CVE-2026-25534 Spinnaker clouddriver and orca URL validation bypass via underscores in hostnames

What is CVE-2026-25534?

CVE-2026-25534 is a critical server-side request forgery vulnerability in io.spinnaker.clouddriver clouddriver-artifacts, published on 17 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

### Impact Spinnaker updated URL Validation logic on user input to provide sanitation on user inputted URLs for clouddriver. However, they missed that Java URL objects do not correctly handle underscores on parsing. This led to a bypass of the previous CVE (CVE-2025-61916) through the use of carefully crafted URLs. Note, Spinnaker found this not just in that CVE, but in the existing URL validations in Orca fromUrl expression handling. This CVE impacts BOTH artifacts as a result.

### Patches This has been merged and will be available in versions 2025.4.1, 2025.3.1, 2025.2.4 and 2026.0.0.

### Workarounds You can disable the various artifacts on this system to work around these limits.

Weakness: CWE-918

Which versions are affected by CVE-2026-25534?

12 open source packages ship an affected version, including io.spinnaker.clouddriver:clouddriver-artifacts and io.spinnaker.orca:orca-core.

How do I fix CVE-2026-25534?

Upgrade io.spinnaker.clouddriver:clouddriver-artifacts to a fixed version for your release line: 2025.2.4, 2025.3.1 or 2025.4.1.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-25534 being exploited?

There is no known exploitation of CVE-2026-25534 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-8r8j-gfhg-fw38.