CVE-2025-66506

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Source
https://cve.org/CVERecord?id=CVE-2025-66506
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66506.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-66506
Aliases
Downstream
Related
Published
2025-12-04T22:04:41.637Z
Modified
2026-08-12T03:51:12.289891256Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Fulcio allocates excessive memory during token parsing
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-405"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66506.json"
}
References

Affected packages

Git / github.com/sigstore/fulcio

Affected ranges

Type
GIT
Repo
https://github.com/sigstore/fulcio
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
3622f6e62cf74ff1477422a8c3aad4ca338ed047
Fixed
765a0e57608b9ef390e1eeeea8595b9054c63a5a
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.8.3"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:linuxfoundation:fulcio:*:*:*:*:*:*:*:*"
}

Affected versions

0.*
0.1.0
v0.*
v0.1.1
v0.2.0
v0.3.0
v0.4.0
v0.4.1
v0.5.0
v0.5.1
v0.5.2
v0.5.3
v0.5.4
v0.6.0
v1.*
v1.0.0
v1.0.0-rc.0
v1.1.0
v1.2.0
v1.3.0
v1.3.1
v1.3.2
v1.3.3
v1.3.4
v1.4.0
v1.4.1
v1.4.2
v1.4.3
v1.4.4
v1.4.5
v1.5.0
v1.5.1
v1.6.0
v1.6.1
v1.6.2
v1.6.3
v1.6.4
v1.6.5
v1.6.6
v1.7.0
v1.7.1
v1.8.0
v1.8.1
v1.8.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66506.json"