CVE-2026-94422

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd 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
Trending — Patch released this week

Also known asEUVD-2026-91646 (ENISA EUVD)Source: ENISA EUVD

8.8EG
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: 0.5%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An incorrect implementation of message filtering in xdg-dbus-proxy versions before 0.1.9 allows an attacker to bypass the intended message filtering on the D-Bus session bus by setting a reply serial number on non-reply messages. A malicious or compromised Flatpak app could use this to achieve arbitrary code execution outside its sandbox. xdg-dbus-proxy was designed to be part of the sandbox boundary for Flatpak, but it is released as a separate project and is sometimes used by other app frameworks such as Firejail.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.5%
EPSS %ILE
42nd
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 (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.

EG Severity
8.8 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
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). 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 low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 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 low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 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 total (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

October 2, 2026

Last Modified

October 24, 2026

Advisory Details (6)

Auto-updated Oct 2, 2026
Patch available. Sources: redhat, github, github_commit.
Red Hat

2542235 – (CVE-2026-94422) CVE-2026-94422 xdg-dbus-proxy: xdg-dbus-proxy: message filtering bypass via reply serial allows sandbox escape

https://bugzilla.redhat.com/show_bug.cgi?id=2542235
GitHub commit Patch Available

commit e4465a0dfe96 (flatpak/xdg-dbus-proxy)

Patch available: flatpak/xdg-dbus-proxy 0.1.9 (contains commit e4465a0dfe96)

https://github.com/flatpak/xdg-dbus-proxy/commit/e4465a0dfe96da3b39929a30a1ac3a22b16223e3
GitHub commit Patch Available

commit fc027f759316 (flatpak/xdg-dbus-proxy)

Patch available: flatpak/xdg-dbus-proxy 0.1.9 (contains commit fc027f759316)

https://github.com/flatpak/xdg-dbus-proxy/commit/fc027f759316fb2a6c45648200b6f100202eb84e
GitHub commit Patch Available

commit e5702fca4dba (flatpak/xdg-dbus-proxy)

Patch available: flatpak/xdg-dbus-proxy 0.1.9 (contains commit e5702fca4dba)

https://github.com/flatpak/xdg-dbus-proxy/commit/e5702fca4dba9600721921fbca2dbc39dc5ca400
GitHub advisoryMentions a patch (unverified)

CVE-2026-94422: Message filtering bypass via reply serial · Advisory · flatpak/xdg-dbus-proxy · GitHub

Affected: 0.1.9 by commits:

https://github.com/flatpak/xdg-dbus-proxy/security/advisories/GHSA-2cgv-pwcq-wvpq
Red HatMentions a patch (unverified)

CVE-2026-94422 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-94422

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatxdg-dbus-proxy-0:0.1.5-4.el10_2.12026-10-27redhat

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
xdg-dbus-proxy0.1.4-3 ... 0.1.9-1 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
xdg-dbus-proxy0.1.6-1, 0.1.6-1+deb13u1, 0.1.6-1+deb13u2
  • every version up to 0.1.6-1+deb13u3: fixed in 0.1.6-1+deb13u3
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
xdg-dbus-proxy0.1.6-1, 0.1.6-2, 0.1.7-1, 0.1.8-1
  • every version up to 0.1.9-1: fixed in 0.1.9-1
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 51× 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.

  1. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  4. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-27 21:12 UTCEG score recompute
  8. 2026-10-27 21:12 UTCVendor advisory
  9. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-10-25 13:49 UTCEG score recompute
  13. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  14. 2026-10-24 04:26 UTCEG score recompute
  15. 2026-10-24 03:19 UTCEG score recompute
  16. 2026-10-23 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  17. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  18. 2026-10-22 11:30 UTCEG score recompute
  19. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  21. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  22. 2026-10-19 15:17 UTCEG score recompute
  23. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-10-18 02:58 UTCEG score recompute
  25. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
Show 32 more
  1. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  2. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  3. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  4. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  5. 2026-10-13 04:18 UTCEG score recompute
  6. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  7. 2026-10-12 14:42 UTCEG score recompute
  8. 2026-10-11 19:12 UTCEG score recompute
  9. 2026-10-11 16:27 UTCEG score recompute
  10. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  11. 2026-10-11 13:40 UTCEG score recompute
  12. 2026-10-10 21:57 UTCEG score recompute
  13. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-10-09 21:34 UTCEG score recompute
  15. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  16. 2026-10-08 21:11 UTCEG score recompute
  17. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  18. 2026-10-08 08:59 UTCEG score recompute
  19. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  20. 2026-10-06 20:23 UTCEG score recompute
  21. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  22. 2026-10-05 20:00 UTCEG score recompute
  23. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  24. 2026-10-05 07:49 UTCEG score recompute
  25. 2026-10-04 23:23 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  26. 2026-10-03 19:14 UTCEG score recompute
  27. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  28. 2026-10-02 17:29 UTCEG score recompute
  29. 2026-10-02 16:55 UTCEG score recompute
  30. 2026-10-02 14:22 UTCEG score recompute
  31. 2026-10-02 13:56 UTCEG score recomputeFirst assessed: 8.8 HIGH
  32. 2026-10-02 13:55 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Same product

2 shown

Debian:12:xdg-dbus-proxy · Debian:13:xdg-dbus-proxy

Frequently asked(5)

What is CVE-2026-94422?
CVE-2026-94422 is a high-severity vulnerability; its CVE record was published on October 2, 2026. An incorrect implementation of message filtering in xdg-dbus-proxy versions before 0.1.9 allows an attacker to bypass the intended message filtering on the D-Bus session bus by setting a reply serial number on non-reply messages. A malicious or compromised Flatpak app could use this to achieve…
When was CVE-2026-94422 made public?
CVE-2026-94422 was made public on September 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 October 2, 2026. EchelonGraph's copy of the record carries a last-modified date of October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-94422 actively exploited?
CVE-2026-94422 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-94422?
CVE-2026-94422 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-94422?
A fix for CVE-2026-94422 is available: update to the fixed version the vendor names in its advisory.

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