bytecodealliance/wasmtime/comm…	x_refsource_MISC
https://github.com/bytecodealliance/wasmtime/comm…	x_refsource_MISC
https://github.com/bytecodealliance/wasmtime/comm…	x_refsource_MISC
https://github.com/bytecodealliance/wasmtime/comm…	x_refsource_MISC
https://github.com/bytecodealliance/wasmtime/rele…	x_refsource_MISC
https://github.com/bytecodealliance/wasmtime/rele…	x_refsource_MISC
https://github.com/bytecodealliance/wasmtime/rele…	x_refsource_MISC
https://github.com/bytecodealliance/wasmtime/rele…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
bytecodealliance	wasmtime	Affected: < 24.0.11 Affected: >= 25.0.0, < 36.0.12 Affected: >= 37.0.0, < 45.0.3 Affected: >= 46.0.0, < 46.0.1	guessed

Show details on NVD website

JSON

To clipboard

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              "content": {
                "id": "CVE-2026-58494",
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                  },
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                "role": "CISA Coordinator",
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          "tags": [
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        },
        {
          "name": "https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1"
        }
      ],
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        "advisory": "GHSA-4ch3-9j33-3pmj",
        "discovery": "UNKNOWN"
      },
      "title": "Wasmtime: WASI hard links bypass wasmtime-wasi\u0027s FilePerms for destination"
    }
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  "cveMetadata": {
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    "cveId": "CVE-2026-58494",
    "datePublished": "2026-07-08T20:22:16.039Z",
    "dateReserved": "2026-06-30T20:21:25.812Z",
    "dateUpdated": "2026-07-09T13:28:57.055Z",
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      "product_status:known_affected": "2",
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}

FKIE_CVE-2026-58494

Vulnerability from fkie_nvd - Published: 2026-07-08 21:16 - Updated: 2026-07-10 19:10

Severity

6.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0336e167b0e0c
	security-advisories@github.com	https://github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b653f2dd83367
	security-advisories@github.com	https://github.com/bytecodealliance/wasmtime/commit/8a250aac0962ca1364b5f16525720e9d0b39edcd
	security-advisories@github.com	https://github.com/bytecodealliance/wasmtime/commit/d3ceb56ec35f39e02496eeb4e2d9c7f4fb964d9e
	security-advisories@github.com	https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.11
	security-advisories@github.com	https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.12
	security-advisories@github.com	https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.3
	security-advisories@github.com	https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1
	security-advisories@github.com	https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "wasmtime",
          "vendor": "bytecodealliance",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 24.0.11"
            },
            {
              "status": "affected",
              "version": "\u003e= 25.0.0, \u003c 36.0.12"
            },
            {
              "status": "affected",
              "version": "\u003e= 37.0.0, \u003c 45.0.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 46.0.0, \u003c 46.0.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite host files exposed as FilePerms::READ through wasip1, wasip2, or wasip3 filesystem interfaces. This issue is fixed in versions 24.0.11, 36.0.12, 45.0.3, and 46.0.1."
    }
  ],
  "id": "CVE-2026-58494",
  "lastModified": "2026-07-10T19:10:59.333",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.0,
        "impactScore": 4.0,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-58494",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-09T13:28:46.718754Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-08T21:16:54.000",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0336e167b0e0c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b653f2dd83367"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bytecodealliance/wasmtime/commit/8a250aac0962ca1364b5f16525720e9d0b39edcd"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bytecodealliance/wasmtime/commit/d3ceb56ec35f39e02496eeb4e2d9c7f4fb964d9e"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.11"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.12"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-281"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

RHSA-2026:38187

Vulnerability from csaf_redhat - Published: 2026-07-11 01:14 - Updated: 2026-09-17 05:09

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

2 vulnerabilities in this advisory.

Open the full advisory

rustsec-2026-0188

Vulnerability from osv_rustsec

Published

2026-06-24 12:00

Modified

2026-07-13 17:31

Summary

WASI hard links and renames bypass wasmtime-wasi's FilePerms for destination

Details

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj For more information see the GitHub-hosted security advisory.

Severity

6.5 (Medium)


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

References

URL

Type

	https://crates.io/crates/wasmtime-wasi	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2026-0188.html	ADVISORY
	https://github.com/bytecodealliance/wasmtime/secu…	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "wasmtime-wasi",
        "purl": "pkg:cargo/wasmtime-wasi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "24.0.11"
            },
            {
              "introduced": "25.0.0"
            },
            {
              "fixed": "36.0.12"
            },
            {
              "introduced": "37.0.0"
            },
            {
              "fixed": "45.0.3"
            },
            {
              "introduced": "46.0.0"
            },
            {
              "fixed": "46.0.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-4ch3-9j33-3pmj",
    "CVE-2026-58494"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "This is an entry in the RustSec database for the Wasmtime security advisory\nlocated at\nhttps://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj\nFor more information see the GitHub-hosted security advisory.",
  "id": "RUSTSEC-2026-0188",
  "modified": "2026-07-13T17:31:41Z",
  "published": "2026-06-24T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/wasmtime-wasi"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0188.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "WASI hard links and renames bypass wasmtime-wasi\u0027s FilePerms for destination"
}

ubuntu-cve-2026-58494

Vulnerability from osv_ubuntu

Published

2026-07-08 21:16

Modified

2026-07-15 17:53

Summary

Details

Severity

6.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-58494	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-58494	REPORT
	https://github.com/bytecodealliance/wasmtime/comm…	REPORT
	https://github.com/bytecodealliance/wasmtime/comm…	REPORT
	https://github.com/bytecodealliance/wasmtime/comm…	REPORT
	https://github.com/bytecodealliance/wasmtime/comm…	REPORT
	https://github.com/bytecodealliance/wasmtime/rele…	REPORT
	https://github.com/bytecodealliance/wasmtime/rele…	REPORT
	https://github.com/bytecodealliance/wasmtime/rele…	REPORT
	https://github.com/bytecodealliance/wasmtime/rele…	REPORT
	https://github.com/bytecodealliance/wasmtime/secu…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-cranelift-dev",
            "binary_version": "0.103.0+16.0.0+dfsg-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "rust-wasmtime",
        "purl": "pkg:deb/ubuntu/rust-wasmtime@16.0.0+dfsg-3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "10.0.1+dfsg-7",
        "15.0.1+dfsg-4",
        "16.0.0+dfsg-2",
        "16.0.0+dfsg-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-cranelift-dev",
            "binary_version": "0.113.1+26.0.1+dfsg-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "rust-wasmtime",
        "purl": "pkg:deb/ubuntu/rust-wasmtime@26.0.1+dfsg-3?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "26.0.1+dfsg-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-cranelift-dev",
            "binary_version": "0.123.5+36.0.5+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "rust-wasmtime",
        "purl": "pkg:deb/ubuntu/rust-wasmtime@36.0.5+dfsg-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "26.0.1+dfsg-3",
        "26.0.1+dfsg-4",
        "28.0.1+dfsg-3",
        "29.0.1+dfsg-5",
        "36.0.5+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite host files exposed as FilePerms::READ through wasip1, wasip2, or wasip3 filesystem interfaces. This issue is fixed in versions 24.0.11, 36.0.12, 45.0.3, and 46.0.1.",
  "id": "UBUNTU-CVE-2026-58494",
  "modified": "2026-07-15T17:53:45Z",
  "published": "2026-07-08T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-58494"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-58494"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0336e167b0e0c"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b653f2dd83367"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bytecodealliance/wasmtime/commit/8a250aac0962ca1364b5f16525720e9d0b39edcd"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bytecodealliance/wasmtime/commit/d3ceb56ec35f39e02496eeb4e2d9c7f4fb964d9e"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.11"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.12"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.3"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-58494"
  ]
}

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-2026-58494 (GCVE-0-2026-58494)

FKIE_CVE-2026-58494

RHSA-2026:38187

rustsec-2026-0188

Vulnerability from osv_rustsec

ubuntu-cve-2026-58494

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour