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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.

PUBLISHED Reserved 2026-06-03 | Published 2026-06-03 | Updated 2026-06-03 | Assigner mitre




LOW: 2.3CVSS: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

Problem types

CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Product status

Default status
unaffected

9.0.0
affected

9.0.1
unaffected

Default status
unaffected

7.6.0 (semver)
affected

8.0.2
unaffected

6.0.14 (semver)
affected

6.0.18
unaffected

Default status
unaffected

9.0.0 (semver)
affected

9.0.3
unaffected

References

vinyl-cache.org/security/VSV00019.html

cve.org (CVE-2026-50052)

nvd.nist.gov (CVE-2026-50052)

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