CVE-2026-16730

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-24. a secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and deny service to the desktop session. Flatpak applications can reach the host session bus through the dbus proxy.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: Track

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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

July 24, 2026

Last Modified

September 10, 2026

Advisory Details (3)

Auto-updated Jul 24, 2026
Patch available. Sources: redhat.
generic

dbus-broker-launch shuts down when hitting user soft fd limit · Issue #435 · bus1/dbus-broker · GitHub

https://github.com/bus1/dbus-broker/issues/435
redhat

2506348 – (CVE-2026-16730) CVE-2026-16730 dbus-broker: dbus-broker: session bus denial of service via EMFILE during peer setup

https://bugzilla.redhat.com/show_bug.cgi?id=2506348
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-16730

Vendor Advisories for CVE-2026-16730(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhui5/rhua-rhel9:17888805812026-09-09redhat
redhatdbus-broker-0:36-5.el10_22026-08-31redhat
redhatdbus-broker-0:28-9.el9_82026-08-31redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
dbus-broker26-1 ... 37-5 (31 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
dbus-broker33-1 ... 37-5 (15 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
dbus-broker37-2, 37-3, 37-4, 37-5——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
dbus-broker37-2, 37-3, 37-4, 37-5——

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 26× in last 7d / 89× 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.

Showing the most recent 100 of 139 total refreshes for this CVE.

  1. 2026-09-11 20:54 UTCEG score recompute
  2. 2026-09-11 20:54 UTCVendor advisory
  3. 2026-09-11 20:54 UTCGHSA enrichment
  4. 2026-09-11 14:52 UTCEPSS rescore
  5. 2026-09-11 09:36 UTCEPSS rescore
  6. 2026-09-10 18:24 UTCEG score recompute
  7. 2026-09-10 18:24 UTCVendor advisory
  8. 2026-09-10 18:24 UTCGHSA enrichment
  9. 2026-09-10 17:30 UTCEG score recompute
  10. 2026-09-10 17:30 UTCVendor advisory
  11. 2026-09-10 17:30 UTCGHSA enrichment
  12. 2026-09-10 14:53 UTCEG score recompute
  13. 2026-09-10 14:53 UTCVendor advisory
  14. 2026-09-10 14:53 UTCGHSA enrichment
  15. 2026-09-10 09:34 UTCEPSS rescore
  16. 2026-09-09 08:51 UTCEG score recompute
  17. 2026-09-09 08:51 UTCVendor advisory
  18. 2026-09-09 08:51 UTCGHSA enrichment
  19. 2026-09-08 22:00 UTCEPSS rescore
  20. 2026-09-07 21:27 UTCEG score recompute
  21. 2026-09-07 21:27 UTCVendor advisory
  22. 2026-09-07 21:27 UTCGHSA enrichment
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-05 19:26 UTCEG score recompute
  25. 2026-09-05 19:26 UTCVendor advisory
Show 75 more
  1. 2026-09-05 19:26 UTCGHSA enrichment
  2. 2026-09-04 12:55 UTCEG score recompute
  3. 2026-09-04 12:55 UTCVendor advisory
  4. 2026-09-04 12:55 UTCGHSA enrichment
  5. 2026-09-04 05:06 UTCEPSS rescore
  6. 2026-09-02 14:11 UTCEPSS rescore
  7. 2026-09-01 23:19 UTCEG score recompute
  8. 2026-09-01 23:19 UTCVendor advisory
  9. 2026-09-01 23:19 UTCGHSA enrichment
  10. 2026-09-01 13:53 UTCEPSS rescore
  11. 2026-08-31 15:39 UTCEG score recompute
  12. 2026-08-31 15:39 UTCGHSA enrichment
  13. 2026-08-31 14:30 UTCEG score recompute
  14. 2026-08-31 14:30 UTCGHSA enrichment
  15. 2026-08-31 02:41 UTCEG score recompute
  16. 2026-08-31 02:41 UTCGHSA enrichment
  17. 2026-08-30 19:17 UTCEPSS rescore
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-30 00:21 UTCEG score recompute
  20. 2026-08-30 00:21 UTCGHSA enrichment
  21. 2026-08-28 21:41 UTCEPSS rescore
  22. 2026-08-27 14:25 UTCEPSS rescore
  23. 2026-08-27 10:02 UTCEG score recompute
  24. 2026-08-27 10:02 UTCGHSA enrichment
  25. 2026-08-26 14:46 UTCEPSS rescore
  26. 2026-08-26 05:42 UTCEG score recompute
  27. 2026-08-26 05:42 UTCGHSA enrichment
  28. 2026-08-25 13:48 UTCEPSS rescore
  29. 2026-08-25 03:22 UTCEG score recompute
  30. 2026-08-25 03:22 UTCGHSA enrichment
  31. 2026-08-24 01:02 UTCEG score recompute
  32. 2026-08-24 01:02 UTCGHSA enrichment
  33. 2026-08-23 00:19 UTCEPSS rescore
  34. 2026-08-22 22:43 UTCGHSA enrichment
  35. 2026-08-21 20:23 UTCEG score recompute
  36. 2026-08-21 20:23 UTCGHSA enrichment
  37. 2026-08-21 20:10 UTCEG score recompute
  38. 2026-08-21 20:10 UTCGHSA enrichment
  39. 2026-08-21 00:04 UTCEG score recompute
  40. 2026-08-21 00:03 UTCGHSA enrichment
  41. 2026-08-20 22:55 UTCEPSS rescore
  42. 2026-08-19 21:44 UTCEG score recompute
  43. 2026-08-19 21:44 UTCGHSA enrichment
  44. 2026-08-19 17:03 UTCEPSS rescore
  45. 2026-08-18 18:55 UTCEG score recompute
  46. 2026-08-18 18:55 UTCGHSA enrichment
  47. 2026-08-18 13:48 UTCEPSS rescore
  48. 2026-08-17 15:28 UTCEG score recompute
  49. 2026-08-17 15:28 UTCGHSA enrichment
  50. 2026-08-17 13:47 UTCEPSS rescore
  51. 2026-08-16 14:56 UTCEPSS rescore
  52. 2026-08-16 13:09 UTCEG score recompute
  53. 2026-08-16 13:09 UTCGHSA enrichment
  54. 2026-08-16 02:14 UTCEPSS rescore
  55. 2026-08-15 10:50 UTCEG score recompute
  56. 2026-08-15 10:50 UTCGHSA enrichment
  57. 2026-08-15 01:30 UTCEPSS rescore
  58. 2026-08-14 08:30 UTCEG score recompute
  59. 2026-08-14 08:30 UTCGHSA enrichment
  60. 2026-08-14 07:49 UTCEG score recompute
  61. 2026-08-14 07:49 UTCGHSA enrichment
  62. 2026-08-13 22:00 UTCEPSS rescore
  63. 2026-08-13 06:05 UTCEG score recompute
  64. 2026-08-13 06:05 UTCGHSA enrichment
  65. 2026-08-12 13:50 UTCEPSS rescore
  66. 2026-08-12 03:46 UTCEG score recompute
  67. 2026-08-12 03:46 UTCGHSA enrichment
  68. 2026-08-11 13:42 UTCEPSS rescore
  69. 2026-08-11 01:26 UTCEG score recompute
  70. 2026-08-11 01:26 UTCGHSA enrichment
  71. 2026-08-11 00:00 UTCEPSS rescore
  72. 2026-08-09 23:07 UTCEG score recompute
  73. 2026-08-09 23:07 UTCGHSA enrichment
  74. 2026-08-09 13:46 UTCEPSS rescore
  75. 2026-08-08 20:48 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-16730?
CVE-2026-16730 is a medium vulnerability published on July 24, 2026. A flaw was found in dbus-broker. When the process file-descriptor limit is reached, EMFILE/ENFILE errors during peer setup (notably SO_PEERPIDFD) are handled as fatal failures, causing the broker to exit. A local attacker who can open many connections to the user session bus can trigger this and…
When was CVE-2026-16730 disclosed?
CVE-2026-16730 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16730 actively exploited?
CVE-2026-16730 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 98.6% of all scored CVEs.
What is the CVSS score of CVE-2026-16730?
CVE-2026-16730 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-16730?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16730, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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