GHSA-G4V2-CJQP-RFMQ

Vulnerability from github – Published: 2025-12-08 22:15 – Updated: 2025-12-09 19:17
VLAI?
Summary
Critical Use-After-Free in Wasmi's Linear Memory
Details

Summary

A use-after-free vulnerability has been discovered in the linear memory implementation of Wasmi. This issue can be triggered by a WebAssembly module under certain memory growth conditions, potentially leading to memory corruption, information disclosure, or code execution.

Impact

  • Confidentiality: High – attacker-controlled memory reads possible.
  • Integrity: High – memory corruption may allow arbitrary writes.
  • Availability: High – interpreter crashes possible.

Affected Versions

Wasmi v0.41.0 through Wasmi v1.0.0.

Workarounds

  • Upgrade to the latest patched version of Wasmi.
  • Consider limiting the maximum linear memory sizes where feasible.

Credits

This vulnerability was discovered by Robert T. Morris (RTM).

Severity ?
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "wasmi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.41.0"
            },
            {
              "fixed": "0.41.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "wasmi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.42.0"
            },
            {
              "fixed": "0.47.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "wasmi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.50.0"
            },
            {
              "fixed": "0.51.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "wasmi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "1.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-66627"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-08T22:15:49Z",
    "nvd_published_at": "2025-12-09T16:18:21Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nA use-after-free vulnerability has been discovered in the linear memory implementation of Wasmi. This issue can be triggered by a WebAssembly module under certain memory growth conditions, potentially leading to memory corruption, information disclosure, or code execution.\n\n### Impact\n\n- **Confidentiality:** High \u2013 attacker-controlled memory reads possible.\n- **Integrity:** High \u2013 memory corruption may allow arbitrary writes.\n- **Availability:** High \u2013 interpreter crashes possible.\n\n### Affected Versions\n\nWasmi `v0.41.0` through Wasmi `v1.0.0`.\n\n### Workarounds\n\n- Upgrade to the latest patched version of Wasmi.\n- Consider limiting the maximum linear memory sizes where feasible.\n\n### Credits\n\nThis vulnerability was discovered by **Robert T. Morris (RTM)**.",
  "id": "GHSA-g4v2-cjqp-rfmq",
  "modified": "2025-12-09T19:17:35Z",
  "published": "2025-12-08T22:15:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/wasmi-labs/wasmi/security/advisories/GHSA-g4v2-cjqp-rfmq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66627"
    },
    {
      "type": "WEB",
      "url": "https://github.com/wasmi-labs/wasmi/commit/0e6f0d2a8325602c58d6a53ce1c0e6045eb6a490"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/wasmi-labs/wasmi"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Critical Use-After-Free in Wasmi\u0027s Linear Memory"
}


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  • 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.
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  • 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.



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