Request Smuggling Vulnerability in Vinyl Cache and Varnish Cache
CVE-2026-50052

2.3LOW

Key Information:

Vendor

The Vinyl Cache Project

Status
Vinyl Cache
Varnish Cache (pre Split)
Varnish Cache By Varnish Software
Vendor
CVE Published:
3 June 2026

What is CVE-2026-50052?

A vulnerability present in Vinyl Cache prior to version 9.0.1 and Varnish Cache prior to version 9.0.3 allows attackers to exploit deficiencies in HTTP/2 request parsing, leading to potential backend request desynchronization attacks. This can result in numerous security issues including cache poisoning, authentication bypass, and in some cases, information disclosure and manipulation. Notably, the attack vector is only active when HTTP/2 support is enabled, which is not the default configuration.

Affected Version(s)

Varnish Cache (pre split) 7.6.0 <= 8.0.1

Varnish Cache (pre split) 6.0.14 <= 6.0.17

Varnish Cache by Varnish Software 9.0.0 <= 9.0.2

References

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

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.