CVE-2026-16730

MEDIUMPre-NVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

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, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2026-48559 (ENISA EUVD) · GHSA-77qf-9j4m-ph58 (GitHub Security Advisories)Source: ENISA EUVD

5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

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
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 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
0.2%
EPSS %ILE
4th
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 (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS. 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: 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.

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

July 24, 2026

Last Modified

September 10, 2026

Advisory Details (3)

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

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
Red Hat

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
Red HatMentions a patch (unverified)

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
dbus-broker26-1 ... 37-5 (31 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
dbus-broker33-1 ... 37-5 (15 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
dbus-broker37-2, 37-3, 37-4, 37-5
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
dbus-broker37-2, 37-3, 37-4, 37-5
  • every version on: no fix on record
—

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 11× in last 7d / 48× 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 it from the CNA feed. 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). Most recent first.

Showing the most recent 100 of 214 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 114 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  2. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  3. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.2% · 4th percentile
  4. 2026-10-25 14:46 UTCEG score recompute
  5. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  7. 2026-10-23 06:19 UTCEG score recompute
  8. 2026-10-23 06:19 UTCVendor advisory
  9. 2026-10-23 06:19 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  10. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  11. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  12. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  13. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  14. 2026-10-18 04:00 UTCEG score recompute
  15. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  19. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  21. 2026-10-12 16:30 UTCEG score recompute
  22. 2026-10-11 20:09 UTCEG score recompute
  23. 2026-10-11 17:21 UTCEG score recompute
  24. 2026-10-11 14:54 UTCEG score recompute
  25. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
Show 75 more
  1. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  7. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  8. 2026-10-04 07:47 UTCEG score recompute
  9. 2026-10-04 07:47 UTCVendor advisory
  10. 2026-10-04 07:47 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  11. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  12. 2026-10-03 03:21 UTCEG score recompute
  13. 2026-10-03 03:21 UTCVendor advisory
  14. 2026-10-03 03:21 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  15. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-10-01 06:12 UTCEG score recompute
  17. 2026-10-01 06:12 UTCVendor advisory
  18. 2026-10-01 06:12 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  19. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  21. 2026-09-28 05:01 UTCEG score recompute
  22. 2026-09-28 05:01 UTCVendor advisory
  23. 2026-09-28 05:01 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  24. 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  26. 2026-09-25 10:17 UTCEG score recompute
  27. 2026-09-25 10:17 UTCVendor advisory
  28. 2026-09-25 10:17 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  29. 2026-09-24 01:05 UTCVendor advisory
  30. 2026-09-24 01:05 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  31. 2026-09-22 22:37 UTCEG score recompute
  32. 2026-09-22 22:37 UTCVendor advisory
  33. 2026-09-22 22:37 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  34. 2026-09-20 01:44 UTCVendor advisory
  35. 2026-09-20 01:44 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  36. 2026-09-18 03:02 UTCEG score recompute
  37. 2026-09-18 03:02 UTCVendor advisory
  38. 2026-09-18 03:02 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  39. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  40. 2026-09-16 12:00 UTCVendor advisory
  41. 2026-09-16 12:00 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  42. 2026-09-15 09:41 UTCEG score recompute
  43. 2026-09-15 09:41 UTCVendor advisory
  44. 2026-09-15 09:41 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  45. 2026-09-14 02:31 UTCEG score recompute
  46. 2026-09-14 02:31 UTCVendor advisory
  47. 2026-09-14 02:31 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  48. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  49. 2026-09-13 00:11 UTCVendor advisory
  50. 2026-09-13 00:11 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  51. 2026-09-11 20:54 UTCEG score recompute
  52. 2026-09-11 20:54 UTCVendor advisory
  53. 2026-09-11 20:54 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  54. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  55. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  56. 2026-09-10 18:24 UTCEG score recompute
  57. 2026-09-10 18:24 UTCVendor advisory
  58. 2026-09-10 18:24 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  59. 2026-09-10 17:30 UTCEG score recompute
  60. 2026-09-10 17:30 UTCVendor advisory
  61. 2026-09-10 17:30 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  62. 2026-09-10 14:53 UTCEG score recompute
  63. 2026-09-10 14:53 UTCVendor advisory
  64. 2026-09-10 14:53 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  65. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  66. 2026-09-09 08:51 UTCEG score recompute
  67. 2026-09-09 08:51 UTCVendor advisory
  68. 2026-09-09 08:51 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  69. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  70. 2026-09-07 21:27 UTCEG score recompute
  71. 2026-09-07 21:27 UTCVendor advisory
  72. 2026-09-07 21:27 UTCGHSA enrichmentGHSA-77qf-9j4m-ph58 · GitHub CVSS 5.5
  73. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  74. 2026-09-05 19:26 UTCEG score recompute
  75. 2026-09-05 19:26 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-16730?
CVE-2026-16730 is a medium-severity vulnerability; its CVE record was 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 made public?
CVE-2026-16730 was made public on July 23, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 24, 2026. EchelonGraph's copy of the record carries a last-modified date of September 10, 2026; the record at its source may have been updated since.
Is CVE-2026-16730 actively exploited?
CVE-2026-16730 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16730?
CVE-2026-16730 has a CVSS base score of 5.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-16730?
A fix for CVE-2026-16730 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-16730 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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