synced 2 MIN AGO
01 Record

CVE-2026-96808

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

HighPUBLISHEDCNA: mitre
CNA base score7.4 CVSS v3.xCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
View raw JSON

02 Description

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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.11% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 1.5% of scored records. A rank, not a probability.
NVD base score
7.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-09-24.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-09-23 16:58Z1 MO AGO
Last updated
2026-09-23 18:22Z1 MO AGO
Reserved
2026-09-23
Assigning CNA
mitre
Record state
PUBLISHED
Severity
High (CVSS 7.4)
CNA CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-61UNIX Symbolic Link (Symlink) FollowingCompound
  • CWE-59Improper Link Resolution Before File Access ('Link Following')Base
Data version
5.2
Document digest
ed74e3eb3d04340c22e500eeb1f0b84e7a690c10f53365c903729b8c23fea85f

05 Affected products

VendorProductVersionsPlatforms
FlatpakFlatpak0 to < 1.18.1Linux

06 References

07 Remediation

Fixed in 1.18.1 by commits: * a3583bc https://github.com/flatpak/flatpak/commit/a3583bc87d4f86c2794ff879ea56fce95b0b0b5f "revokefs: Avoid symlink path traversal out of basefd in simple cases" * b00c7b5 https://github.com/flatpak/flatpak/commit/b00c7b5073a25bdc34653642de543b5ef6fe0225 "revokefs: Avoid symlink path traversal in link(), rename()" * 4ddb5dc https://github.com/flatpak/flatpak/commit/4ddb5dc0de1bd25e52627f520a49063d94f79377 "revokefs: Avoid symlink path traversal in symlink()" * e7f96b4 https://github.com/flatpak/flatpak/commit/e7f96b4d1533f735ace2ea21dbf770e8d4be465a "revokefs: Avoid symlink path traversal in chmod()" For LTS operating system distributions, backports of these changes are available in the flatpak-1.16.x branch.

08 Fixed in

AlmaLinux 8

  • flatpak
    Fixed in 1.12.9-7.el8_10
  • flatpak-devel
    Fixed in 1.12.9-7.el8_10
  • flatpak-libs
    Fixed in 1.12.9-7.el8_10
  • flatpak-selinux
    Fixed in 1.12.9-7.el8_10
  • flatpak-session-helper
    Fixed in 1.12.9-7.el8_10

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • flatpak
    Fixed in 1.12.9-4.el9_8.4
  • flatpak-devel
    Fixed in 1.12.9-4.el9_8.4
  • flatpak-libs
    Fixed in 1.12.9-4.el9_8.4
  • flatpak-selinux
    Fixed in 1.12.9-4.el9_8.4
  • flatpak-session-helper
    Fixed in 1.12.9-4.el9_8.4

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • flatpak
    Fixed in 1.16.0-9.el10_2.4
  • flatpak-devel
    Fixed in 1.16.0-9.el10_2.4
  • flatpak-libs
    Fixed in 1.16.0-9.el10_2.4
  • flatpak-selinux
    Fixed in 1.16.0-9.el10_2.4
  • flatpak-session-helper
    Fixed in 1.16.0-9.el10_2.4

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • flatpak
    Fixed in 1.12.9-7.el8_10
  • flatpak-devel
    Fixed in 1.12.9-7.el8_10
  • flatpak-libs
    Fixed in 1.12.9-7.el8_10
  • flatpak-selinux
    Fixed in 1.12.9-7.el8_10
  • flatpak-session-helper
    Fixed in 1.12.9-7.el8_10

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • flatpak
    Fixed in 1.12.9-4.el9_8.4
  • flatpak-devel
    Fixed in 1.12.9-4.el9_8.4
  • flatpak-libs
    Fixed in 1.12.9-4.el9_8.4
  • flatpak-selinux
    Fixed in 1.12.9-4.el9_8.4
  • flatpak-session-helper
    Fixed in 1.12.9-4.el9_8.4

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • flatpak
    Fixed in 1.16.0-9.el10_2.4
  • flatpak-devel
    Fixed in 1.16.0-9.el10_2.4
  • flatpak-libs
    Fixed in 1.16.0-9.el10_2.4
  • flatpak-selinux
    Fixed in 1.16.0-9.el10_2.4
  • flatpak-session-helper
    Fixed in 1.16.0-9.el10_2.4

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • flatpak
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • flatpak
    Fixed in 1.16.6-1~deb13u2

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • flatpak
    Fixed in 1.18.1-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • flatpak
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • flatpak
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • flatpak
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 22.04 LTS

  • flatpak
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 24.04 LTS

  • flatpak
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.