---
title: "CVE-2026-25534: Spinnaker clouddriver and orca URL validation bypass via underscores in hostnames"
url: https://erroneo.us/security/cve/CVE-2026-25534/
description: "CVE-2026-25534 (io.spinnaker.clouddriver:clouddriver-artifacts (Maven)): Impact Spinnaker updated URL Validation logic on user input to provide sanitation…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-17
date_modified: 2026-09-01
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-25534"
kev: false
cvss: 9.1
epss: 0.00421
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 35: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 35% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes io.spinnaker.clouddriver:clouddriver-artifacts (Maven) >= 2025.3.0, < 2025.3.1, fixed in 2025.3.1 ; io.spinnaker.clouddriver:clouddriver-artifacts (Maven) >= 2025.4.0, < 2025.4.1, fixed in 2025.4.1 ; io.spinnaker.orca:orca-core (Maven) >= 2025.3.0, < 2025.3.1, fixed in 2025.3.1 ; io.spinnaker.orca:orca-core (Maven) >= 2025.4.0, < 2025.4.1, fixed in 2025.4.1 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Maven `io.spinnaker.clouddriver:clouddriver-artifacts` >= 2025.3.0, < 2025.3.1 → fixed: 2025.3.1
- Maven `io.spinnaker.clouddriver:clouddriver-artifacts` >= 2025.4.0, < 2025.4.1 → fixed: 2025.4.1
- Maven `io.spinnaker.orca:orca-core` >= 2025.3.0, < 2025.3.1 → fixed: 2025.3.1
- Maven `io.spinnaker.orca:orca-core` >= 2025.4.0, < 2025.4.1 → fixed: 2025.4.1
- Maven `io.spinnaker.clouddriver:clouddriver-artifacts` >= 2025.1.6, < 2025.2.4 → fixed: 2025.2.4
- Maven `io.spinnaker.orca:orca-core` >= 2025.1.6, < 2025.2.4 → fixed: 2025.2.4

## Affected products (CVE record)

- io.spinnaker.clouddriver clouddriver-artifacts: < 2025.2.4, >= 2025.3.0, < 2025.3.1, >= 2025.4.0, < 2025.4.1
- io.spinnaker.orca orca-core: < 2025.2.4, >= 2025.3.0, < 2025.3.1, >= 2025.4.0, < 2025.4.1

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.42% probability of exploitation activity in the next 30 days; percentile 35.

## Sources

- [GitHub Advisory GHSA-8r8j-gfhg-fw38](https://github.com/advisories/GHSA-8r8j-gfhg-fw38)
- [CVE.org record CVE-2026-25534](https://www.cve.org/CVERecord?id=CVE-2026-25534)
- [NVD entry CVE-2026-25534](https://nvd.nist.gov/vuln/detail/CVE-2026-25534)
- [github.com](https://github.com/spinnaker/spinnaker/security/advisories/GHSA-8r8j-gfhg-fw38)
- [github.com](https://github.com/spinnaker/spinnaker/security/advisories/GHSA-vrjc-q2fh-6x9h)
- [github.com](https://github.com/spinnaker/spinnaker/commit/7c4737906239a958a468e843239c6785b03d0eda)

---
Source page: https://erroneo.us/security/cve/CVE-2026-25534/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt