3.6

CVE-2026-97027: Flatpak: flatpak: denial of service via unsanitized keys in exported desktop entry / d-bus service files

Awaiting analysis
AliasesUBUNTU-CVE-2026-97027DEBIAN-CVE-2026-97027
Published 28-09-2026Last modified 29-09-2026

Vulnerability summary

CVE-2026-97027 is a low (CVSS 3.6) Improper Input Validation vulnerability in flatpak. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.1% of scored vulnerabilities.

Overall risk
14/100
0100
Low · default modelHow is this calculated?
CVSS score
3.6/10
010
Low · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
MGASA-2026-0477OPENSUSE-SU-2026:11918-1

Timeline

  1. 28-09-2026
    PublishedVulnerability first disclosed.
  2. 29-09-2026
    Last modifiedVulnerability information updated.

Description

Flatpak passes through arbitrary vendor-extension keys unmodified when exporting an application's Desktop Entry (.desktop) and D-Bus Service (.service) files, instead of validating against an allowlist. A malicious Flatpak app can use this to cause denial of service (e.g. forced application restart loops) or to influence host D-Bus/systemd activation behavior beyond what the sandbox is intended to permit.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

29-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • flatpakAll versions (No fix recorded) | < 1.16.6-1~deb13u3 | < 1.18.4-1
Ubuntu1 product
  • flatpakAll versions (No fix recorded)

2 vendors · 2 products

References

6 links