# CVE-2026-34964: Adminer before 5.5.0 SSRF via PDO DSN Injection

> Attackers can bypass port restrictions to perform server-side request forgery against internal hosts via the login form.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Aug 2026
- **Updated:** 26 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-34964, GHSA-58cq-mgw2-38m5, GHSA-5v92-397q-w6q6, UBUNTU-CVE-2026-34964

## What is CVE-2026-34964?

CVE-2026-34964 is a medium-severity server-side request forgery vulnerability in vrana adminer, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Adminer before 5.5.0 contains a server-side request forgery vulnerability in the login form's server field validator, which only inspects leading integers for privileged ports and fails to reject non-numeric port values. Attackers can inject PDO DSN keys like host= and port= into the server parameter to bypass the privileged-port restriction and establish TCP connections to arbitrary internal hosts and ports before authentication.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-34964?


## How do I fix CVE-2026-34964?

Upgrade to a fixed version.

## Is CVE-2026-34964 being exploited?

There is no known exploitation of CVE-2026-34964 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34964 and fix it if it is affected.

What it is: CVE-2026-34964 is a medium-severity server-side request forgery vulnerability in vrana adminer, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-34964 in the wild and no public exploit code.

Affected product: vrana adminer. 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-2026-34964/ (Markdown: https://insights.sbomify.com/CVE-2026-34964/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34964
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34964
- OSV: https://osv.dev/vulnerability/CVE-2026-34964

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34964/
Summaries are generated and may contain mistakes; the official description above is the record.