CVE-2026-10037: Openjdk 9 · A sandbox escape vulnerability exists in the OpenJDK packages provided in Ubuntu
Affects openjdk-9Source GCVE Database
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
- 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:HExploitation evidence
Disclosed: evidence found.
CVE published 8 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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.
Patches and advisories
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10mailcappkg:deb/ubuntu/mailcap?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10openjdk-17pkg:deb/ubuntu/openjdk-17?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10openjdk-17-cracpkg:deb/ubuntu/openjdk-17-crac?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10openjdk-21pkg:deb/ubuntu/openjdk-21?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10openjdk-21-cracpkg:deb/ubuntu/openjdk-21-crac?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10openjdk-8pkg:deb/ubuntu/openjdk-8?arch=source&distro=stonkingOther threats | Affected
| 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.