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Mend.io Vulnerability Database
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CVE-2025-66506
Good to know:
Date: December 4, 2025
Fulcio is a free-to-use certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Prior to 1.8.3, function identity.extractIssuerURL splits (via a call to strings.Split) its argument (which is untrusted data) on periods. As a result, in the face of a malicious request with an (invalid) OIDC identity token in the payload containing many period characters, a call to extractIssuerURL incurs allocations to the tune of O(n) bytes (where n stands for the length of the function's argument), with a constant factor of about 16. This vulnerability is fixed in 1.8.3.
Severity Score
Related Resources (5)
Severity Score
Weakness Type (CWE)
Asymmetric Resource Consumption (Amplification)
CWE-405Top Fix
Upgrade Version
Upgrade to version github.com/sigstore/fulcio - v1.8.3;https://github.com/sigstore/fulcio.git - v1.8.3
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | NONE |
| Availability (A): | HIGH |