Detections
Analytics

SCA: security update for github.com/sigstore/fulcio (GHSA-f5mr-q85p-6hh6)

high Tenable Cloud Security Plugin ID 444132

Description

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

 - Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC)
 identity. Versions through 1.8.5 improperly follow cross-host redirects and attach Kubernetes
 ServiceAccount tokens during OIDC discovery, allowing a malicious or compromised issuer to perform blind
 SSRF, substitute and cache malicious JWKS keys, or disclose ServiceAccount tokens to external hosts.
 Version 1.8.6 blocks cross-host redirects, restricts token injection, and restricts local token loading.
 No known workarounds are available. (CVE-2026-49478)

Solution

Update the github.com/sigstore/fulcio library and its related packages to version 1.8.6 or later.

See Also

https://github.com/advisories/GHSA-f5mr-q85p-6hh6

Plugin Details

Severity: High

ID: 444132

Version: Revision 1.3

Type: Local

Family: SCA Checks

Published: 6/30/2026

Updated: 8/14/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.8

Percentile: 57.81

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.3

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

CVSS Score Source: CVE-2026-49478

CVSS v3

Risk Factor: High

Base Score: 8.7

Temporal Score: 7.6

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/30/2026

Vulnerability Publication Date: 6/30/2026

Reference Information

CVE: CVE-2026-49478

cwe: CWE-918