High severity · published Sep 14, 2026
CVE-2026-19816
PackageKit: dnf5 backend ignores SIMULATE on RepoRemove
7.1
CVSS
0.1%
EPSS
No
On KEV
Description
A flaw was found in PackageKit. PackageKit skips the polkit authorization check for transactions carrying the SIMULATE (dry-run) flag. In the dnf5 backend, the RepoRemove handler ignores that contract and always executes the real transaction because its guard is written as (role == REPO_REMOVE || !SIMULATE), which is always true for RepoRemove. An unprivileged local user can therefore perform a genuine package uninstall while claiming to simulate. This vulnerability only affects systems using PackageKit with the dnf5 backend.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedora
1.3.4 before 1.4.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-19816
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-19816
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2515940
github.com
https://github.com/PackageKit/PackageKit/commit/33be77b3ecd3b566ca117358dc18c58c964e627b
github.com
https://github.com/PackageKit/PackageKit/security/advisories/GHSA-g5gf-h68q-gxc8
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