Ubuntu Mako Vulnerability Exposes Sensitive Information

Severity: Medium (Score: 57.1)

Sources: Ubuntu, Linuxsecurity

Summary

A security vulnerability in the Mako templating engine affects multiple Ubuntu releases, including 26.04 LTS and earlier versions down to 16.04 LTS. The flaw, identified as CVE-2026-41205, allows remote attackers to exploit incorrect URI handling with double-slash prefixes in TemplateLookup, potentially exposing sensitive information over the network. Users are advised to update their systems to the specified patched versions to mitigate this risk. The vulnerability was published on April 23, 2026, and is considered a medium severity issue due to its potential impact on data confidentiality. Affected package versions include python3-mako across several Ubuntu releases. Standard system updates are recommended to resolve the issue. Key Points: • CVE-2026-41205 affects multiple Ubuntu versions from 16.04 to 26.04 LTS. • The vulnerability allows remote attackers to expose sensitive information. • Users should update to patched versions of python3-mako 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)