https://seclists.org/oss-sec/2026/q3/8: Vinyl Cache / Varnish Cache HTTP/2 parsing deficiency [CVE-2026-50052]
Published Jul 1, 2026
·Updated
Affected Software
2 affected components
Vinyl Cache Vinyl Cache>=9.0.0<9.0.1
Varnish Software Varnish Cache<=9.0.2, >=7.6.0<=8.0.1, >=6.0.14<=6.0.17
Frequently Asked Questions
1
What is the severity of CVE-2026-50052?
CVE-2026-50052 has been classified with a high severity due to its potential for request smuggling and cache poisoning.
2
How do I fix CVE-2026-50052?
To fix CVE-2026-50052, update your Vinyl Cache or Varnish Cache software to the latest version that addresses this vulnerability.
3
What systems are affected by CVE-2026-50052?
CVE-2026-50052 affects both Vinyl Cache and Varnish Cache installations using HTTP/2.
4
What kind of attacks can CVE-2026-50052 facilitate?
CVE-2026-50052 can be exploited to perform backend request desynchronization attacks, leading to cache poisoning.
5
When was CVE-2026-50052 first published?
CVE-2026-50052 was first published on May 18, 2026.