CVE-2024-27530: Pywasm3 Pywasm3 Contains A Use-After-Free Vulnerability

HIGH
Advisory Identifier: GHSA-46r6-92jg-22jg
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CVSS 8.4
CWE-416
Published
Advisory Summary

CVE-2024-27530 is a HIGH (CVSS 8.4) pywasm3 contains a use-after-free vulnerability (CWE-416: Use After Free) affecting Pywasm3 libraries in the PyPI ecosystem. The issue involves pywasm3 contains a use-after-free in foreachmodule. Remediation is available in the latest vendor maintenance releases.

CVE-2024-27530 at a Glance

CVE Identifier CVE-2024-27530
GHSA Identifier GHSA-46r6-92jg-22jg
Severity HIGH
CVSS v3.1 Base Score 8.4
CWE Classification CWE-416: Use After Free
Affected Product Pywasm3
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2024-27530

To remediate this vulnerability, upgrade all affected Pywasm3 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

pywasm3 fixed: Latest secure release 
pip install pywasm3>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show pywasm3

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2024-27530, inspect your installed packages using pip:

pip show pywasm3

Analyze the terminal output to locate any version of Pywasm3 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show pywasm3 command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-416: Use After Free, where the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. In Pywasm3, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

wasm3 139076a contains a Use-After-Free in ForEachModule.

CVE-2024-27530 Affected Pywasm3 Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
pywasm3
pypi/pywasm3
PyPI
≤ 0.5.0

References

NVD — CVE-2024-27530 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-27530
Pywasm3 Source Repository REPOSITORY
https://github.com/wasm3/wasm3/issues/458
Pywasm3 Source Repository REPOSITORY
https://gist.github.com/haruki3hhh/94dd274487b58e037bcc8839dc88b203
Pywasm3 Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/pywasm3/PYSEC-2024-306.yaml
Pywasm3 Source Repository REPOSITORY
https://github.com/wasm3/pywasm3
Pywasm3 Source Repository REPOSITORY
https://github.com/wasm3/pywasm3/blob/main/wasm3/m3_env.c#L202

Frequently Asked Questions

What is CVE-2024-27530?
CVE-2024-27530 is a security vulnerability in Pywasm3 involving pywasm3 contains a Use-After-Free in ForEachModule under CWE-416: Use After Free.
Which Pywasm3 versions are affected?
Affected versions include releases prior to current release patches across affected packages: pywasm3.
What version fixes CVE-2024-27530?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is pywasm3 affected?
Yes, pywasm3 is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2024-27530?
CVE-2024-27530 has a CVSS v3.1 base score of 8.4 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2024-27530?
CVE-2024-27530 is classified under CWE-416: Use After Free (The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.).
How can I check PyPI dependencies for CVE-2024-27530?
Run the dependency tree command: 'pip show pywasm3'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-46r6-92jg-22jg",
  "modified" : "2026-06-09T19:09:07Z",
  "published" : "2024-11-09T00:30:42Z",
  "aliases" : [ "CVE-2024-27530" ],
  "summary" : "pywasm3 contains a Use-After-Free in ForEachModule",
  "details" : "wasm3 139076a contains a Use-After-Free in ForEachModule.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "pywasm3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-27530"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/wasm3/wasm3/issues/458"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/haruki3hhh/94dd274487b58e037bcc8839dc88b203"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/pywasm3/PYSEC-2024-306.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/wasm3/pywasm3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/wasm3/pywasm3/blob/main/wasm3/m3_env.c#L202"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-416" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-09T19:09:07Z",
    "nvd_published_at" : "2024-11-08T22:15:15Z"
  }
}