UnratedRed Hat & Ubuntu Linux

Exim vulnerability

USN-8353-1 Published Jun 1, 2026

CVE-2026-48840

Affected products & platforms

Red Hat & Ubuntu LinuxUnclassified

Summary

Warisjeet Singh discovered that Exim with SUPPORT_PROXY enabled did not properly handle memory before SMTP authentication. A remote attacker could possibly use this issue to obtain sensitive information. Affected Ubuntu releases: 26.04, 25.10, 24.04, 22.04. CVEs: CVE-2026-48840.

Affected versions

Ubuntu 26.04
Ubuntu 25.10
Ubuntu 24.04
Ubuntu 22.04

Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Apply available updates: `sudo apt update && sudo apt upgrade` (a standard system update installs the fix).

Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source

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