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Fencer Intel
medium 6.5

CVE-2026-96279 json

Flatpak: flatpak: path traversal issue in oci archive extraction via hardlinks

published 3mo ago modified 6d ago also EUVD-2026-88013 , GHSA-9rww-v4mm-x4jg

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository flatpak/flatpak. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

A malicious OCI registry can hardlink arbitrary host files into the extraction directory when a user installs or updates a Flatpak application from an OCI remote, allowing disclosure of arbitrary host file contents. For system-wide installs running as root, this includes sensitive files such as /etc/shadow.

Patch / fix

  • flatpak Debian 14 1.18.1-1

debian advisories DEBIAN-CVE-2026-96279

Is CVE-2026-96279 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-96279 updated cvss 6.5

flatpak: flatpak: Path traversal issue in OCI archive extraction via hardlinks

  • Red Hat Enterprise Linux 10 flatpak 1.18.0-1.el10
    affected: workaround, no fix available “Only install applications from trusted OCI registries. Flatpak remotes using the default OSTree transport are not affected.”
  • Red Hat Enterprise Linux 7 flatpak, flatpak-libs, flatpak-builder, flatpak 1.18.0-1.el10 Red Hat Enterprise Linux 8 flatpak, flatpak-libs, flatpak-selinux, flatpak 1.18.0-1.el10, flatpak-session-helper Red Hat Enterprise Linux 9 flatpak, flatpak-libs, flatpak-selinux, flatpak 1.18.0-1.el10, flatpak-session-helper
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

  • 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

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of flatpak/flatpak published their own advisory on GitHub. Reviewed sources take precedence over it.