7.5

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 repurposed as stream zero. During the upgrade, a buffer allocation is made to reserve space to send frames to the client. This allocation would split the original workspace, and depending on the amount of prefetched data, the next fetch could perform a pipelining operation that would run out of workspace.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Varnish-software ≫ Varnish Enterprise Version <= 6.0.15
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r1
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r10
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r2
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r3
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r4
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r5
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r6
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r7
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r8
Varnish-software ≫ Varnish Enterprise Version 6.0.16 Update r9
Vinyl-cache ≫ Vinyl Cache Version 9.0.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.24% 0.144
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
MITRE 4 2.2 1.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE-670 Always-Incorrect Control Flow Implementation

The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.

https://docs.varnish-software.com/security/VEV00002/
Vendor Advisory