CVE-2026-15809

HIGH

7.8

CVSS v3

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.

CWE-134 CWE-116

How to fix

Remediation Available

cri-oRed Hat / RHEL

Fixed in:0:1.35.6-5.rhaos4.22.git41f610b.el9RHSA-2026:57361

cri-oRocky

Fixed in:0:1.35.6-5.rhaos4.22.git41f610b.el9RHSA-2026:57361

cri-o-debuginfoRed Hat / RHEL

Fixed in:0:1.35.6-5.rhaos4.22.git41f610b.el9RHSA-2026:57361

cri-o-debuginfoRocky

Fixed in:0:1.35.6-5.rhaos4.22.git41f610b.el9RHSA-2026:57361

cri-o-debugsourceRocky

Fixed in:0:1.35.6-5.rhaos4.22.git41f610b.el9RHSA-2026:57361

cri-o-debugsourceRed Hat / RHEL

Fixed in:0:1.35.6-5.rhaos4.22.git41f610b.el9RHSA-2026:57361

cri-toolsRocky

Fixed in:0:1.35.0-3.el9RHSA-2026:57361

cri-toolsRed Hat / RHEL

Fixed in:0:1.35.0-3.el9RHSA-2026:57361

cri-tools-debuginfoRocky

Fixed in:0:1.35.0-3.el9RHSA-2026:57361

cri-tools-debuginfoRed Hat / RHEL

Fixed in:0:1.35.0-3.el9RHSA-2026:57361

cri-tools-debugsourceRocky

Fixed in:0:1.35.0-3.el9RHSA-2026:57361

cri-tools-debugsourceRed Hat / RHEL

Fixed in:0:1.35.0-3.el9RHSA-2026:57361

kata-containersRed Hat / RHEL

Fixed in:0:3.31.0-5.rhaos4.22.el9RHSA-2026:57361

kata-containersRocky

Fixed in:0:3.31.0-5.rhaos4.22.el9RHSA-2026:57361

openshiftRocky

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el8RHSA-2026:57361

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshiftRed Hat / RHEL

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el8RHSA-2026:57361

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-clientsRocky

Fixed in:0:4.22.0-202608131626.p2.g7ec2e14.assembly.stream.el8RHSA-2026:57361

Fixed in:0:4.22.0-202608131626.p2.g7ec2e14.assembly.stream.el9RHSA-2026:57361

openshift-clientsRed Hat / RHEL

Fixed in:0:4.22.0-202608131626.p2.g7ec2e14.assembly.stream.el8RHSA-2026:57361

Fixed in:0:4.22.0-202608131626.p2.g7ec2e14.assembly.stream.el9RHSA-2026:57361

openshift-clients-redistributableRed Hat / RHEL

Fixed in:0:4.22.0-202608131626.p2.g7ec2e14.assembly.stream.el8RHSA-2026:57361

Fixed in:0:4.22.0-202608131626.p2.g7ec2e14.assembly.stream.el9RHSA-2026:57361

openshift-clients-redistributableRocky

Fixed in:0:4.22.0-202608131626.p2.g7ec2e14.assembly.stream.el8RHSA-2026:57361

Fixed in:0:4.22.0-202608131626.p2.g7ec2e14.assembly.stream.el9RHSA-2026:57361

openshift-hyperkubeRed Hat / RHEL

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el8RHSA-2026:57361

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-hyperkubeRocky

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el8RHSA-2026:57361

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-kube-apiserverRocky

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-kube-apiserverRed Hat / RHEL

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-kube-controller-managerRocky

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-kube-controller-managerRed Hat / RHEL

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-kube-schedulerRocky

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-kube-schedulerRed Hat / RHEL

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-kubeletRocky

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

openshift-kubeletRed Hat / RHEL

Fixed in:0:4.22.0-202608190726.p2.g05744ab.assembly.stream.el9RHSA-2026:57361

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.16%probability of exploitation in 30 days

6thpercentile

Low risk: more likely to be exploited than 6% of all known CVEs.

References

Other references5

Related Vulnerabilities

Other CWE-134 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13160	Critical	9.8	81%	-	Fix
CVE-2023-22374	High	8.5	73%	-	-
CVE-2012-1851	High	10.0	66%	-	-
CVE-2024-23113	Critical	9.8	62%	KEV	-
CVE-2012-3569	High	9.3	48%	-	-
CVE-2019-1579	High	8.1	46%	KEV + Ransom	Fix

Common questions

How do I fix CVE-2026-15809?

Published advisories record a fix for 46 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-15809 being actively exploited?

Not that we know of. CVE-2026-15809 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.16% is the estimated probability that it will be exploited in the next 30 days. That is higher than 6% of all scored CVEs.

How severe is CVE-2026-15809?

CVE-2026-15809 has a CVSS v3 base score of 7.8, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-15809 affect?

Published advisories record a fix for cri-o (Red Hat / RHEL), cri-o (Rocky), cri-o-debuginfo (Red Hat / RHEL), cri-o-debuginfo (Rocky), and 42 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-25.