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Debian Varnish Cache Vulnerabilities Prompt Urgent Security Update

Debian Varnish Cache Vulnerabilities Prompt Urgent Security Update

First seen 26 Oct 2026, 07:10 UTC • •
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ThreatCluster AI
ThreatCluster •October 26, 2026 at 07:41 UTC
  • •Two critical vulnerabilities in Varnish Cache require immediate attention.
  • •CVE-2026-34475 can lead to denial of service through a buffer overflow.
  • •CVE-2026-93894 poses risks of cache poisoning and authentication bypass.

Debian has released a security update addressing two vulnerabilities in Varnish Cache, identified as CVE-2026-34475 and CVE-2026-93894. CVE-2026-34475 involves a buffer overflow that could lead to denial of service, while CVE-2026-93894 allows for potential cache poisoning and authentication bypass through unchecked HTTP requests. These vulnerabilities affect the stable distribution of Debian, specifically version 7.7.0-3+deb13u2. Users are urged to upgrade their Varnish packages immediately to mitigate the risks. The vulnerabilities were publicly disclosed, with CVE-2026-34475 having a proof-of-concept released on April 30, 2026. The issues primarily impact systems using Varnish Cache in configurations that allow for the exploitation of these flaws. Current status indicates that patches are available and should be applied without delay.

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Timeline

2026-03-27
CVE-2026-34475 published
Buffer overflow vulnerability discovered in Varnish Cache, allowing potential denial of service.
Linuxsecurity
2026-09-18
CVE-2026-93894 published
Vulnerability allowing cache poisoning and authentication bypass disclosed.
Linuxsecurity
2026-10-25
Debian releases security update
Debian updates Varnish Cache to version 7.7.0-3+deb13u2 to address the vulnerabilities.
Linuxsecurity

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Common questions

What versions of Varnish Cache are affected?
The vulnerabilities affect the stable distribution of Debian, specifically Varnish Cache version 7.7.0-3+deb13u2.
How urgent is the patch?
The patch is urgent as it addresses critical vulnerabilities that could lead to denial of service and cache poisoning.
What steps should I take to mitigate these vulnerabilities?
Upgrade your Varnish packages to the latest version immediately to protect against these vulnerabilities.