CVE-2026-43826: Apache Airflow Providers OpenSearch OpenSearch Task-log Handler Leaks Credentials Vulnerability

MODERATE
Advisory Identifier: GHSA-xccp-97wp-3gjg
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CVSS 6.5
CWE-532
Published
Advisory Summary

CVE-2026-43826 is a MODERATE (CVSS 6.5) opensearch task-log handler leaks credentials vulnerability (CWE-532: Insertion of Sensitive Information into Log File) affecting Apache Airflow Providers OpenSearch libraries in the PyPI ecosystem. The issue involves opensearch task-log handler leaks credentials embedded in the host url. Remediation is available by upgrading affected packages to version 1.9.1.

CVE-2026-43826 at a Glance

CVE Identifier CVE-2026-43826
GHSA Identifier GHSA-xccp-97wp-3gjg
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-532: Insertion of Sensitive Information into Log File
Affected Product Apache Airflow Providers OpenSearch
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.5

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:H/I:N/A:N).

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 High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-43826

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

apache-airflow-providers-opensearch fixed: 1.9.1 
pip install apache-airflow-providers-opensearch>=1.9.1
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 apache-airflow-providers-opensearch

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-43826, inspect your installed packages using pip:

pip show apache-airflow-providers-opensearch

Analyze the terminal output to locate any version of Apache Airflow Providers OpenSearch in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.9.1), your application is affected.

Note: The pip show apache-airflow-providers-opensearch command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-532: Insertion of Sensitive Information into Log File, where the product writes sensitive information to a log file. In Apache Airflow Providers OpenSearch, 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 OpenSearch logging provider, when configured with a `host` URL that embeds credentials (for example `https://user:password@server.example.com:9200`), wrote the full host URL — including the embedded credentials — into task logs. Any user with task-log read permission could harvest the backend credentials. Users are advised to upgrade to `apache-airflow-providers-opensearch` 1.9.1 or later and, as a defense-in-depth measure, configure the backend credentials via a secret backend rather than embedding them in the `[opensearch] host` URL.

CVE-2026-43826 Affected Apache Airflow Providers OpenSearch Versions

1 component(s)
Fixed Versions:
1.9.1
Product / Package Ecosystem Affected Versions Fixed Version
apache-airflow-providers-opensearch
pypi/apache-airflow-providers-opensearch
PyPI
< 1.9.1
1.9.1

References

NVD — CVE-2026-43826 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43826
Apache Airflow Providers OpenSearch Source Repository REPOSITORY
https://github.com/apache/airflow/pull/65509
Security Fix Commit FIX COMMIT
https://github.com/apache/airflow/commit/6a6b6ff409fb48c28bd63482828632a3c5a5bb93
Apache Airflow Providers OpenSearch Source Repository REPOSITORY
https://github.com/apache/airflow
Apache Airflow Providers OpenSearch Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow-providers-opensearch/PYSEC-2026-23.yaml
lists.apache.org/thread/bxsrqx1vwsso... WEB
https://lists.apache.org/thread/bxsrqx1vwssovnwnrvgh9xcosptmf73y
Apache Airflow Providers OpenSearch Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/05/10/2

Frequently Asked Questions

What is CVE-2026-43826?
CVE-2026-43826 is a security vulnerability in Apache Airflow Providers OpenSearch involving OpenSearch task-log handler leaks credentials embedded in the host URL under CWE-532: Insertion of Sensitive Information into Log File.
Which Apache Airflow Providers OpenSearch versions are affected?
Affected versions include releases prior to 1.9.1 across affected packages: apache-airflow-providers-opensearch.
What version fixes CVE-2026-43826?
Upgrading to 1.9.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is apache-airflow-providers-opensearch affected?
Yes, apache-airflow-providers-opensearch is affected in releases prior to 1.9.1. Upgrade your dependency to 1.9.1 or later.
What is the CVSS score of CVE-2026-43826?
CVE-2026-43826 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-43826?
CVE-2026-43826 is classified under CWE-532: Insertion of Sensitive Information into Log File (The product writes sensitive information to a log file.).
How can I check PyPI dependencies for CVE-2026-43826?
Run the dependency tree command: 'pip show apache-airflow-providers-opensearch'. 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-xccp-97wp-3gjg",
  "modified" : "2026-06-05T14:15:13Z",
  "published" : "2026-05-11T09:30:32Z",
  "aliases" : [ "CVE-2026-43826" ],
  "summary" : "Apache Airflow Providers OpenSearch: OpenSearch task-log handler leaks credentials embedded in the host URL",
  "details" : "The OpenSearch logging provider, when configured with a `host` URL that embeds credentials (for example `https://user:password@server.example.com:9200`), wrote the full host URL — including the embedded credentials — into task logs. Any user with task-log read permission could harvest the backend credentials. Users are advised to upgrade to `apache-airflow-providers-opensearch` 1.9.1 or later and, as a defense-in-depth measure, configure the backend credentials via a secret backend rather than embedding them in the `[opensearch] host` URL.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "apache-airflow-providers-opensearch"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.9.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-43826"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/airflow/pull/65509"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/airflow/commit/6a6b6ff409fb48c28bd63482828632a3c5a5bb93"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/airflow"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/apache-airflow-providers-opensearch/PYSEC-2026-23.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/bxsrqx1vwssovnwnrvgh9xcosptmf73y"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/05/10/2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-532" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-15T17:30:13Z",
    "nvd_published_at" : "2026-05-11T09:16:26Z"
  }
}