Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-25534 is a critical vulnerability in the Spinnaker platform affecting the Clouddriver and Orca components. It arises from improper URL validation logic that fails to correctly handle underscores in hostnames during URL parsing. This flaw is due to the underlying Java URL object's inability to properly parse underscores, allowing attackers to bypass previous URL validation protections."}, {'type': 'paragraph', 'content': "The vulnerability leads to Server-Side Request Forgery (SSRF), where attackers can craft malicious URLs that bypass security checks and potentially access unauthorized resources. It impacts both Clouddriver's user input sanitation and Orca's fromUrl expression handling."}] [1]

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can have serious impacts including high confidentiality loss, low integrity loss, and low availability loss. Attackers exploiting this flaw can bypass URL validation to perform SSRF attacks, potentially accessing unauthorized internal resources or sensitive data.

The attack vector is network-based with low complexity, requiring low privileges and no user interaction, but it causes a scope change affecting multiple components within Spinnaker.

Useful 0 Not Useful 0

Compliance Impact

I don't know

Useful 0 Not Useful 0

Detection Guidance

[{'type': 'paragraph', 'content': "This vulnerability arises from improper URL validation that fails to correctly handle underscores in hostnames during URL parsing in Spinnaker's Clouddriver and Orca components. Detection involves identifying attempts to use carefully crafted URLs containing underscores in hostnames that bypass URL validation."}, {'type': 'paragraph', 'content': 'Since the vulnerability is related to URL parsing and validation, monitoring logs for URLs with underscores in hostnames or unusual URL patterns in requests to Clouddriver or Orca components can help detect exploitation attempts.'}, {'type': 'paragraph', 'content': 'Specific commands are not provided in the available resources, but general approaches include:'}, {'type': 'list_item', 'content': 'Inspect application logs for URLs containing underscores in hostnames.'}, {'type': 'list_item', 'content': 'Use network monitoring tools (e.g., tcpdump, Wireshark) to capture HTTP requests to Spinnaker services and filter for URLs with underscores.'}, {'type': 'list_item', 'content': "Search logs or captured traffic with commands like: `grep -r '_.' /path/to/spinnaker/logs` to find URLs with underscores."}, {'type': 'list_item', 'content': 'Use custom scripts or tools to parse URLs in logs and flag those with underscores in hostnames.'}] [1]

Useful 0 Not Useful 0

Mitigation Strategies

Immediate mitigation steps include applying the patches released for this vulnerability or using available workarounds until patches can be applied.

• Upgrade Spinnaker to one of the patched versions: 2025.3.1, 2025.4.1, 2025.2.4, 2026.0.0, or later releases.
• As a temporary workaround, disable the affected artifact components (Clouddriver and Orca artifacts) on the system to prevent exploitation.

These steps help prevent attackers from exploiting the URL validation bypass caused by underscores in hostnames.

Useful 0 Not Useful 0