HighCVE-2026-75569

Mce-operator-bundle: all github actions pinned by mutable tag, not commit sha (CVE-2026-75569)

Published 19.08.2026Last modified 26.10.2026Sources: CVE.org

What is affected, what to do

A flaw was found in mce-operator-bundle. The build process fetches and executes scripts from a remote repository without performing integrity checks, such as commit pinning or signature verification.

Update Red Hat multicluster engine for Kubernetes 2.10 to version 1787263075, Red Hat multicluster engine for Kubernetes 2.11 to version 1787321579, Red Hat multicluster engine for Kubernetes 2.17 to version 1787083639.

Affected: Red Hat multicluster engine for Kubernetes 2.10 lt *..1787263075
Red Hat multicluster engine for Kubernetes 2.11 lt *..1787321579
Red Hat multicluster engine for Kubernetes 2.17 lt *..1787083639
Red Hat multicluster engine for Kubernetes 2.6 lt *..1787317415
Red Hat multicluster engine for Kubernetes 2.8 lt *..1787318262
Red Hat multicluster engine for Kubernetes 2.9 lt *..1787287150
Fixed in: Red Hat multicluster engine for Kubernetes 2.10 1787263075
Red Hat multicluster engine for Kubernetes 2.11 1787321579
Red Hat multicluster engine for Kubernetes 2.17 1787083639
Red Hat multicluster engine for Kubernetes 2.6 1787317415
Red Hat multicluster engine for Kubernetes 2.8 1787318262
Red Hat multicluster engine for Kubernetes 2.9 1787287150

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Metrics

7.7

Priority

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

Source: NVD, CVSS v3

7.7

CVSS v3

Severity High on the scale from 0 to 10.

Source: CVE.org

0.6 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 48.4

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: 81.09 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: 7.7 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: 7.7
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: 0.6 %; 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: 48.4; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
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: 19.08.2026
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-1357

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 mce-operator-bundle. The build process fetches and executes scripts from a remote repository without performing integrity checks, such as commit pinning or signature verification. This allows a malicious actor with write access to the remote repository to inject and execute arbitrary code during the build. The consequence is a compromised build process, potentially leading to the distribution of malicious software.

Source: NVD (NIST), cvelistv5

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	multicluster engine for Kubernetes 2.10	`< 1787263075`	`1787263075`
Red Hat	multicluster engine for Kubernetes 2.11	`< 1787321579`	`1787321579`
Red Hat	multicluster engine for Kubernetes 2.17	`< 1787083639`	`1787083639`
Red Hat	multicluster engine for Kubernetes 2.6	`< 1787317415`	`1787317415`
Red Hat	multicluster engine for Kubernetes 2.8	`< 1787318262`	`1787318262`
Red Hat	multicluster engine for Kubernetes 2.9	`< 1787287150`	`1787287150`

Vendors and products

Weakness classes (CWE)

CWE-1357Reliance on Insufficiently Trustworthy Component
Class
The product is built from multiple separate components, but it uses a component that is not sufficiently trusted to meet expectations for security, reliability, updateability, and maintainability.
Entry at MITRE CWE-1357

References & sources

access.redhat.comsecurity/cve/CVE-2026-75569Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2519849Issue tracking, x_refsource_REDHAT
access.redhat.comRHSA-2026:59634Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:59636Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:59638Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:59642Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:59643Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:59637Vendor 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).

29.09.2026Record modifiedRed Hat

1 individual change: Affected versions (publisher)

Show the original change

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/2026/75xxx/CVE-2026-75569.json">CVE-2026-75569</a>

Source identifier: secalert@redhat.com

08.09.2026Record modifiedRed Hat

1 individual change: Affected versions (publisher)

Show the original change

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/2026/75xxx/CVE-2026-75569.json">CVE-2026-75569</a>

Source identifier: secalert@redhat.com

08.09.2026Record modifiedRed Hat

1 individual change: Affected versions (publisher)

Show the original change

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/2026/75xxx/CVE-2026-75569.json">CVE-2026-75569</a>

Source identifier: secalert@redhat.com

07.09.2026Record modifiedRed Hat

1 individual change: Affected versions (publisher)

Show the original change

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/2026/75xxx/CVE-2026-75569.json">CVE-2026-75569</a>

Source identifier: secalert@redhat.com

07.09.2026Record modifiedRed Hat

1 individual change: Affected versions (publisher)

Show the original change

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/2026/75xxx/CVE-2026-75569.json">CVE-2026-75569</a>

Source identifier: secalert@redhat.com

Show 5 older changes

06.09.2026Record modifiedRed Hat

1 individual change: Affected versions (publisher)

Show the original change

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/2026/75xxx/CVE-2026-75569.json">CVE-2026-75569</a>

Source identifier: secalert@redhat.com

02.09.2026Record modifiedRed Hat
Weakness type: CWE-1357
Show 2 original changes
Individual changes of this event as published by NVD
Type Action Before After
Weakness type (CWE) added
—
CWE-1357
Weakness type (CWE) removed
CWE-829
—
Source identifier: secalert@redhat.com

Individual changes of this event as published by NVD
Type	Action	Before	After
Weakness type (CWE)	added	—	CWE-1357
Weakness type (CWE)	removed	CWE-829	—

25.08.2026Record modifiedRed Hat

New references:

and 1 more reference

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59634
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59636
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59638
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59642
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:59643
Affected versions (publisher)	changed	Multicluster Engine for Kubernetes	multicluster engine for Kubernetes 2.11, multicluster engine for Kubernetes 2.17, multicluster engine for Kubernetes 2.6 (+2)

Source identifier: secalert@redhat.com

20.08.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: no

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"id":"CVE-2026-75569","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-20T14:00:29.833872Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

19.08.2026ReceivedRed Hat

CVSS V3.1: AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N

Weakness type: CWE-829

Description added or changed

New references:

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Multicluster Engine for Kubernetes
Description	added	—	A flaw was found in mce-operator-bundle. The build process fetches and executes scripts from a remote repository without performing integrity checks, such as commit pinning or signature verification. This allows a malicious actor with write access to the remote repository to inject and execute arbitrary code during the build. The consequence is a compromised build process, potentially leading to the distribution of malicious software.
CVSS	added	—	AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
Weakness type (CWE)	added	—	CWE-829
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-75569
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2519849

Source identifier: secalert@redhat.com

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