# CVE-2026-50052: Other in Varnish Cache (pre split)

> Attackers can exploit HTTP/2 request parsing flaws to perform request smuggling, leading to cache poisoning, authentication bypass, or information disclosure.

- **Severity:** Low 2.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 3 Jun 2026
- **Updated:** 1 Jul 2026
- **Also known as:** DEBIAN-CVE-2026-50052, GHSA-mwjg-3fm6-9v84, UBUNTU-CVE-2026-50052, openSUSE-SU-2026:11039-1

## What is CVE-2026-50052?

CVE-2026-50052 is a low-severity vulnerability in The Vinyl Cache Project Varnish Cache (pre split), published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-444 (Inconsistent Interpretation of HTTP Requests)

## Which versions are affected by CVE-2026-50052?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `vinyl-cache` | openSUSE:Tumbleweed | All versions | 9.0.1-1.1 |

## How do I fix CVE-2026-50052?

Upgrade to a fixed version.

## Is CVE-2026-50052 being exploited?

There is no known exploitation of CVE-2026-50052 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-50052 and fix it if it is affected.

What it is: CVE-2026-50052 is a low-severity vulnerability in The Vinyl Cache Project Varnish Cache (pre split), published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-50052 in the wild and no public exploit code.

Affected product: The Vinyl Cache Project Varnish Cache (pre split). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-50052/ (Markdown: https://insights.sbomify.com/CVE-2026-50052/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-50052
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-50052
- OSV: https://osv.dev/vulnerability/CVE-2026-50052

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-50052/
Summaries are generated and may contain mistakes; the official description above is the record.