sigstore/fulcio · Security
Fulcio allocates excessive memory during token parsing
- GHSA ID
- GHSA-f83f-xpx7-ffpw
- CVE ID
- CVE-2025-66506
- Severity
- high
- Published
- Updated
- CVSS
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v3
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
Function identity.extractIssuerURL currently 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. Relevant weakness: CWE-405: Asymmetric Resource Consumption (Amplification)
Details See identity.extractIssuerURL
Impact Excessive memory allocation
CWEs
- CWE-405 · Asymmetric Resource Consumption (Amplification)