Vulnerabilities in pkg:pypi/apscheduler

PACKAGE

Advisory Identifier: GHSA-9cfw-f3f9-7mm7

Advisory Summary

CVE-2026-31072 is a CRITICAL (CVSS 9.8) remote code execution vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Apscheduler libraries in the PyPI ecosystem. The issue involves apscheduler's jsonserializer and cborserializer are vulnerable to remote code execution (rce) via insecure deserialization. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)

Package Vulnerability Intelligence

pkg:pypi/apscheduler

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:pypi/apscheduler. Select an advisory below to view technical details or fixes.

Advisory ID	CVE / NVD	Severity	Summary
GHSA-9cfw-f3f9-7mm7	CVE-2026-31072	CRITICAL	APScheduler's JSONSerializer and CBORSerializer are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization

CVE-2026-31072 at a Glance

CVE Identifier CVE-2026-31072

GHSA Identifier GHSA-9cfw-f3f9-7mm7

Severity CRITICAL

CVSS v3.1 Base Score 9.8

CWE Classification CWE-502: Deserialization of Untrusted Data

Affected Product Apscheduler

Package Ecosystem PyPI

Published Date 2026-05-19

Last Updated 2026-06-04

Security Impact

CVSS: 9.8

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

Attack Vector Network (AV:N)

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-2026-31072

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

apscheduler fixed: Latest secure release

pip install apscheduler>=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 apscheduler

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-31072, inspect your installed packages using pip:

pip show apscheduler

Analyze the terminal output to locate any version of Apscheduler 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 apscheduler command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Apscheduler, 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

The JSONSerializer and CBORSerializer in APScheduler (all versions including 3.10.x and 4.0.0a5) are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization. The unmarshal_object function allows for arbitrary class instantiation and state injection by dynamically importing modules and calling __setstate__ on any class available in the Python environment. An attacker can exploit this by submitting a specially crafted JSON or CBOR payload to an application using these serializers

CVE-2026-31072 Affected Apscheduler Versions

1 component(s)

Product / Package	Ecosystem	Affected Versions	Fixed Version
apscheduler pypi/apscheduler	PyPI	≥ 4.0.0a1 ≤ 4.0.0a6

References

NVD — CVE-2026-31072 NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-31072

Apscheduler Source Repository REPOSITORY

https://gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6

Apscheduler Source Repository REPOSITORY

https://github.com/agronholm/apscheduler

Frequently Asked Questions

What is CVE-2026-31072?

CVE-2026-31072 is a security vulnerability in Apscheduler involving APScheduler's JSONSerializer and CBORSerializer are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization under CWE-502: Deserialization of Untrusted Data.

Which Apscheduler versions are affected?

Affected versions include releases prior to current release patches across affected packages: apscheduler.

What version fixes CVE-2026-31072?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

Is apscheduler affected?

Yes, apscheduler 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-2026-31072?

CVE-2026-31072 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

What CWE is associated with CVE-2026-31072?

CVE-2026-31072 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).

How can I check PyPI dependencies for CVE-2026-31072?

Run the dependency tree command: 'pip show apscheduler'. 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-9cfw-f3f9-7mm7",
  "modified" : "2026-06-04T21:36:43Z",
  "published" : "2026-05-19T18:32:11Z",
  "aliases" : [ "CVE-2026-31072" ],
  "summary" : "APScheduler's JSONSerializer and CBORSerializer are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization",
  "details" : "The JSONSerializer and CBORSerializer in APScheduler (all versions including 3.10.x and 4.0.0a5) are vulnerable to Remote Code Execution (RCE) via Insecure Deserialization. The unmarshal_object function allows for arbitrary class instantiation and state injection by dynamically importing modules and calling __setstate__ on any class available in the Python environment. An attacker can exploit this by submitting a specially crafted JSON or CBOR payload to an application using these serializers",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "apscheduler"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0a1"
      }, {
        "last_affected" : "4.0.0a6"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-31072"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/nedlir/11fb77f35a59cbba73392a086b02a9c6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/agronholm/apscheduler"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-04T21:36:43Z",
    "nvd_published_at" : "2026-05-19T16:16:20Z"
  }
}

CVSS V3

9.8 CRITICAL