Ubuntu Mako Vulnerability Exposes Sensitive Information

Severity: Medium (Score: 45.9)

Sources: Linuxsecurity, Ubuntu

Summary

A vulnerability in the Mako templating engine affects multiple Ubuntu releases, including 26.04 LTS and earlier versions. Discovered on April 23, 2026, the flaw allows remote attackers to exploit improperly handled URIs with double-slash prefixes in TemplateLookup, potentially exposing sensitive information over the network. The affected Ubuntu versions include 26.04 LTS, 25.10, 24.04 LTS, 22.04 LTS, 20.04 LTS, 18.04 LTS, and 16.04 LTS. Users are advised to update to the latest package versions to mitigate the risk. The issue is categorized under CVE-2026-41205. A standard system update is recommended to apply the necessary patches. The vulnerability does not currently indicate any active exploitation in the wild. Key Points: • Mako vulnerability allows potential exposure of sensitive information. • Affected Ubuntu versions include 26.04 LTS and earlier releases. • Users should update to the latest package versions to mitigate risks.

Key Entities

• Data Breach (attack_type)
• CVE-2026-41205 (cve)
• CWE-200 - Exposure of Sensitive Information (cwe)
• T1041 - Exfiltration Over C2 Channel (mitre_attack)
• Mako (platform)
• Python (tool)
• Ubuntu (company)
• Mako Vulnerability (vulnerability)