RHSA-2026:80498
Vulnerability from csaf_redhat - Published: 2026-10-12 03:12 - Updated: 2026-10-12 03:12Summary
Red Hat Security Advisory: flatpak security update
Severity
Important
Notes
Topic: An update for flatpak is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.
Security Fix(es):
* flatpak: Flatpak: Arbitrary code execution via missing symlink protection (CVE-2026-90616)
* flatpak: flatpak: Arbitrary write access as root via extra-data extraction (CVE-2026-96275)
* flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems (CVE-2026-96280)
* flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer (CVE-2026-96808)
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.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in Flatpak. A malicious sandboxed application can exploit missing symlink protection during the creation and bind-mounting of app data directories. By manipulating attacker-controlled path components, a malicious symlink can redirect these directories to arbitrary locations on the host system. This allows the sandboxed application to gain arbitrary read and write access to host files, which can be escalated to arbitrary code execution on the host.
7.8 (High)
Affected products
Fixed
58 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:flatpak-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-10.2.Z:flatpak-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-0:1.16.0-9.el10_2.4.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-debuginfo-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-debuginfo-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-debuginfo-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-debuginfo-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-debugsource-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-debugsource-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-debugsource-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-debugsource-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-libs-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-libs-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-libs-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-libs-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-libs-debuginfo-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-libs-debuginfo-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-libs-debuginfo-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-libs-debuginfo-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-selinux-0:1.16.0-9.el10_2.4.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-session-helper-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-session-helper-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-session-helper-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-session-helper-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-session-helper-debuginfo-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-session-helper-debuginfo-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-session-helper-debuginfo-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-session-helper-debuginfo-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-tests-debuginfo-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-tests-debuginfo-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-tests-debuginfo-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:flatpak-tests-debuginfo-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-debuginfo-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-debuginfo-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-debuginfo-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-debuginfo-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-debugsource-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-debugsource-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-debugsource-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-debugsource-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-devel-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-devel-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-devel-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-devel-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-libs-debuginfo-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-libs-debuginfo-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-libs-debuginfo-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-libs-debuginfo-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-session-helper-debuginfo-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-session-helper-debuginfo-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-session-helper-debuginfo-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-session-helper-debuginfo-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-tests-debuginfo-0:1.16.0-9.el10_2.4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-tests-debuginfo-0:1.16.0-9.el10_2.4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-tests-debuginfo-0:1.16.0-9.el10_2.4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-10.2.Z:flatpak-tests-debuginfo-0:1.16.0-9.el10_2.4.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
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.
8.8 (High)
Affected products
Fixed
58 products, the same list as for
CVE-2026-90616
Threats
Impact
Important
The OCI delta stream parser read sizes as guint64 but passed them to GLib I/O and allocation functions expecting gsize (32 bits on 32-bit systems), causing undersized allocations while subsequent operations use the original 64-bit size, leading to heap buffer overflows. An attacker controlling an OCI registry can craft a delta stream that triggers this during flatpak install/update, potentially achieving code execution on 32-bit systems.
7.5 (High)
Affected products
Fixed
58 products, the same list as for
CVE-2026-90616
Threats
Impact
Moderate
A flaw was found in Flatpak. A malicious local user in an active local session could exploit a symlink traversal vulnerability in the `revokefs` writer. This flaw allows an attacker to modify files belonging to a different `revokefs` session after they have been validated. Consequently, an attacker could tamper with `ostree` commit objects, leading to root-controlled file writes and local root privilege escalation.
7.8 (High)
Affected products
Fixed
58 products, the same list as for
CVE-2026-90616
Threats
Impact
Important
References
28 references
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"name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
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"text": "A flaw was found in Flatpak. A malicious sandboxed application can exploit missing symlink protection during the creation and bind-mounting of app data directories. By manipulating attacker-controlled path components, a malicious symlink can redirect these directories to arbitrary locations on the host system. This allows the sandboxed application to gain arbitrary read and write access to host files, which can be escalated to arbitrary code execution on the host.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "flatpak: Flatpak: Arbitrary code execution via missing symlink protection",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"category": "external",
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"url": "https://www.openwall.com/lists/oss-security/2026/08/11/9"
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "flatpak: Flatpak: Arbitrary code execution via missing symlink protection"
},
{
"acknowledgments": [
{
"names": [
"Sebastian Wick"
],
"summary": "Acknowledged by upstream."
}
],
"cve": "CVE-2026-96275",
"cwe": {
"id": "CWE-22",
"name": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)"
},
"discovery_date": "2026-08-11T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2539416"
}
],
"notes": [
{
"category": "description",
"text": "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.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "flatpak: flatpak: Arbitrary write access as root via extra-data extraction",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat estimates the CVSSv3.1 vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.\n\nExploitation requires a user or administrator to add or trust a malicious or compromised Flatpak repository and then install or update an application from it. The malicious content is served over the network (AV:N), and the attacker needs only control over the repository content (PR:N). Once the client pulls from that repository, exploitation is deterministic and requires no race condition or additional preconditions: extract_extra_data() resolves files/extra inside the checked-out commit tree using path operations that follow symlinks, so a files entry that is itself a symlink (e.g., files -\u003e /tmp) redirects the write; separately, the blob name taken from xa.extra-data-sources is not sanitized against .. traversal, allowing it to escape the extra/ directory (AC:L). Meaningful user interaction is required, since a user/admin must actively configure the remote and initiate an install or update from it (UI:R).\n\nOn system-wide installs, this extraction runs via the privileged system-helper, so the write happens as root (S:U reflects that the vulnerable and impacted components remain within the same overall flatpak client/helper security authority, which by design already operates with root privileges for system installs). Because this is an unconstrained, attacker-controlled write as root, it is treated as equivalent to full system compromise: an attacker can overwrite files such as SSH authorized_keys, systemd units, cron entries, or setuid binaries, yielding full loss of confidentiality, integrity, and availability (C:H/I:H/A:H).",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-96275"
},
{
"category": "external",
"summary": "RHBZ#2539416",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2539416"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-96275",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-96275"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-96275",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96275"
},
{
"category": "external",
"summary": "https://github.com/flatpak/flatpak/security/advisories/GHSA-fqx6-vh4p-42cg",
"url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-fqx6-vh4p-42cg"
}
],
"release_date": "2026-08-11T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-12T03:12:32+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"url": "https://access.redhat.com/errata/RHSA-2026:80498"
},
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"category": "workaround",
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"cvss_v3": {
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "flatpak: flatpak: Arbitrary write access as root via extra-data extraction"
},
{
"acknowledgments": [
{
"names": [
"Sebastian Wick"
],
"summary": "Acknowledged by upstream."
}
],
"cve": "CVE-2026-96280",
"cwe": {
"id": "CWE-197",
"name": "Numeric Truncation Error"
},
"discovery_date": "2026-08-11T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2539419"
}
],
"notes": [
{
"category": "description",
"text": "The OCI delta stream parser read sizes as guint64 but passed them to GLib I/O and allocation functions expecting gsize (32 bits on 32-bit systems), causing undersized allocations while subsequent operations use the original 64-bit size, leading to heap buffer overflows. An attacker controlling an OCI registry can craft a delta stream that triggers this during flatpak install/update, potentially achieving code execution on 32-bit systems.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat estimates the CVSSv3.1 vector of CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.\n\nThe malicious stream is served over the network (AV:N), and the attacker needs only control over the OCI registry content (PR:N). The OCI delta stream parser reads sizes as a 64-bit guint64 but passes them to GLib I/O and allocation functions expecting gsize; on 32-bit systems gsize is only 32 bits wide, so the value is silently truncated, producing an undersized allocation while later operations still use the original 64-bit size, leading to a heap buffer overflow. This overflow only manifests on 32-bit targets \u2014 on 64-bit systems gsize and guint64 are the same width and truncation does not occur, so exploitability depends on a target configuration outside the attacker\u0027s control (AC:H). Meaningful user interaction is required (UI:R).\n\nThe vulnerable and impacted components remain within the same flatpak client/helper security authority (S:U). Because this is a heap buffer overflow with a stated path to code execution in the Flatpak client process, a successful exploit is treated as a full compromise of that process\u0027s privileges (C:H/I:H/A:H).",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-96280"
},
{
"category": "external",
"summary": "RHBZ#2539419",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2539419"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-96280",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-96280"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-96280",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96280"
},
{
"category": "external",
"summary": "https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc",
"url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-jr92-2v97-wgvc"
}
],
"release_date": "2026-08-11T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-12T03:12:32+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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{
"category": "impact",
"details": "Moderate"
}
],
"title": "flatpak: flatpak: Buffer overflow in OCI delta stream path names on 32-bit systems"
},
{
"cve": "CVE-2026-96808",
"cwe": {
"id": "CWE-59",
"name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
},
"discovery_date": "2026-09-23T17:21:01.322306+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2539569"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Flatpak. A malicious local user in an active local session could exploit a symlink traversal vulnerability in the `revokefs` writer. This flaw allows an attacker to modify files belonging to a different `revokefs` session after they have been validated. Consequently, an attacker could tamper with `ostree` commit objects, leading to root-controlled file writes and local root privilege escalation.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-96808"
},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2539569"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-96808",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-96808"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-96808",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96808"
},
{
"category": "external",
"summary": "https://github.com/flatpak/flatpak/security/advisories/GHSA-qrwq-7qwx-q9rp",
"url": "https://github.com/flatpak/flatpak/security/advisories/GHSA-qrwq-7qwx-q9rp"
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"release_date": "2026-09-23T16:58:37.139000+00:00",
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"category": "vendor_fix",
"date": "2026-10-12T03:12:32+00:00",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "flatpak: Flatpak: Local privilege escalation via symlink traversal in revokefs writer"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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