CVE-2026-41326VulnerabilityPublished 17 Jun 2026Updated 1 Nov 2026

Red Hat Security Advisory: OpenShift Container Platform 4.19.34 bug fix and security update

Affects Red HatSource GCVE Database

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Mentioned vulnerabilities

CVE-2026-43037

Not known to be exploited : upgrade Red Hat to 4.19.34 as a priority.

Data as of 1 Nov 2026, 05:21 UTC

Severity

Critical

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 4.19.34

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Red Hat to 4.19.34.

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=4.19.0 <4.19.34 Red Hat Red Hat OpenShift Enterprise Red Hat OpenShift Container Platform 4.19 aarch64 rhcos-aarch64-4.19.9.6.202606100451-0	Fixed in 4.19.34

AI-suggested

A fix is available in Red Hat OpenShift Container Platform 4.19.34, which includes updated container images and RPM packages addressing these vulnerabilities. Users should upgrade their OpenShift clusters to version 4.19.34 using the OpenShift CLI (oc) or web console as soon as the update is available in their release channel. Detailed upgrade instructions are provided by Red Hat at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli. No additional mitigations are specified beyond applying this update.

Description

Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the container images for Red Hat OpenShift Container Platform 4.19.34. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHBA-2026:25199 Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes: https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html/release_notes/ Security Fix(es): * kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037) * kata-containers: Arbitrary file write inside guest image via CopyFile policy (CVE-2026-41326) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/html-single/updating_clusters/index#updating-cluster-cli.

Impact

The vulnerabilities have been rated critical by Red Hat Product Security. CVE-2026-41326 could allow an attacker to perform arbitrary file writes inside the guest image of kata-containers, potentially compromising container integrity or security. CVE-2026-43037 affects the kernel's ip6_tunnel functionality and may lead to security issues related to improper handling of packet buffers. These vulnerabilities impact Red Hat OpenShift Container Platform 4.19 deployments on multiple architectures including x86_64, s390x, ppc64le, and aarch64. No known exploits in the wild have been reported at this time.

Summary

This advisory for Red Hat OpenShift Container Platform 4.19.34 addresses two critical security vulnerabilities. CVE-2026-41326 involves an arbitrary file write vulnerability inside the guest image of kata-containers through the CopyFile policy, potentially allowing unauthorized modification of files. CVE-2026-43037 is a kernel vulnerability related to the ip6_tunnel component where skb2->cb[] is not cleared in ip4ip6_err(), which could lead to security issues. The update includes fixed container images and RPM packages to resolve these vulnerabilities. The advisory recommends upgrading to the 4.19.34 release to apply these fixes.

CWE-1220Insufficient Granularity of Access Control (opens in a new tab)
Base weakness
The product implements access controls via a policy or other feature with the intention to disable or restrict accesses (reads and/or writes) to assets in a system from untrusted agents. However, implemented access controls lack the required granularity
Architecture and Design · Implementation · Testing
Access-control-policy protections must be reviewed for design inconsistency and common weaknesses.; Access-control-policy definition and programming flow must be tested in pre-silicon, post-silicon testing.
OWASP Cheat Sheets
Docker Security (opens in a new tab)
Third Party Javascript Management (opens in a new tab)
Virtual Patching (opens in a new tab)
OWASP ASVS 4.0.3
V1.4.4 (opens in a new tab)
V1.4.5 (opens in a new tab)
V1.10.1 (opens in a new tab)
Attack patterns
Accessing Functionality Not Properly Constrained by ACLs (opens in a new tab)
Exploiting Incorrectly Configured Access Control Security Levels (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-843Access of Resource Using Incompatible Type (Type Confusion) (opens in a new tab)
Base weakness
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 11 Aug 2026, 20:34 UTC

WeaknessesCWE-1220, CWE-843

Technical details

References

Community reviews

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