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VulnerabilityPublished Updated

CVE-2026-10037: Openjdk 9 · A sandbox escape vulnerability exists in the OpenJDK packages provided in Ubuntu

Affects openjdk-9Source GCVE Database

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Authoritative record:CVE-2026-10037· High 8.8

Not known to be exploited · CVSS 8.8 High · fixed in 3.70+nmu1ubuntu1.22.04.1 : patch openjdk-9 soon.

Data as of 9 Nov 2026, 23:24 UTC

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.70+nmu1ubuntu1.22.04.1, 3.70+nmu1ubuntu1.24.04.1, 3.74ubuntu1.1 +1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 26.10mailcappkg:deb/ubuntu/mailcap?arch=source&distro=stonkingOther threatsAffected
  • =3.75ubuntu1
  • =3.76ubuntu1
  • =3.77ubuntu1
Fixed in–
Ubuntu 26.10openjdk-17pkg:deb/ubuntu/openjdk-17?arch=source&distro=stonkingOther threatsAffected
  • 17.0.18+8-1 – 17.0.21~6ea-1
6 affected builds
Fixed in–
Ubuntu 26.10openjdk-17-cracpkg:deb/ubuntu/openjdk-17-crac?arch=source&distro=stonkingOther threatsAffected
  • =17.0.18+8-0ubuntu1
  • =17.0.19+10-0ubuntu1
  • =17.0.20+8-0ubuntu1
Fixed in–
Ubuntu 26.10openjdk-21pkg:deb/ubuntu/openjdk-21?arch=source&distro=stonkingOther threatsAffected
  • 21.0.11+10-1 – 21.0.12~5ea-1
5 affected builds
Fixed in–
Ubuntu 26.10openjdk-21-cracpkg:deb/ubuntu/openjdk-21-crac?arch=source&distro=stonkingOther threatsAffected
  • =21.0.10+7-0ubuntu1
  • =21.0.11+10-0ubuntu1
  • =21.0.12+8-0ubuntu1
Fixed in–
Ubuntu 26.10openjdk-8pkg:deb/ubuntu/openjdk-8?arch=source&distro=stonkingOther threatsAffected
  • 8u482-ga~us1-0ubuntu1 – 8u512-b09~us1-0ubuntu1~26.10.1
5 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and should be applied. Fixed versions include 3.70+nmu1ubuntu1.22.04.1, 3.70+nmu1ubuntu1.24.04.1, 3.74ubuntu1.1, and 3.75ubuntu1.1. Users should upgrade to these or later versions as per the Ubuntu security notice USN-8518-1. No other mitigation steps are indicated by the vendor advisory.

Description

A sandbox escape vulnerability exists in OpenJDK packages provided in Ubuntu. The vulnerability involves .jar MIME handlers that execute files marked as executable when the mailcap package is installed. A malicious sandboxed application can exploit this by writing a malicious .jar file to the host filesystem, setting its executable bit, and triggering execution outside the sandbox via the OpenURI portal through xdg-desktop-portal-gtk.

References

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