CVE-2026-34078

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 1.7%, top 25% of all CVEs by exploit prediction. 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, nvd
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 10.0Exploit: None knownExposed: 0

A fix is available — apply it.

Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to all host files and can be used as a primitive to gain code execution in the host context. This vulnerability is fixed in 1.16.4.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
61(Track)
EG Risk 61/100SSVC: 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
Severity100% × 45%
Exploitation2% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
75%
KEV
Not listed

Published

April 7, 2026

Last Modified

July 24, 2026

Advisory Details (10)

Auto-updated Sep 5, 2026
Patch available. Sources: github, redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:23420
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:23419
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:23418
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:23417
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:21757
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:21756
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:21755
generic

oss-security - xdg-desktop-portal GHSA-rqr9-jwwf-wxgj: Trashing of arbitrary host files

http://www.openwall.com/lists/oss-security/2026/04/10/14
generic

oss-security - Re: 4 security fixes in Flatpak, including critical CVE-2026-34078: Complete sandbox escape leading to host file access and code execution in the host context

http://www.openwall.com/lists/oss-security/2026/04/09/8
github Patch Available

CVE-2026-34078: Complete sandbox escape leading to host file access and code execution in the host context · Advisory · flatpak/flatpak · GitHub

Affected: version 1.16.4 and will be patched in the upcoming version 1.18.0.

https://github.com/flatpak/flatpak/security/advisories/GHSA-cc2q-qc34-jprg

Vendor Advisories for CVE-2026-34078(11)

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

Patch Availability(11)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatflatpak-0:1.12.9-3.el7_92026-07-06redhat
redhatflatpak-0:1.12.9-2.el8_42026-06-29redhat
redhatflatpak-0:1.12.9-1.el8_62026-06-11redhat
redhatflatpak-0:1.12.9-1.el8_82026-06-10redhat
redhatflatpak-0:1.12.9-3.el9_4.12026-06-04redhat
redhatflatpak-0:1.12.7-5.el9_2.12026-06-04redhat
redhatflatpak-0:1.16.0-5.el10_0.22026-06-04redhat
redhatflatpak-0:1.12.9-4.el9_6.12026-06-04redhat
redhatflatpak-0:1.12.9-4.el9_8.12026-05-28redhat
redhatflatpak-0:1.12.9-4.el8_102026-05-28redhat
redhatflatpak-0:1.16.0-9.el10_2.12026-05-28redhat

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
flatpak1.10.2-3 ... 1.18.0-1 (92 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
flatpak1.14.10-1~deb12u1 ... 1.14.8-1~deb12u1 (10 versions)1.14.10-1~deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
flatpak1.16.1-1 ... 1.16.6-1~deb13u1~bpo12+1 (11 versions)1.16.6-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
flatpak1.16.1-1 ... 1.16.3-1~deb13u1 (7 versions)1.16.4-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 70× 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 220 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-34078?
CVE-2026-34078 is a critical vulnerability published on April 7, 2026. Flatpak is a Linux application sandboxing and distribution framework. Prior to 1.16.4, the Flatpak portal accepts paths in the sandbox-expose options which can be app-controlled symlinks pointing at arbitrary paths. Flatpak run mounts the resolved host path in the sandbox. This gives apps access to…
When was CVE-2026-34078 disclosed?
CVE-2026-34078 was first published in the National Vulnerability Database on April 7, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34078 actively exploited?
CVE-2026-34078 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 24.6% of all scored CVEs.
What is the CVSS score of CVE-2026-34078?
CVE-2026-34078 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-34078?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34078, 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.

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