CVE-2026-96275

Description

A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host filesystem via extract_extra_data(). On system installs, the write happens as root. Two issues combine: `files/extra` is resolved via path operations that follow symlinks, and blob names from `xa.extra-data-sources` are not sanitized against `..` traversal.

Overview

State: PUBLISHED
Assigner (CNA): redhat
CVSS severity: HIGH
CVSS score: 8.8 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Effective score: 8.8 / 10 HIGH source: CNA overview
CWE(s): CWE-22
Reserved: 2026-09-22
Published: 2026-09-23 15:01 UTC
Last updated: 2026-09-23 16:08 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/96xxx/CVE-2026-96275.json
Linked Threat: CVE-2026-96275 — Flatpak: flatpak: arbitrary write access as root via extra-data extraction

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-23 15:17:32 UTC
NVD last modified: 2026-09-23 19:40:10 UTC
NVD CVSS v3.1: 8.8 / 10 HIGH source: secalert@redhat.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Exploitability subscore: 2.8 / 10
Impact subscore: 5.9 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-85342
Assigner: redhat
Published: Sep 23, 2026, 3:01:38 PM
Updated: Sep 23, 2026, 4:08:11 PM
EUVD base score (CVSS 3.1): 8.8 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EUVD-reported EPSS: 0.0000

ENISA description: A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host filesystem via extract_extra_data(). On system installs, the write happens as root. Two issues combine: `files/extra` is resolved via path operations that follow symlinks, and blob names from `xa.extra-data-sources` are not sanitized against `..` traversal.

EUVD references (3)

Affected products (4)

Vendor	Product	Versions	Platforms
Red Hat	Red Hat Enterprise Linux 10	—	—
Red Hat	Red Hat Enterprise Linux 7	—	—
Red Hat	Red Hat Enterprise Linux 8	—	—
Red Hat	Red Hat Enterprise Linux 9	—	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

https://access.redhat.com/security/cve/CVE-2026-96275 vdb-entryx_refsource_REDHAT
RHBZ#2539416 issue-trackingx_refsource_REDHAT
https://github.com/flatpak/flatpak/security/advisories/GHSA-fqx6-vh4p-42cg

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://access.redhat.com/security/cve/CVE-2026-96275 secalert@redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2539416 secalert@redhat.com
https://github.com/flatpak/flatpak/security/advisories/GHSA-fqx6-vh4p-42cg secalert@redhat.com

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-96275 - Red Hat Customer Portal

web:access.redhat.com

Overall, you have the following options: Upgrade to a supported product version that includes a fix for this vulnerability (recommended). Apply a mitigation (if one exists). Customers with the Technical Account Manager (TAM) RHEL Security Select Add-on can review this CVE directly with their TAM.

2026-09-24 11:08 UTC
Security Updates - Red Hat Customer Portal

web:access.redhat.com

Products & tools Red Hat Documentation Find answers, get guidance, and learn how to use Red Hat products. Red Hat Ecosystem Catalog Find hardware, software, and cloud providers―and download container images―certified to perform with Red Hat technologies.

2026-09-24 11:08 UTC
July 2026 Critical Patch Update Released | security - Oracle Blogs

web:blogs.oracle.com

For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

2026-09-24 11:08 UTC
Security Update Guide - Microsoft Security Response Center

web:portal.msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-09-24 11:08 UTC
Description of the security update for Office 2016: August 11, 2026 ...

web:support.microsoft.com

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2016. It doesn't apply to the Office 2016 Click-to-Run editions, such as Microsoft Office 365 Home. (See What version of Office am I using?) How to get and install the update Method 1: Microsoft Update This update is available from Microsoft Update. When you turn on ...

2026-09-24 11:08 UTC
CVE-2026-96275 | Ubuntu

web:ubuntu.com

Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things.

2026-09-24 11:08 UTC
Oracle's first monthly patch release fixes 35 flaws, including 11 rated ...

web:www.csoonline.com

Oracle has released the first security fixes in its new monthly Critical Security Patch Update (CSPU) cycle, designed to address urgent vulnerabilities that can't wait for the company's ...

2026-09-24 11:08 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-24 11:08 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-24 11:08 UTC
CVE-2026-96275: Red Hat: A malicious or compromised Flatpak ... - Rapid7

web:www.rapid7.com

CVE-2026-96275 : Red Hat: A malicious or compromised Flatpak repository can write attacker-controlled content to arbitrary locations on the host…. View severity, references, and remediation details from Rapid7.

2026-09-24 11:08 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-96275.json.

{
  "containers": {
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        {
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          "cpes": [
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          ],
          "defaultStatus": "affected",
          "packageName": "flatpak",
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          "vendor": "Red Hat"
        },
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          "cpes": [
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          "vendor": "Red Hat"
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          "cpes": [
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          "defaultStatus": "affected",
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          "product": "Red Hat Enterprise Linux 8",
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          "cpes": [
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      "credits": [
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            "confidentialityImpact": "HIGH",
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            "userInteraction": "REQUIRED",
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      "providerMetadata": {
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        },
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          "time": "2026-08-11T00:00:00.000Z",
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        }
      ],
      "title": "Flatpak: flatpak: arbitrary write access as root via extra-data extraction",
      "workarounds": [
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          "lang": "en",
          "value": "Avoid installing Flatpak extensions from non-trusted sources."
        }
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    "dateReserved": "2026-09-22T20:42:17.038Z",
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