CVE-2026-15529: Pyod PyOD Persistence.load Deserializes Untrusted Artifacts Vulnerability

MODERATE
Advisory Identifier: GHSA-997v-r4v7-9f3g
Share
CVSS 6.3
CWE-502 CWE-20
Published
Advisory Summary

CVE-2026-15529 is a MODERATE (CVSS 6.3) pyod persistence.load deserializes untrusted artifacts vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Pyod libraries in the PyPI ecosystem. The issue involves pyod persistence.load deserializes untrusted artifacts before validation. Remediation is available by upgrading affected packages to version 3.6.2.

CVE-2026-15529 at a Glance

CVE Identifier CVE-2026-15529
GHSA Identifier GHSA-997v-r4v7-9f3g
Severity MODERATE
CVSS v3.1 Base Score 6.3
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Pyod
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.3

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

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

How to Fix CVE-2026-15529

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

pyod fixed: 3.6.2 
pip install pyod>=3.6.2
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 pyod

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-15529, inspect your installed packages using pip:

pip show pyod

Analyze the terminal output to locate any version of Pyod in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.6.2), your application is affected.

Note: The pip show pyod 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 Pyod, 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

A vulnerability was detected in yzhao062 pyod 3.5.0/3.5.1/3.5.2. Affected is the function pyod.utils.persistence.load of the file pyod/utils/persistence.py. Performing a manipulation of the argument path results in deserialization. The attack can be initiated remotely. The pull request to fix this issue requires some minor changes.

CVE-2026-15529 Affected Pyod Versions

1 component(s)
Fixed Versions:
3.6.2
Product / Package Ecosystem Affected Versions Fixed Version
pyod
pypi/pyod
PyPI
≥ 3.5.0
< 3.6.2
3.6.2

References

NVD — CVE-2026-15529 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-15529
Pyod Source Repository REPOSITORY
https://github.com/yzhao062/pyod/issues/697
Pyod Source Repository REPOSITORY
https://github.com/yzhao062/pyod/pull/698
Security Fix Commit FIX COMMIT
https://github.com/yzhao062/pyod/commit/16e6e3ad8921a4e18ccc8c2afe474db7d002c001
Pyod Source Repository REPOSITORY
https://github.com/yzhao062/pyod
Pyod Release RELEASE
https://github.com/yzhao062/pyod/releases/tag/v3.6.2
pypi.org/project/pyod/3.6.2 WEB
https://pypi.org/project/pyod/3.6.2
vuldb.com/cve/cve-2026-15529 WEB
https://vuldb.com/cve/CVE-2026-15529
vuldb.com/submit/854559 WEB
https://vuldb.com/submit/854559
vuldb.com/vuln/377872 WEB
https://vuldb.com/vuln/377872
vuldb.com/vuln/377872/cti WEB
https://vuldb.com/vuln/377872/cti

Frequently Asked Questions

What is CVE-2026-15529?
CVE-2026-15529 is a security vulnerability in Pyod involving PyOD persistence.load deserializes untrusted artifacts before validation under CWE-502: Deserialization of Untrusted Data.
Which Pyod versions are affected?
Affected versions include releases prior to 3.6.2 across affected packages: pyod.
What version fixes CVE-2026-15529?
Upgrading to 3.6.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pyod affected?
Yes, pyod is affected in releases prior to 3.6.2. Upgrade your dependency to 3.6.2 or later.
What is the CVSS score of CVE-2026-15529?
CVE-2026-15529 has a CVSS v3.1 base score of 6.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
What CWE is associated with CVE-2026-15529?
CVE-2026-15529 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-2026-15529?
Run the dependency tree command: 'pip show pyod'. 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-997v-r4v7-9f3g",
  "modified" : "2026-09-03T19:19:17Z",
  "published" : "2026-07-13T06:31:31Z",
  "aliases" : [ "CVE-2026-15529" ],
  "summary" : "PyOD persistence.load deserializes untrusted artifacts before validation",
  "details" : "A vulnerability was detected in yzhao062 pyod 3.5.0/3.5.1/3.5.2. Affected is the function pyod.utils.persistence.load of the file pyod/utils/persistence.py. Performing a manipulation of the argument path results in deserialization. The attack can be initiated remotely. The pull request to fix this issue requires some minor changes.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "pyod"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.5.0"
      }, {
        "fixed" : "3.6.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-15529"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yzhao062/pyod/issues/697"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yzhao062/pyod/pull/698"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yzhao062/pyod/commit/16e6e3ad8921a4e18ccc8c2afe474db7d002c001"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/yzhao062/pyod"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yzhao062/pyod/releases/tag/v3.6.2"
  }, {
    "type" : "WEB",
    "url" : "https://pypi.org/project/pyod/3.6.2"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/cve/CVE-2026-15529"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/submit/854559"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/377872"
  }, {
    "type" : "WEB",
    "url" : "https://vuldb.com/vuln/377872/cti"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-502" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-03T19:19:17Z",
    "nvd_published_at" : "2026-07-13T04:16:28Z"
  }
}