CVE-2026-19816

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (below the 1st percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
below the 1st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 14, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: redhat, github_commit, github.
github Patch Available🟡 PoC Available

PackageKit dnf5 ignores SIMULATE on RepoRemove · Advisory · PackageKit/PackageKit · GitHub

https://github.com/PackageKit/PackageKit/security/advisories/GHSA-g5gf-h68q-gxc8
github_commit

commit 33be77b3ecd3 (PackageKit/PackageKit)

Fix landed in PackageKit/PackageKit commit 33be77b3ecd3 — awaiting tagged release

https://github.com/PackageKit/PackageKit/commit/33be77b3ecd3b566ca117358dc18c58c964e627b
redhat

2515940 – (CVE-2026-19816) CVE-2026-19816 packagekit: PackageKit: PackageKit dnf5 ignores SIMULATE on RepoRemove

https://bugzilla.redhat.com/show_bug.cgi?id=2515940

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 01:42 UTCEG score recompute
  2. 2026-10-03 01:28 UTCEG score recompute
  3. 2026-10-02 01:25 UTCEG score recompute
  4. 2026-10-01 19:49 UTCEPSS rescore
  5. 2026-10-01 01:27 UTCEG score recompute
  6. 2026-09-30 15:03 UTCEPSS rescore
  7. 2026-09-29 08:54 UTCEG score recompute
  8. 2026-09-27 20:56 UTCEG score recompute
  9. 2026-09-27 13:47 UTCEPSS rescore
  10. 2026-09-26 20:58 UTCEG score recompute
  11. 2026-09-26 15:58 UTCEPSS rescore
  12. 2026-09-26 08:58 UTCEG score recompute
  13. 2026-09-24 19:54 UTCEG score recompute
  14. 2026-09-23 19:55 UTCEG score recompute
  15. 2026-09-22 19:56 UTCEG score recompute
  16. 2026-09-22 07:54 UTCEG score recompute
  17. 2026-09-21 07:56 UTCEG score recompute
  18. 2026-09-19 19:40 UTCEG score recompute
  19. 2026-09-18 19:41 UTCEG score recompute
  20. 2026-09-18 19:27 UTCEPSS rescore
  21. 2026-09-17 19:42 UTCEG score recompute
  22. 2026-09-16 19:43 UTCEG score recompute
  23. 2026-09-16 14:07 UTCEPSS rescore
  24. 2026-09-16 07:43 UTCEG score recompute
  25. 2026-09-16 05:14 UTCEPSS rescore
Show 5 more
  1. 2026-09-15 19:40 UTCEG score recompute
  2. 2026-09-15 18:24 UTCEG score recompute
  3. 2026-09-14 20:21 UTCEG score recompute
  4. 2026-09-14 20:15 UTCEG score recompute
  5. 2026-09-14 20:14 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-19816?
CVE-2026-19816 is a high vulnerability published on September 14, 2026. 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 ||…
When was CVE-2026-19816 disclosed?
CVE-2026-19816 was first published on September 14, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19816 actively exploited?
CVE-2026-19816 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (below the 1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19816?
CVE-2026-19816 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19816?
A fix for CVE-2026-19816 is available: update to the fixed version the vendor names in its advisory.

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