Denial Of Service (DoS)

github.com/sigstore/fulcio is vulnerable to Denial of Service DoS. The vulnerability is due to inefficient handling of untrusted input in the extractIssuerURL function, which allows an attacker to supply a token with excessive period characters to trigger high memory allocations and degrade servi...

Medium: runfinch-finch

Issue Overview: SSH Agent servers do not validate the size of messages when processing new identity requests, which may cause the program to panic if the message is malformed due to an out of bounds read. CVE-2025-47914 SSH servers parsing GSSAPI authentication requests do not validate the number...

CVE-2025-66506

A flaw was found in Fulcio, a free-to-use certificate authority. This vulnerability allows a denial of service DoS due to excessive memory allocation when processing a malicious OpenID Connect OIDC identity token containing numerous period characters...

GHSA-F83F-XPX7-FFPW Fulcio allocates excessive memory during token parsing

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...

EUVD-2025-201293

Fulcio allocates excessive memory during token parsing...

Fulcio allocates excessive memory during token parsing

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...

CVE-2025-66506

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...

DEBIAN-CVE-2025-66506

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...

UBUNTU-CVE-2025-66506

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...

CVE-2025-66506

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...

CVE-2025-66506 Fulcio allocates excessive memory during token parsing

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...

CVE-2025-66506

CVE-2025-66506 affects Fulcio prior to 1.8.3. The identity.extractIssuerURL function splits the untrusted OIDC identity token on periods, which can incur O(n) memory allocations when receiving tokens with many dots. This could lead to resource consumption under malicious input. The issue is fixed...

PT-2025-49168

Name of the Vulnerable Software and Affected Versions Fulcio versions prior to 1.8.3 Description Fulcio is a certificate authority for issuing code signing certificates for OpenID Connect OIDC identity. The identity.extractIssuerURL function splits its input, which is untrusted data, on periods. ...