Y2Y2
Explore more on Y2
Public vulnerability disclosure
Investigate in Cyber
Open

CVE-2026-15809

Github.com/cri-o/cri-o: fix bypass for cve-2022-4318 — /etc/passwd injection via home env

publishedCWE-134CWE-116

A flaw was found in CRI-O. The fix for a previous vulnerability (CVE-2022-4318) was incorrect, allowing it to be bypassed. An attacker capable of setting environment variables on a container can inject a newline character into the HOME environment variable. This issue allows the addition of arbitrary lines into /etc/passwd by use of a specially crafted environment variable.

Technical severity7.8 highCVSS 3.1 · CNA: redhat
Published2026-07-15Source updated 2026-11-02
Collected2026-11-022 attributed sources

Fixes and workarounds

Workaround

Restrict access to users who can create or modify container workloads through appropriate RBAC permissions, apply security controls such as Security Context Constraints (SCCs) to limit privilege escalation, and enforce policies to run containers with reduced privileges (for example, as non-root) to reduce the impact of potential exploitation. Enable SELinux on affected nodes and consider admission controls to prevent potentially unsafe workload configurations.

Source: CNA: redhat

Affected products and versions

ProductVersionsAuthority
Red Hat OpenShift Container Platform 4.12
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.25.5-36.rhaos4.12.git2e7f657.el8; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.13
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.26.5-32.rhaos4.13.git1088e36.el8; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.14
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.27.8-22.rhaos4.14.git0633bf1.el8; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.15
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.28.11-17.rhaos4.15.git48e6ddb.el8; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.16
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.29.13-14.rhaos4.16.git84cfdc6.el8; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.17
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.30.14-13.rhaos4.17.git3a25d98.el8; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.18
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.31.13-14.rhaos4.18.gitf2de9ac.el8; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.19
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.32.13-11.rhaos4.19.git089e95c.el9; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.20
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.33.13-5.rhaos4.20.git7ebc848.el9; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.21
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.34.11-4.rhaos4.21.git358c4b4.el9; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4.22
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:1.35.6-5.rhaos4.22.git41f610b.el9; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Confidential Compute Attestation
Red Hat
openshift-sandboxed-containers/osc-monitor-rhel9
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4
Red Hat
openshift4/cnf-tests-rhel8
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 4
Red Hat
openshift4/ztp-site-generate-rhel8
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: affected 		CNA: redhat
Red Hat OpenShift Container Platform 5
Red Hat
cri-o
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: affected 		CNA: redhat

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

CVSS assessments

Version / scoreVectorAuthority
3.1 / 7.8
high		 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCNA: redhat

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

For agents and automation

Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.

Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.

Get an API keyUse x402Connect an agent
Endpoints and access details

https://api.y2.dev/api/v2/cyber/cves
https://api.y2.dev/api/v2/cyber/cves/{cveId}

A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.

For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.

Agent access JSON · OpenAPI · CVE API guide