๐Ÿ›ก๏ธ CVE-2025-66506
๐ŸŸ  CVSS 8.0 โ€” High โœ… No Known Exploit CWE-405 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-405
Public Exploit โœ… No
Source NVD
Published 2025-12-04
Updated 2026-06-15
Modified 2026-03-10

Affected Packages

Software From version Fixed in
fulcio โ€” 1.8.3
github.com/sigstore/fulcio โ€” โ€”

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