Critical Vulnerabilities in Debian Dovecot and Flatpak Exploited

Linuxsecurity

Critical Vulnerabilities in Debian Dovecot and Flatpak Exploited

First seen 29 Sep 2026, 15:40 UTC • •72.9

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ThreatCluster •September 29, 2026 at 16:22 UTC

•CISA confirms active exploitation of critical vulnerabilities in Debian packages.
•Users must upgrade Dovecot and Flatpak to the latest versions to mitigate risks.
•The vulnerabilities could lead to Denial of Service and privilege escalation attacks.

Recent advisories from CISA confirm active exploitation of critical vulnerabilities in Debian's Dovecot and Flatpak packages. The vulnerabilities include a Denial of Service (DoS) flaw in Dovecot (CVE-2026-90616) and a privilege escalation and DoS issue in Linux. The Dovecot vulnerability was patched in version 1:2.4.1+dfsg1-6+deb13u7, while the Flatpak flaw was addressed in version 1.16.6-1~deb13u3. Debian users are urged to upgrade their packages immediately to mitigate risks. The vulnerabilities primarily affect the stable distribution 'trixie'. The advisories highlight the urgent need for system administrators to apply the patches to prevent potential exploitation.

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Timeline

2026-09-12

CVE-2026-90616 published

CVE-2026-90616, a Denial of Service vulnerability in Flatpak, was published.

2026-09-28

Dovecot patch released

Debian released a patch for Dovecot addressing critical vulnerabilities, urging users to upgrade.

2026-09-28

Flatpak patch released

Debian released a patch for Flatpak to fix the Denial of Service vulnerability, recommending upgrades.

2026-09-29

Linux patch released

A patch for critical privilege escalation and DoS vulnerabilities in Linux was released, urging immediate upgrades.

More articles in this cluster (3)

Threat Graph

5 entities, 4 inferred relationships (STIX 2.1).

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Technique (3)

Denial of Service
Privilege Escalation
T1068 - Exploitation for Privilege Escalation

Vulnerability (1)

CVE-2026-90616

Affected Platform (1)

Linux

Relationships

CVE-2026-90616 targets Linux
Denial of Service targets Linux
Privilege Escalation targets Linux
T1068 - Exploitation for Privilege Escalation targets Linux

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