# CVE-2026-93649: Open redirect in Adoptium Temurin

> Attackers can trick users into downloading malicious binaries by bypassing URL validation on the Eclipse Adoptium download page via path traversal in query parameters.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-5w25-6xp6-x3fm, GHSA-f228-m952-5r6w

## What is CVE-2026-93649?

CVE-2026-93649 is a high-severity vulnerability in Eclipse Foundation Adoptium Temurin, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the Eclipse Adoptium website (adoptium.net), in every deployment built from commit 0b24ea1 (2025-06-18) up to the fix in commit cbb53cf (2026-09-24), the post-download page /[locale]/download takes a download URL from the "link" query parameter and automatically navigates to it with a meta http-equiv="refresh". The URL is checked against a list of trusted prefixes using String.startsWith() on the raw string, while the browser applies RFC 3986 dot-segment normalisation before navigating, so a value such as https://github.com/adoptium/temurin/../../attacker/malware/releases/download/v1/jdk.exe passes the check but resolves to an attacker-controlled repository. A victim who follows a crafted adoptium.net link is shown the genuine "Thank you for downloading Eclipse Temurin" page while their browser downloads a binary of the attacker's choosing

Weakness: CWE-601 (URL Redirection to Untrusted Site), CWE-494 (Download of Code Without Integrity Check)

## Which versions are affected by CVE-2026-93649?


## How do I fix CVE-2026-93649?

No fix has been published for CVE-2026-93649 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93649 being exploited?

There is no known exploitation of CVE-2026-93649 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93649 and fix it if it is affected.

What it is: CVE-2026-93649 is a high-severity vulnerability in Eclipse Foundation Adoptium Temurin, published on 15 Oct 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-2026-93649 in the wild and no public exploit code.

Affected product: Eclipse Foundation Adoptium Temurin. 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-2026-93649/ (Markdown: https://insights.sbomify.com/CVE-2026-93649/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93649
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93649
- OSV: https://osv.dev/vulnerability/CVE-2026-93649

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-93649/
Summaries are generated and may contain mistakes; the official description above is the record.