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Fencer Vulns
medium 6.5

CVE-2026-96279 json

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

published 2026-09-27 42 d ago modified 2026-11-06 3 d ago also EUVD-2026-88013

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

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
41 d ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.