CVE-2026-96279Network attack vector

Host file disclosure via absolute hardlink targets

Published Sep 27, 2026 · Updated Sep 27, 2026

Path traversal in Flatpak 1.17.0 through 1.18.0 allows remote attackers to read arbitrary host files via a malicious OCI registry. During OCI layer extraction, entry paths are rebased with g_build_filename, but absolute hardlink targets pass unchanged to libarchive's link() call. Exploitation requires control of an OCI registry and a user-initiated install or update; system-wide operations expose root-readable files.

CVSS severity6.5
Medium
EPSS probability0.63%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Flatpak 1.17.0 through 1.18.0 allows remote attackers to read arbitrary host files via a malicious OCI registry. During OCI layer extraction, entry paths are rebased with g_build_filename, but absolute hardlink targets pass unchanged to libarchive's link() call. Exploitation requires control of an OCI registry and a user-initiated install or update; system-wide operations expose root-readable files.

The record

CVE
CVE-2026-96279
Published
Sep 27, 2026
Updated
Sep 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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