What is the CVSS score of CVE-2026-86836?

CVE-2026-86836 has a CVSS 4.0 base score of 8.4 (High). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:H. EPSS exploitation probability: 0.1%.

Eclipse Ankaios CVE-2026-86836

EUVD-2026-77703 HIGH

Creation of Temporary File in Directory with Insecure Permissions (CWE-379)

2026-09-14 eclipse

GHSA-x544-76qg-7v6p

Authentication Bypass Eclipse Ankaios Eclipse Foundation

8.4

CVSS 4.0 · Vendor: eclipse

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Vulnerability Assessment

Weakness

CWE

CWE-379

OWASP Top 10:2025

A01:2025 - Broken Access Control

ASVS 5.0

V5 - File Handling Temp file permissions

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 16, 2026

A local unprivileged user can hijack the Control Interface of another workload in Eclipse Ankaios 0.1.0 through 1.0.2 by pre-creating the agent's predictable run-folder path hierarchy and Control Interface FIFOs under the shared default location $TMPDIR/ankaios. Because the agent reuses an existing directory or FIFO based only on an existence/file-type check — without verifying ownership or permissions — it treats the attacker-owned pipes as the legitimate Control Interface and executes requests under that workload's configured controlInterfaceAccess permissions, enabling workload impersonation and unauthorized reading or modification of the cluster's desired state. The flaw is CWE-379 (insecure temporary file/permissions), carries a CVSS 4.0 base score of 8.4 (AV:L/PR:L/AT:P, high confidentiality and integrity impact), and has no public exploit code or CISA KEV listing at time of analysis; EPSS is 0.09%, consistent with a local, non-automatable attack. The vendor released v1.0.3 with an ownership/permission validation check (PR #799).

Affected VersionsENISA

Eclipse Ankaios 0.1.0 ≤1.0.2

Affected Packages

euvd eclipse_ankaios no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (eclipse) PRIMARY 8.4 HIGH

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:H

Primary rating from Vendor (eclipse) · only source for this CVE.

CVSS VectorVendor: eclipse

Attack Vector

Local

Attack Complexity

Low

Attack Requirements

Present

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

None

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

High

DescriptionCVE.org

In Eclipse Ankaios versions 0.1.0 through 1.0.2, the agent creates workload files and Control Interface named pipes (FIFOs) under a predictable path derived from the agent name and a hash of the workload's runtime configuration. If a directory or FIFO already exists at that path when the agent (re)starts, the agent reuses it based only on an existence and/or file-type check, without validating its owner or permissions. A local, unprivileged user with write access to the same base directory (by default under $TMPDIR/ankaios, e.g. shared /tmp) can pre-create this path hierarchy, including the two Control Interface FIFOs, before the agent starts. The agent then treats the attacker-owned FIFOs as the legitimate Control Interface for the targeted workload. The attacker can complete the Control Interface handshake and issue requests using that workload's configured controlInterfaceAccess permissions, allowing impersonation of the workload and, depending on its configured permissions, unauthorized reading and/or modification of the cluster's desired state.

Threat Intelligence Overview

EPSS Score

0.1%

Top 100% exploitable

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.