Vulnerability-Lookup

RHSA-2026:80687

Vulnerability from csaf_opensuse - Published: 2026-10-12 00:00 - Updated: 2026-10-13 09:43

Summary

security update for flatpak

Severity

Important

Notes

Title of the patch: security update for flatpak

Description of the patch: This security update provides a functional equivalent of RHSA-2026:80687. The original Red Hat(R) advisory is available from the Red Hat web site at https://access.redhat.com/errata/RHSA-2026:80687.

Patchnames: RHSA-2026:80687

CVE-2026-90616

8.8 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Recommended 9 products

Product	Version	Remediation
Unresolved product id: SUSE Liberty Linux 8:flatpak-0:1.12.9-7.el8_10.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-0:1.12.9-7.el8_10.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-devel-0:1.12.9-7.el8_10.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-devel-0:1.12.9-7.el8_10.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-libs-0:1.12.9-7.el8_10.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-libs-0:1.12.9-7.el8_10.x86_64	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-selinux-0:1.12.9-7.el8_10.noarch	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-session-helper-0:1.12.9-7.el8_10.i686	—	Vendor Fix
Unresolved product id: SUSE Liberty Linux 8:flatpak-session-helper-0:1.12.9-7.el8_10.x86_64	—	Vendor Fix

Threats

Impact important

CVE-2026-96275

8.8 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Recommended 9 products, the same list as for CVE-2026-90616

Threats

Impact important

CVE-2026-96280

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Recommended 9 products, the same list as for CVE-2026-90616

Threats

Impact important

CVE-2026-96808

7 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Recommended 9 products, the same list as for CVE-2026-90616

Threats

Impact important

References

14 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/r…	self
https://www.suse.com/security/cve/CVE-2026-90616/	self
https://www.suse.com/security/cve/CVE-2026-96275/	self
https://www.suse.com/security/cve/CVE-2026-96280/	self
https://www.suse.com/security/cve/CVE-2026-96808/	self
https://www.suse.com/security/cve/CVE-2026-90616	external
https://bugzilla.suse.com/1280236	external
https://www.suse.com/security/cve/CVE-2026-96275	external
https://bugzilla.suse.com/1282515	external
https://www.suse.com/security/cve/CVE-2026-96280	external
https://bugzilla.suse.com/1282518	external
https://www.suse.com/security/cve/CVE-2026-96808	external
https://bugzilla.suse.com/1282524	external

JSON

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  "vulnerabilities": [
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        {
          "category": "general",
          "text": "In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, which can be escalated to arbitrary code execution on the host, a different vulnerability than CVE-2026-76925. Flatpak creates a few app data directories (e.g., /var/cache, /var/data, /var/config, and /var/tmp) in every sandbox on every app launch where, in some cases, components of the path are attacker-controlled. Missing symlink protection can redirect the directories. Some of these directories are bind-mounted by Flatpak by passing the path (e.g., /home/user/.var/app/APP_ID/cache/tmp), which contains attacker-controlled directories (tmp) to bwrap --bind SRC DST. bwrap passes the path on to the kernel, which then follows symlinks. A malicious symlink can point to arbitrary locations on the host and it will become mounted inside the sandbox.",
          "title": "CVE description"
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        {
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      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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      "scores": [
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          "cvss_v3": {
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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            "SUSE Liberty Linux 8:flatpak-libs-0:1.12.9-7.el8_10.x86_64",
            "SUSE Liberty Linux 8:flatpak-selinux-0:1.12.9-7.el8_10.noarch",
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            "SUSE Liberty Linux 8:flatpak-session-helper-0:1.12.9-7.el8_10.x86_64"
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      "threats": [
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          "category": "impact",
          "date": "2026-10-12T00:00:00Z",
          "details": "important"
        }
      ],
      "title": "CVE-2026-90616"
    },
    {
      "cve": "CVE-2026-96275",
      "ids": [
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          "system_name": "SUSE CVE Page",
          "text": "https://www.suse.com/security/cve/CVE-2026-96275"
        }
      ],
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        {
          "category": "general",
          "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.",
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            "SUSE Liberty Linux 8:flatpak-devel-0:1.12.9-7.el8_10.i686",
            "SUSE Liberty Linux 8:flatpak-devel-0:1.12.9-7.el8_10.x86_64",
            "SUSE Liberty Linux 8:flatpak-libs-0:1.12.9-7.el8_10.i686",
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            "SUSE Liberty Linux 8:flatpak-session-helper-0:1.12.9-7.el8_10.x86_64"
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            "baseScore": 8.8,
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        {
          "category": "general",
          "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.",
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          "category": "general",
          "text": "In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session\u0027s directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.",
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      "title": "CVE-2026-96808"
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  ]
}

CVE-2026-90616 (GCVE-0-2026-90616)

Vulnerability from cvelistv5 – Published: 2026-09-12 20:00 – Updated: 2026-09-14 18:22

Summary

In Flatpak before 1.18.1, a malicious sandboxed app can obtain arbitrary read and write access to files on the host, which can be escalated to arbitrary code execution on the host, a different vulnerability than CVE-2026-76925. Flatpak creates a few app data directories (e.g., /var/cache, /var/data, /var/config, and /var/tmp) in every sandbox on every app launch where, in some cases, components of the path are attacker-controlled. Missing symlink protection can redirect the directories. Some of these directories are bind-mounted by Flatpak by passing the path (e.g., /home/user/.var/app/APP_ID/cache/tmp), which contains attacker-controlled directories (tmp) to bwrap --bind SRC DST. bwrap passes the path on to the kernel, which then follows symlinks. A malicious symlink can point to arbitrary locations on the host and it will become mounted inside the sandbox.

Severity

7.4 (High)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-14 18:22 UTC

CWE

CWE-61 - UNIX Symbolic Link (Symlink) Following

Assigner

mitre CNA under the mitre root

CNA scorecard E 27/100 over 2306 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/flatpak/flatpak/security/advis…
https://www.openwall.com/lists/oss-security/2026/…

Impacted products

1 product

Vendor	Product	Version
Flatpak	Flatpak	Affected: 0 , < 1.18.1 (semver) cpe:2.3:a:flatpak:flatpak::::::::

Show details on NVD website

JSON

To clipboard

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CVE-2026-96275 (GCVE-0-2026-96275)

Vulnerability from cvelistv5 – Published: 2026-09-23 15:01 – Updated: 2026-10-12 16:25

Title

Flatpak: flatpak: arbitrary write access as root via extra-data extraction

Summary

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.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-25 18:09 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

redhat CNA under the redhat root

CNA scorecard B 81/100 over 987 records in the last 180 days details

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:80497	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80498	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80687	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-96275	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2539416	issue-trackingx_refsource_REDHAT
https://github.com/flatpak/flatpak/security/advis…

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:1.16.0-9.el10_2.4 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:1.12.9-7.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:1.12.9-4.el9_8.4 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

Date Public

2026-08-11 00:00

Credits

Upstream acknowledges Sebastian Wick as the original reporter.

Show details on NVD website

JSON

To clipboard

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CVE-2026-96280 (GCVE-0-2026-96280)

Vulnerability from cvelistv5 – Published: 2026-09-27 20:19 – Updated: 2026-10-12 16:25

Title

Flatpak: flatpak: buffer overflow in oci delta stream path names on 32-bit systems

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-29 15:50 UTC

CWE

CWE-197 - Numeric Truncation Error

Assigner

redhat CNA under the redhat root

CNA scorecard B 81/100 over 987 records in the last 180 days details

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:80497	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80498	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:80687	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-96280	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2539419	issue-trackingx_refsource_REDHAT
https://github.com/flatpak/flatpak/security/advis…

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:1.16.0-9.el10_2.4 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:1.12.9-7.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::appstream cpe:/a:redhat:enterprise_linux:8::crb
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:1.12.9-4.el9_8.4 , < * (rpm) cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

Date Public

2026-08-11 00:00

Credits

Upstream acknowledges Sebastian Wick as the original reporter.

Show details on NVD website

JSON

To clipboard

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CVE-2026-96808 (GCVE-0-2026-96808)

Vulnerability from cvelistv5 – Published: 2026-09-23 16:58 – Updated: 2026-09-23 18:22

Summary

In Flatpak before 1.18.1, the revokefs writer, used by the flatpak-system-helper to receive repository data from unprivileged callers, validated file paths by rejecting literal .. components but did not prevent symlink traversal. A malicious local user in an active local session could obtain two revokefs sessions via the system helper, create a symlink in one session pointing into the other session's directory, and retain a file descriptor through that symlink. This allowed the attacker to modify files belonging to a different revokefs session after they had been validated and imported by the system helper. In particular, an attacker could use this to tamper with ostree commit objects in the system repository after they passed signature verification, enabling root-controlled file writes to attacker-chosen paths and local root privilege escalation.

Severity

7.4 (High)


                        
                          CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-23 18:22 UTC

CWE

CWE-61 - UNIX Symbolic Link (Symlink) Following

Assigner

mitre CNA under the mitre root

CNA scorecard E 27/100 over 2306 records in the last 180 days details

References

1 reference

URL	Tags
https://github.com/flatpak/flatpak/security/advis…

Impacted products

1 product

Vendor	Product	Version
Flatpak	Flatpak	Affected: 0 , < 1.18.1 (semver) cpe:2.3:a:flatpak:flatpak::::::::

Show details on NVD website

JSON

To clipboard

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              "value": "\u003cp\u003eFixed in 1.18.1 by commits:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/a3583bc87d4f86c2794ff879ea56fce95b0b0b5f\"\u003ea3583bc\u003c/a\u003e \"revokefs: Avoid symlink path traversal out of basefd in simple cases\"\u003c/li\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/b00c7b5073a25bdc34653642de543b5ef6fe0225\"\u003eb00c7b5\u003c/a\u003e \"revokefs: Avoid symlink path traversal in link(), rename()\"\u003c/li\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/4ddb5dc0de1bd25e52627f520a49063d94f79377\"\u003e4ddb5dc\u003c/a\u003e \"revokefs: Avoid symlink path traversal in symlink()\"\u003c/li\u003e\n\u003cli\u003e\u003ca target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/flatpak/flatpak/commit/e7f96b4d1533f735ace2ea21dbf770e8d4be465a\"\u003ee7f96b4\u003c/a\u003e \"revokefs: Avoid symlink path traversal in chmod()\"\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eFor LTS operating system distributions, backports of these changes are available in the flatpak-1.16.x branch.\u003c/p\u003e"
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  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-96808",
    "datePublished": "2026-09-23T16:58:37.139Z",
    "dateReserved": "2026-09-23T16:58:36.801Z",
    "dateUpdated": "2026-09-23T18:22:46.208Z",
    "state": "PUBLISHED"
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}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

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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RHSA-2026:80687

CVE-2026-90616 (GCVE-0-2026-90616)

CVE-2026-96275 (GCVE-0-2026-96275)

CVE-2026-96280 (GCVE-0-2026-96280)

CVE-2026-96808 (GCVE-0-2026-96808)

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Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour