CVE-2026-19816

HIGHPre-NVD 7.17.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (3rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-78063 (ENISA EUVD)Source: ENISA EUVD

7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • 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 32/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity71% × 45%
Impact severity (EG Severity): CVSS 7.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
3rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.1): severity, escalated by confirmed exploitation. This CVE's 7.1 is its impact severity (EG Severity), not escalated.

EG Severity
7.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 14, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
Patch available. Sources: redhat, github_commit, github.
GitHub advisoryMentions a patch (unverified)

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
Red Hat

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

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
packagekit1.2.6-5 ... 1.4.0-1 (16 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
packagekit1.3.1-1 ... 1.4.0-1 (9 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
packagekit1.3.1-1 ... 1.3.6-1 (7 versions)
  • every version up to 1.4.0-1: fixed in 1.4.0-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 25× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-13 16:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-11-13 10:53 UTCEchelonGraph re-scored
  3. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-11-10 16:42 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-11-06 18:31 UTCEchelonGraph re-scored
  9. 2026-11-06 16:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-11-03 16:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-31 02:14 UTCEchelonGraph re-scored
  17. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-10-25 14:44 UTCEchelonGraph re-scored
  24. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-10-24 09:58 UTCEchelonGraph re-scored
Show 59 more
  1. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-18 03:57 UTCEchelonGraph re-scored
  4. 2026-10-17 17:41 UTCEchelonGraph re-scored
  5. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  7. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  8. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  9. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  11. 2026-10-12 16:24 UTCEchelonGraph re-scored
  12. 2026-10-11 19:43 UTCEchelonGraph re-scored
  13. 2026-10-11 17:19 UTCEchelonGraph re-scored
  14. 2026-10-11 14:51 UTCEchelonGraph re-scored
  15. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-10-11 06:00 UTCEchelonGraph re-scored
  17. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-10-10 04:13 UTCEchelonGraph re-scored
  19. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-10-08 22:53 UTCEchelonGraph re-scored
  21. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-10-08 01:42 UTCEchelonGraph re-scored
  23. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  24. 2026-10-07 01:43 UTCEchelonGraph re-scored
  25. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  26. 2026-10-06 01:43 UTCEchelonGraph re-scored
  27. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  28. 2026-10-05 01:40 UTCEchelonGraph re-scored
  29. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  30. 2026-10-04 01:42 UTCEchelonGraph re-scored
  31. 2026-10-03 01:28 UTCEchelonGraph re-scored
  32. 2026-10-02 01:25 UTCEchelonGraph re-scored
  33. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  34. 2026-10-01 01:27 UTCEchelonGraph re-scored
  35. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  36. 2026-09-29 08:54 UTCEchelonGraph re-scored
  37. 2026-09-27 20:56 UTCEchelonGraph re-scored
  38. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  39. 2026-09-26 20:58 UTCEchelonGraph re-scored
  40. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  41. 2026-09-26 08:58 UTCEchelonGraph re-scored
  42. 2026-09-24 19:54 UTCEchelonGraph re-scored
  43. 2026-09-23 19:55 UTCEchelonGraph re-scored
  44. 2026-09-22 19:56 UTCEchelonGraph re-scored
  45. 2026-09-22 07:54 UTCEchelonGraph re-scored
  46. 2026-09-21 07:56 UTCEchelonGraph re-scored
  47. 2026-09-19 19:40 UTCEchelonGraph re-scored
  48. 2026-09-18 19:41 UTCEchelonGraph re-scored
  49. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  50. 2026-09-17 19:42 UTCEchelonGraph re-scored
  51. 2026-09-16 19:43 UTCEchelonGraph re-scored
  52. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  53. 2026-09-16 07:43 UTCEchelonGraph re-scored
  54. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  55. 2026-09-15 19:40 UTCEchelonGraph re-scored
  56. 2026-09-15 18:24 UTCEchelonGraph re-scored
  57. 2026-09-14 20:21 UTCEchelonGraph re-scored
  58. 2026-09-14 20:15 UTCEchelonGraph re-scoredFirst assessed: 7.1 HIGH
  59. 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-severity vulnerability; its CVE record was 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 made public?
CVE-2026-19816 was made public on September 9, 2026: that is the date its CVE record's CNA, Fedora Project, gives for when the vulnerability was made public. The CVE record itself was published on September 14, 2026. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
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 (3rd 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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