CVE-2026-34079: Flatpak is a Linux application sandboxing and distribution framework

Q: How do I fix CVE-2026-34079?

flatpak: upgrade to 1.16.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-34079 being exploited?

CVE-2026-34079 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34079 affect?

CVE-2026-34079 affects flatpak. Severity is high (CVSS 7.5). 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 Prior to 1.16.4, the caching for ld.so removes outdated cache files without properly checking that the app controlled path to the outdated cache is in the cache directory

Q: How urgent is CVE-2026-34079?

Priority 43/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-34079 is a high-severity flaw (CVSS 7.5) affecting flatpak. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 Prior to 1.16.4, the caching for ld.so removes outdated cache files without properly checking that the app controlled path to the outdated cache is in the cache directory.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.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-07
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: flatpak

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 22:16 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

flatpak flatpak UPGRADE

Affected: < 1.16.4

Fixed in: 1.16.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy flatpak || rpm -q flatpak || flatpak --version

2. UPGRADE to 1.16.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flatpak

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flatpak

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:21755] Important: flatpak security update 2026-05-29

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34079?

flatpak: upgrade to 1.16.4. Exact commands for each OS are on this page.

Is CVE-2026-34079 being exploited?

CVE-2026-34079 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34079 affect?

CVE-2026-34079 affects flatpak. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-34079?

Priority 43/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

CVE-2026-34078 CRITICAL 10.0 UPGRADE Flatpak is a Linux application sandboxing and distribution framework

References

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