CVE-2026-50052

LOW

Vinyl Cache - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Title source: rule

Description

In Vinyl Cache before 9.0.1 and Varnish Cache before 9.0.3, a deficiency in HTTP/2 request parsing can be exploited to launch a backend request desync attack (request smuggling), which in turn can be used for cache poisoning, authentication bypass, or possibly even information disclosure and manipulation. The attack vector only exists if HTTP/2 support is enabled by setting the feature parameter to contain +http2. HTTP/2 support is disabled by default.

References (1)

Core 1

Core References

https://vinyl-cache.org/security/VSV00019.html

Scores

CVSS v4 2.3

EPSS 0.0032

EPSS Percentile 23.1%

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:N/R:A/V:D/RE:L/U:Green

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-444

Status published

Products (8)

The Vinyl Cache Project/Varnish Cache (pre split) 6.0.14 - 6.0.17

The Vinyl Cache Project/Varnish Cache (pre split) 6.0.18

The Vinyl Cache Project/Varnish Cache (pre split) 7.6.0 - 8.0.1

The Vinyl Cache Project/Varnish Cache (pre split) 8.0.2

The Vinyl Cache Project/Vinyl Cache 9.0.0

The Vinyl Cache Project/Vinyl Cache 9.0.1

Varnish Software/Varnish Cache by Varnish Software 9.0.0 - 9.0.2

Varnish Software/Varnish Cache by Varnish Software 9.0.3

Published Jun 03, 2026

Tracked Since Jun 03, 2026