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Critical Rsyslog Vulnerabilities Lead to Denial of Service Risks

Critical Rsyslog Vulnerabilities Lead to Denial of Service Risks

First seen 24 Jul 2026, 03:31 UTC • •
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ThreatCluster AI
ThreatCluster •July 25, 2026 at 01:49 UTC
  • •Two critical vulnerabilities in rsyslog could lead to denial of service.
  • •Affected systems include Ubuntu 26.04, 24.04, and 22.04 LTS.
  • •Users are urged to update their systems to mitigate risks.

Two critical vulnerabilities were discovered in rsyslog, affecting multiple Ubuntu versions. The issues involve improper handling of regex-based TCP framing and oversized RFC5424 structured data, both leading to potential denial of service attacks. These vulnerabilities could allow remote attackers to crash the rsyslog service, impacting system logging capabilities. The vulnerabilities have been assigned CVE-2026-61548. Users are advised to update their systems to mitigate these risks. Ubuntu Pro offers ten-year security coverage for affected packages. The vulnerabilities were disclosed on July 23, 2026, and are considered critical due to their potential impact on system availability.

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Updated 55d ago How this analysis works

Timeline

2026-07-23
Rsyslog vulnerabilities disclosed
Two vulnerabilities in rsyslog were reported, potentially allowing remote attackers to crash the service, affecting system logging.
Ubuntu
2026-07-23
Security advisory issued
Linuxsecurity published an advisory detailing the critical denial of service vulnerabilities in rsyslog.
Linuxsecurity

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Extracted Entities (4)

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