HighCVE-2026-15809

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

Published 15.07.2026Last modified 01.10.2026Sources: Red Hat, CVE.org

What is affected, what to do

A flaw was found in CRI-O. The fix for a previous vulnerability (CVE-2022-4318) was incorrect, allowing it to be bypassed.

Update Red Hat OpenShift Container Platform 4.12 to version 0:1.25.5-36.rhaos4.12.git2e7f657.el8, Red Hat OpenShift Container Platform 4.13 to version 0:1.26.5-32.rhaos4.13.git1088e36.el8, Red Hat OpenShift Container Platform 4.14 to version 0:1.27.8-22.rhaos4.14.git0633bf1.el8.

Affected: Red Hat OpenShift Container Platform 4.12 lt *..0:1.25.5-36.rhaos4.12.git2e7f657.el8
Red Hat OpenShift Container Platform 4.13 lt *..0:1.26.5-32.rhaos4.13.git1088e36.el8
Red Hat OpenShift Container Platform 4.14 lt *..0:1.27.8-22.rhaos4.14.git0633bf1.el8
Red Hat OpenShift Container Platform 4.15 lt *..0:1.28.11-17.rhaos4.15.git48e6ddb.el8
Red Hat OpenShift Container Platform 4.16 lt *..0:1.29.13-14.rhaos4.16.git84cfdc6.el8
Red Hat OpenShift Container Platform 4.17 lt *..0:1.30.14-13.rhaos4.17.git3a25d98.el8
Red Hat OpenShift Container Platform 4.18 lt *..0:1.31.13-14.rhaos4.18.gitf2de9ac.el8
Red Hat OpenShift Container Platform 4.19 lt *..0:1.32.13-11.rhaos4.19.git089e95c.el9
Red Hat OpenShift Container Platform 4.20 lt *..0:1.33.13-5.rhaos4.20.git7ebc848.el9
Red Hat OpenShift Container Platform 4.21 lt *..0:1.34.11-4.rhaos4.21.git358c4b4.el9
Red Hat OpenShift Container Platform 4.22 lt *..0:1.35.6-5.rhaos4.22.git41f610b.el9
Fixed in: Red Hat OpenShift Container Platform 4.12 0:1.25.5-36.rhaos4.12.git2e7f657.el8
Red Hat OpenShift Container Platform 4.13 0:1.26.5-32.rhaos4.13.git1088e36.el8
Red Hat OpenShift Container Platform 4.14 0:1.27.8-22.rhaos4.14.git0633bf1.el8
Red Hat OpenShift Container Platform 4.15 0:1.28.11-17.rhaos4.15.git48e6ddb.el8
Red Hat OpenShift Container Platform 4.16 0:1.29.13-14.rhaos4.16.git84cfdc6.el8
Red Hat OpenShift Container Platform 4.17 0:1.30.14-13.rhaos4.17.git3a25d98.el8
Red Hat OpenShift Container Platform 4.18 0:1.31.13-14.rhaos4.18.gitf2de9ac.el8
Red Hat OpenShift Container Platform 4.19 0:1.32.13-11.rhaos4.19.git089e95c.el9
Red Hat OpenShift Container Platform 4.20 0:1.33.13-5.rhaos4.20.git7ebc848.el9
Red Hat OpenShift Container Platform 4.21 0:1.34.11-4.rhaos4.21.git358c4b4.el9
Red Hat OpenShift Container Platform 4.22 0:1.35.6-5.rhaos4.22.git41f610b.el9

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Metrics

7.8

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

7.8

CVSS v3

Severity High on the scale from 0 to 10.

Source: Red Hat, CVE.org

0.2 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 7.9

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 60.17 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 7.8 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 7.8
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.2 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 7.9; Low — this CVE sits in the lower 10% of all CVEs scored today.
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 15.07.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 15 July 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-134

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

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: redhat_csaf, cvelistv5, NVD (NIST)

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Red Hat	Confidential Compute Attestation	`—`	—
Red Hat	Red Hat OpenShift Container Platform 4	`—`	—
Red Hat	Red Hat OpenShift Container Platform 4.12	`< 0:1.25.5-36.rhaos4.12.git2e7f657.el8`	`0:1.25.5-36.rhaos4.12.git2e7f657.el8`
Red Hat	Red Hat OpenShift Container Platform 4.13	`< 0:1.26.5-32.rhaos4.13.git1088e36.el8`	`0:1.26.5-32.rhaos4.13.git1088e36.el8`
Red Hat	Red Hat OpenShift Container Platform 4.14	`< 0:1.27.8-22.rhaos4.14.git0633bf1.el8`	`0:1.27.8-22.rhaos4.14.git0633bf1.el8`
Red Hat	Red Hat OpenShift Container Platform 4.15	`< 0:1.28.11-17.rhaos4.15.git48e6ddb.el8`	`0:1.28.11-17.rhaos4.15.git48e6ddb.el8`
Red Hat	Red Hat OpenShift Container Platform 4.16	`< 0:1.29.13-14.rhaos4.16.git84cfdc6.el8`	`0:1.29.13-14.rhaos4.16.git84cfdc6.el8`
Red Hat	Red Hat OpenShift Container Platform 4.17	`< 0:1.30.14-13.rhaos4.17.git3a25d98.el8`	`0:1.30.14-13.rhaos4.17.git3a25d98.el8`
Red Hat	Red Hat OpenShift Container Platform 4.18	`< 0:1.31.13-14.rhaos4.18.gitf2de9ac.el8`	`0:1.31.13-14.rhaos4.18.gitf2de9ac.el8`
Red Hat	Red Hat OpenShift Container Platform 4.19	`< 0:1.32.13-11.rhaos4.19.git089e95c.el9`	`0:1.32.13-11.rhaos4.19.git089e95c.el9`
Red Hat	Red Hat OpenShift Container Platform 4.20	`< 0:1.33.13-5.rhaos4.20.git7ebc848.el9`	`0:1.33.13-5.rhaos4.20.git7ebc848.el9`
Red Hat	Red Hat OpenShift Container Platform 4.21	`< 0:1.34.11-4.rhaos4.21.git358c4b4.el9`	`0:1.34.11-4.rhaos4.21.git358c4b4.el9`
Red Hat	Red Hat OpenShift Container Platform 4.22	`< 0:1.35.6-5.rhaos4.22.git41f610b.el9`	`0:1.35.6-5.rhaos4.22.git41f610b.el9`

Vendors and products

Weakness classes (CWE)

CWE-134Use of Externally-Controlled Format String
Base
The product uses a function that accepts a format string as an argument, but the format string originates from an external source.
Entry at MITRE CWE-134

References & sources

access.redhat.comRHSA-2026:57361Vendor advisory, x_refsource_REDHAT
access.redhat.comsecurity/cve/CVE-2026-15809Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2500846Issue tracking, x_refsource_REDHAT
github.comcri-o/cri-o/pull/6450
github.comcri-o/cri-o/pull/6524
access.redhat.comRHSA-2026:60444Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:60449Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:60452Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:62548Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:65906Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:65838Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:66385Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:67836Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:67856Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:70585Vendor advisory, x_refsource_REDHAT

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

01.10.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:70585

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/15xxx/CVE-2026-15809.json">CVE-2026-15809</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:70585

Source identifier: secalert@redhat.com

25.09.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:67856

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/15xxx/CVE-2026-15809.json">CVE-2026-15809</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:67856

Source identifier: secalert@redhat.com

24.09.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:67836

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/15xxx/CVE-2026-15809.json">CVE-2026-15809</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:67836

Source identifier: secalert@redhat.com

17.09.2026Record modifiedRed Hat

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/15xxx/CVE-2026-15809.json">CVE-2026-15809</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:65838
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:66385

Source identifier: secalert@redhat.com

17.09.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:65906

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/15xxx/CVE-2026-15809.json">CVE-2026-15809</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:65906

Source identifier: secalert@redhat.com

Show 4 older changes

10.09.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:62548

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/15xxx/CVE-2026-15809.json">CVE-2026-15809</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:62548

Source identifier: secalert@redhat.com

01.09.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:60449

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/15xxx/CVE-2026-15809.json">CVE-2026-15809</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:60449

Source identifier: secalert@redhat.com

01.09.2026Record modifiedRed Hat

New references:

and 2 more references

Show 12 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/15xxx/CVE-2026-15809.json">CVE-2026-15809</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:57361
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:60444
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-15809
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2500846
Reference	added	—	https://github.com/cri-o/cri-o/pull/6450
Reference	added	—	https://github.com/cri-o/cri-o/pull/6524
Reference	removed	https://access.redhat.com/errata/RHSA-2026:57361	—
Reference	removed	https://access.redhat.com/security/cve/CVE-2026-15809	—
Reference	removed	https://bugzilla.redhat.com/show_bug.cgi?id=2500846	—
Reference	removed	https://github.com/cri-o/cri-o/pull/6450	—
Reference	removed	https://github.com/cri-o/cri-o/pull/6524	—

Source identifier: secalert@redhat.com

25.08.2026Record modifiedRed Hat

New references:

https://access.redhat.com/errata/RHSA-2026:57361

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:57361
Affected versions (publisher)	changed	Confidential Compute Attestation, Red Hat OpenShift Container Platform 4, Red Hat OpenShift Container Platform 4 (+1)	Red Hat OpenShift Container Platform 4.22, Confidential Compute Attestation, Red Hat OpenShift Container Platform 4 (+1)

Source identifier: secalert@redhat.com

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<a href="https://intel.neosec.eu/en/cve/CVE-2026-15809"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-15809.svg?lang=en" alt="CVE-2026-15809 – NEOSEC Intel" height="20"></a>