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CVE-2026-15809— Github.com/cri-o/cri-o: fix bypass for cve-2022-4318 — /etc/passwd injection via home env

Quick assessment

Affected
Red Hat Red Hat OpenShift Container Platform 4.12
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CRI-O是CRI-O组织开源的一款用于Kubernetes系统的轻量级容器运行时环境。 CRI-O存在输出处理不当漏洞，该漏洞源于针对先前漏洞CVE-2022-4318的修复不正确，导致其被绕过。攻击者能够设置容器上的环境变量，向HOME环境变量注入换行符，通过使用特制的环境变量向/etc/passwd添加任意行。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 11

VendorProduct Version RangeStatus
Red Hat Confidential Compute Attestation any affected
Red Hat Red Hat OpenShift Container Platform 4 any affected
any affected
Red Hat Red Hat OpenShift Container Platform 4.12 0:1.25.5-36.rhaos4.12.git2e7f657.el8< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.13 0:1.26.5-32.rhaos4.13.git1088e36.el8< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.16 0:1.29.13-14.rhaos4.16.git84cfdc6.el8< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.18 0:1.31.13-14.rhaos4.18.gitf2de9ac.el8< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.19 0:1.32.13-11.rhaos4.19.git089e95c.el9< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.20 0:1.33.13-5.rhaos4.20.git7ebc848.el9< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.21 0:1.34.11-4.rhaos4.21.git358c4b4.el9< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.22 0:1.35.6-5.rhaos4.22.git41f610b.el9< * unaffected
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I. Basic Information for CVE-2026-15809

Vulnerability Information
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Vulnerability Title
Github.com/cri-o/cri-o: fix bypass for cve-2022-4318 — /etc/passwd injection via home env
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部控制的格式字符串
Source: CVE Program / CVE List V5
Vulnerability Title
CRI-O 输出处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CRI-O是CRI-O组织开源的一款用于Kubernetes系统的轻量级容器运行时环境。 CRI-O存在输出处理不当漏洞，该漏洞源于针对先前漏洞CVE-2022-4318的修复不正确，导致其被绕过。攻击者能够设置容器上的环境变量，向HOME环境变量注入换行符，通过使用特制的环境变量向/etc/passwd添加任意行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat OpenShift Container Platform 4.12 0:1.25.5-36.rhaos4.12.git2e7f657.el8 ~ * cpe:/a:redhat:openshift:4.12::el8
Red Hat Red Hat OpenShift Container Platform 4.13 0:1.26.5-32.rhaos4.13.git1088e36.el8 ~ * cpe:/a:redhat:openshift:4.13::el8
Red Hat Red Hat OpenShift Container Platform 4.16 0:1.29.13-14.rhaos4.16.git84cfdc6.el8 ~ * cpe:/a:redhat:openshift:4.16::el8
Red Hat Red Hat OpenShift Container Platform 4.18 0:1.31.13-14.rhaos4.18.gitf2de9ac.el8 ~ * cpe:/a:redhat:openshift:4.18::el8
Red Hat Red Hat OpenShift Container Platform 4.19 0:1.32.13-11.rhaos4.19.git089e95c.el9 ~ * cpe:/a:redhat:openshift:4.19::el9
Red Hat Red Hat OpenShift Container Platform 4.20 0:1.33.13-5.rhaos4.20.git7ebc848.el9 ~ * cpe:/a:redhat:openshift:4.20::el8
Red Hat Red Hat OpenShift Container Platform 4.21 0:1.34.11-4.rhaos4.21.git358c4b4.el9 ~ * cpe:/a:redhat:openshift:4.21::el9
Red Hat Red Hat OpenShift Container Platform 4.22 0:1.35.6-5.rhaos4.22.git41f610b.el9 ~ * cpe:/a:redhat:openshift:4.22::el8
Red Hat Confidential Compute Attestation - cpe:/a:redhat:confidential_compute_attestation:1
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-15809

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9654 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-15809

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Patches & Fixes for CVE-2026-15809 (2)

Vendor Advisories for CVE-2026-15809 (11)

Same Patch Batch · Red Hat · 2026-07-15 · 4 CVEs total

CVE-2026-12382 8.2 HIGH Aap-gateway: missing requestheaderstoremove allows mtls bypass via subject header spoofing
CVE-2026-14251 7.7 HIGH Gitops-operator: gitops-operator: missing allowednamespace check in reconcilerhook for clu
CVE-2026-15779 6.1 MEDIUM Samba-winbind: samba: pam_winbind mkhomedir chowns critical system paths without validatio

IV. Related Vulnerabilities

Same product: Red Hat OpenShift Container Platform 4.12
Same vendor: Red Hat
Same weakness: CWE-134

V. Comments for CVE-2026-15809

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