EUVD-2026-21742

Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service daemon panic after timeoutlinger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread timeoutlinger and resume traffic before the session is closed timeoutidle...

EUVD-2026-21738

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service daemon panic for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is...

CVE-2026-40396

Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service daemon panic after timeoutlinger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread timeoutlinger and resume traffic before the session is closed timeoutidle...

CVE-2026-40394

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service daemon panic for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is...

DEBIAN-CVE-2026-40394

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service daemon panic for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is...

CVE-2026-40394

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service daemon panic for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is...

CVE-2026-40396

Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service daemon panic after timeoutlinger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread timeoutlinger and resume traffic before the session is closed timeoutidle...

UBUNTU-CVE-2026-40394

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service daemon panic for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is...

UBUNTU-CVE-2026-40396

Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service daemon panic after timeoutlinger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread timeoutlinger and resume traffic before the session is closed timeoutidle...

CVE-2026-40396

Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service daemon panic after timeoutlinger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread timeoutlinger and resume traffic before the session is closed timeoutidle...

CVE-2026-40396

Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service daemon panic after timeoutlinger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread timeoutlinger and resume traffic before the session is closed timeoutidle...

CVE-2026-40396

Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service daemon panic after timeoutlinger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread timeoutlinger and resume traffic before the session is closed timeoutidle...

CVE-2026-40396

Varnish Cache 9 prior to 9.0.1 is affected by a workspace overflow DoS (daemon panic) that can be triggered by a malicious HTTP/1 request sequence: after timeout_linger releases a worker thread, resuming traffic with multiple requests before the session closes (timeout_idle) can cause a pipelinin...

CVE-2026-40396

Varnish Cache 9 before 9.0.1 allows a "workspace overflow" denial of service daemon panic after timeoutlinger. A malicious client could send an HTTP/1 request, wait long enough until the session releases its worker thread timeoutlinger and resume traffic before the session is closed timeoutidle...

CVE-2026-40394

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service daemon panic for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is...

CVE-2026-40394

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service daemon panic for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is...

CVE-2026-40394

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service daemon panic for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is...

CVE-2026-40394

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 allows a "workspace overflow" denial of service daemon panic for certain amounts of prefetched data. The setup of an HTTP/2 session starts with a speculative HTTP/1 transport, and upon upgrading to h2 the HTTP/1 request is...

CVE-2026-40394

Varnish Cache 9 before 9.0.1 and Varnish Enterprise before 6.0.16r11 are affected by a workspace overflow during HTTP/2 session upgrade. The vulnerability arises when the HTTP/2 upgrade path repurposes an HTTP/1 request as stream zero and allocates a buffer to reserve space for frames, which can ...

PT-2026-32183

Name of the Vulnerable Software and Affected Versions Varnish Cache versions prior to 9.0.1 Varnish Enterprise versions prior to 6.0.16r11 Description Varnish Cache and Varnish Enterprise are susceptible to a denial of service daemon panic due to a workspace overflow. This occurs when handling...