SB2025121628 - Denial of service in Fulcio
Published: December 16, 2025
Security Bulletin ID
SB2025121628
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2025-66506)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources within the identity.extractIssuerURL() function when parsing untrusted arguments. A remote attacker can pass a specially crafted request with a malicious OIDC identity token to trigger resource exhaustion and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.