NVD / CVE Program· CNA GitHub_M

CVE-2026-34079: Flatpak affected by arbitrary file deletion on the host filesystem

Noroxi assessment

Priority: Monitor (action score 34/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.32% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: flatpak flatpak 1.16.4.

Low priority for now. Upgrade to flatpak flatpak 1.16.4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the caching for ld.so removes outdated cache files without properly checking that the app controlled path to the outdated cache is in the cache directory. This allows Flatpak apps to delete arbitrary files on the host. This vulnerability is fixed in 1.16.4.

HighCVSS 8.7 · v4.0—No exploit Fix available

Published: Apr 7, 2026
Updated: Jul 24, 2026
EPSS: 0.3% · 25th percentile
CWE: CWE-22

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 34 / 40 · 8.7 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · GitHub_M: 8.7; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
flatpak	flatpak	cpe:2.3:a:flatpak:flatpak

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

flatpak flatpakbefore 1.16.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

flatpak flatpak
- < 1.16.4affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:10	flatpak	before 1.16.0-9.el10_2.1	1.16.0-9.el10_2.1
AlmaLinux:10	flatpak-devel	before 1.16.0-9.el10_2.1	1.16.0-9.el10_2.1
AlmaLinux:10	flatpak-libs	before 1.16.0-9.el10_2.1	1.16.0-9.el10_2.1
AlmaLinux:10	flatpak-selinux	before 1.16.0-9.el10_2.1	1.16.0-9.el10_2.1
AlmaLinux:10	flatpak-session-helper	before 1.16.0-9.el10_2.1	1.16.0-9.el10_2.1
AlmaLinux:8	flatpak	before 1.12.9-4.el8_10	1.12.9-4.el8_10
AlmaLinux:8	flatpak-devel	before 1.12.9-4.el8_10	1.12.9-4.el8_10
AlmaLinux:8	flatpak-libs	before 1.12.9-4.el8_10	1.12.9-4.el8_10
AlmaLinux:8	flatpak-selinux	before 1.12.9-4.el8_10	1.12.9-4.el8_10
AlmaLinux:8	flatpak-session-helper	before 1.12.9-4.el8_10	1.12.9-4.el8_10
AlmaLinux:9	flatpak	before 1.12.9-4.el9_8.1	1.12.9-4.el9_8.1
AlmaLinux:9	flatpak-devel	before 1.12.9-4.el9_8.1	1.12.9-4.el9_8.1
AlmaLinux:9	flatpak-libs	before 1.12.9-4.el9_8.1	1.12.9-4.el9_8.1
AlmaLinux:9	flatpak-selinux	before 1.12.9-4.el9_8.1	1.12.9-4.el9_8.1
AlmaLinux:9	flatpak-session-helper	before 1.12.9-4.el9_8.1	1.12.9-4.el9_8.1
Debian:12	flatpak	before 1.14.10-1~deb12u2	1.14.10-1~deb12u2
Debian:13	flatpak	before 1.16.6-1~deb13u1	1.16.6-1~deb13u1
Debian:14	flatpak	before 1.16.4-1	1.16.4-1
openSUSE:Tumbleweed	flatpak	before 1.16.6-1.1	1.16.6-1.1
Red Hat:enterprise_linux_eus:10.0	flatpak	before 0:1.16.0-5.el10_0.2	0:1.16.0-5.el10_0.2
Red Hat:enterprise_linux_eus:10.0	flatpak-debuginfo	before 0:1.16.0-5.el10_0.2	0:1.16.0-5.el10_0.2
Red Hat:enterprise_linux_eus:10.0	flatpak-debugsource	before 0:1.16.0-5.el10_0.2	0:1.16.0-5.el10_0.2
Red Hat:enterprise_linux_eus:10.0	flatpak-devel	before 0:1.16.0-5.el10_0.2	0:1.16.0-5.el10_0.2
Red Hat:enterprise_linux_eus:10.0	flatpak-libs	before 0:1.16.0-5.el10_0.2	0:1.16.0-5.el10_0.2

+96

Same product

flatpak: all records

Other highest-scoring records for the same primary product.

CVE-2024-42472Flatpak may allow access to files outside sandbox for certain apps
40Plan
CVE-2026-34078Flatpak has a complete sandbox escape leading to host file access and code execution in the host context
38Monitor
CVE-2019-10063Flatpak before 1.0.8, 1.1.x and 1.2.x before 1.2.4, and 1.3.x before 1.3.1 allows a sandbox bypass.
37Monitor

Published before and after this one in the same product

← EarlierCVE-2023-28101Mar 16, 2023 · Flatpak metadata with ANSI control codes can cause misleading terminal output
17Monitor
← EarlierCVE-2024-32462Apr 18, 2024 · Flatpak vulnerable to a sandbox escape via RequestBackground portal due to bad argument parsing
33Monitor
Later →CVE-2026-90616Sep 12, 2026 · 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
29Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
flatpak flatpak	1.16.4 · description	Vendor (CNA)
almalinux:flatpak	1.12.9-4.el9_8.1 · AlmaLinux:9	Package registry (OSV)
almalinux:flatpak-devel	1.12.9-4.el9_8.1 · AlmaLinux:9	Package registry (OSV)
almalinux:flatpak-libs	1.12.9-4.el9_8.1 · AlmaLinux:9	Package registry (OSV)
almalinux:flatpak-selinux	1.12.9-4.el9_8.1 · AlmaLinux:9	Package registry (OSV)
almalinux:flatpak-session-helper	1.12.9-4.el9_8.1 · AlmaLinux:9	Package registry (OSV)
debian:flatpak	1.14.10-1~deb12u2 · Debian:12	Package registry (OSV)
opensuse:flatpak	1.16.6-1.1 · openSUSE:Tumbleweed	Package registry (OSV)
red hat:flatpak	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:flatpak-builder	0:1.0.0-16.el7_9 · Red Hat:rhel_els:7	Package registry (OSV)
red hat:flatpak-debuginfo	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:flatpak-debugsource	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:flatpak-devel	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::crb	Package registry (OSV)
red hat:flatpak-libs	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:flatpak-libs-debuginfo	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:flatpak-selinux	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:flatpak-session-helper	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:flatpak-session-helper-debuginfo	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
red hat:flatpak-tests-debuginfo	0:1.12.9-4.el9_8.1 · Red Hat:enterprise_linux:9::appstream	Package registry (OSV)
rocky linux:flatpak	0:1.12.9-4.el9_8.1 · Rocky Linux:9	Package registry (OSV)
suse:flatpak	1.12.8-150400.3.12.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-92162196 days apartFlatpak vulnerable to path traversal via unvalidated "arch" parameter in DeployAppstream
28Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: X

Weakness class (CWE)

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

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:46 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/flatpak/flatpak/security/advisories/GHSA-p29x-r292-46pp

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records