CVE-2026-43826

Description

The OpenSearch logging provider, when configured with a `host` URL that embeds credentials (for example `https://user:[email protected]: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.

CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS — Exploit Prediction

0.0005

Probability of exploitation

0.16%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-532 CWE-532

Affected Products

Vendor	Product	Versions
apache	apache-airflow-providers-opensearch	< 1.9.1

References

Advisories & Patches

https://github.com/apache/airflow/pull/65509 https://lists.apache.org/thread/bxsrqx1vwssovnwnrvgh9xcosptmf73y

Other References

http://www.openwall.com/lists/oss-security/2026/05/10/2

Frequently Asked Questions

What is CVE-2026-43826? +

The OpenSearch logging provider, when configured with a `host` URL that embeds credentials (for example `https://user:[email protected]: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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-43826? +

CVE-2026-43826 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0005, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-43826? +

CVE-2026-43826 affects products from apache, specifically: apache-airflow-providers-opensearch. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-43826? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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