USN-8518-1: mailcap vulnerability

unknownCVE-2026-10037

Aaron Rainbolt discovered that the cautious-launcher utility in the mailcap package did not properly restrict the execution of certain file types. An attacker could use this issue to escape a sandboxed application and execute arbitrary code on the host operating system.

CSIRTS triage

vendor: mailcap product: mailcap Remote code execution

What: The cautious-launcher utility in the mailcap package does not properly restrict the execution of certain file types, allowing arbitrary code execution.
Who is affected: Deployments of the mailcap package using the cautious-launcher utility.
Urgency: Remediation is urgent due to the potential for arbitrary code execution.
Action: Update the mailcap package to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-08
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8518-1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-100370.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-10037	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

highCVE-2026-10037: A sandbox escape vulnerability exists in the OpenJDK packages provided in Ubuntu. The .jar MIM…nvd