Detections
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SCA: security update for github.com/sigstore/fulcio (GHSA-f83f-xpx7-ffpw)

high Tenable Self-Hosted Container Security Plugin ID 436266

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2025-66506)

See Also

https://github.com/advisories/GHSA-f83f-xpx7-ffpw

Plugin Details

Severity: High

ID: 436266

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 12/5/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-66506

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 12/5/2025

Vulnerability Publication Date: 12/4/2025

Reference Information

CVE: CVE-2025-66506

cwe: CWE-405