CVE-2026-50052

Severity CVSS v4.0:

LOW

Type:

Unavailable / Other

Publication date:

03/06/2026

Last modified:

03/06/2026

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<br /> attack (request smuggling), which in turn can be used for cache poisoning,<br /> authentication bypass, or possibly even information disclosure and manipulation. The attack vector only exists if HTTP/2 support is enabled by setting the<br /> feature parameter to contain +http2. HTTP/2 support is disabled by<br /> default.

Impact

Vector 4.0

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/S:N/AU:N/R:A/V:D/RE:L/U:Green CVSS v4.0 Severity and Metrics:

Base Score: 2.30 LOW
Vector: 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/S:N/AU:N/R:A/V:D/RE:L/U:Green

Attack Vector (AV): Network
Attack Complexity (AC): High
Attack Requirements (AT): Present
Privileges Required (PR): None
User Interaction (UI): Passsive
Confidentiality (VC): Low
Integrity (VI): None
Availability (VA): None
Confidentiality (SC): Low
Integrity (SI): None
Availability (SA): None
Safety (S): Negligible
Automatable (AU): No
Recovery (R): Automatic
Value Density (V): Diffuse
Vulnerability Response Effort (RE): Low
Provider Urgency (U): Green

Base Score 4.0

2.30

Severity 4.0

LOW

References to Advisories, Solutions, and Tools

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