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Fencer Vulns
high 8.8

CVE-2026-10037 json

Sandbox Escape in Ubuntu OpenJDK Packages via xdg-desktop-portal

published 2026-07-08 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-42435

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

A sandbox escape vulnerability exists in the OpenJDK packages provided in Ubuntu. The .jar MIME handlers installed by these packages execute files marked as executable when the mailcap package is installed. A compromised or malicious sandboxed application with access to the OpenURI portal via xdg-desktop-portal-gtk can write a malicious .jar file to the host file system, set its executable bit, and trigger the handler to execute arbitrary code outside of the sandbox environment.

Patch / fix

  • Canonical Ubuntu 3.70+nmu1ubuntu1.22.04.1, 3.70+nmu1ubuntu1.24.04.1, 3.74ubuntu1.1, 3.75ubuntu1.1
  • mailcap Ubuntu 22.04 LTS 3.70+nmu1ubuntu1.22.04.1
  • mailcap Ubuntu 24.04 LTS 3.70+nmu1ubuntu1.24.04.1
  • mailcap Ubuntu 25.10 3.74ubuntu1.1
  • mailcap Ubuntu 26.04 LTS 3.75ubuntu1.1

ubuntu advisories UBUNTU-CVE-2026-10037

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-10037 updated cvss 8.8

openjdk: OpenJDK: Sandbox escape allows arbitrary code execution

  • Red Hat Hardened Images java-25-openjdk 1:25.0.3.0.9-2.hum1, java-21-openjdk 1:21.0.11.0.10-2.hum1
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Canonical Ubuntu

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.