What is CVE-2026-7309?

CVE-2026-7309 is a medium-severity vulnerability in Red Hat Openshift Container Platform 4, classified under Untrusted Search Path. CVSS score: 4.3/10. Published 2026-04-28.

How severe is CVE-2026-7309?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Red Hat Openshift Container Platform 4

CVE-2026-7309

A flaw was found in the OpenShift Container Platform build system. A user with the `edit` ClusterRole can inject arbitrary environment variables, such as `LD_PRELOAD` or `http_proxy`, into `docker-build` containers through the `buildconfigs/instantiate` API. This incomplete fix for a previous vulnerability allows for information disclosure, specifically impacting the confidentiality of build traffic.

Published 2026-04-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (20.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Red Hat Openshift Container Platform 4
Red Hat Openshift Container Platform — versions 4.0

Weakness classification (CWE)

CWE-426 — Untrusted Search Path

References

access.redhat.com/security/cve/CVE-2026-7309 (vdb-entry, Vendor Advisory)
bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-7309?: CVE-2026-7309 is a medium-severity vulnerability in Red Hat Openshift Container Platform 4, classified under Untrusted Search Path. CVSS score: 4.3/10. Published 2026-04-28.
How severe is CVE-2026-7309?: Medium severity. CVSS v3 base score is 4.3 out of 10.