Bug 2399533

Summary: CVE-2025-47906 mkcert: Unexpected paths returned from LookPath in os/exec [fedora-42]
Product: [Fedora] Fedora Reporter: Jon Moroney <jmoroney>
Component: mkcertAssignee: Dick Marinus <dick>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 42CC: dick, go-sig
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["82b592f6-3fef-4109-80a1-8023edc09049"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2025-09-26 11:06:38 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2396546    

Description Jon Moroney 2025-09-26 00:36:07 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Comment 1 Dick Marinus 2025-09-26 11:06:38 UTC 
Seems like mkcert isn't vulnerable, I checked the usage of "LookPath" and it isn't possible to inject . or .. into the LookPath call.

Besides that, mkcert is meant to be used locally by the system administrator. I can't think of a way how this could even be exploitable by a non administrator.

$ git grep -i lookpath
main.go:        _, err := exec.LookPath(name)
truststore_nss.go:                      certutilPath, _ = exec.LookPath("certutil")
truststore_nss.go:                      certutilPath, _ = exec.LookPath("certutil")

$ git grep -i binaryExists
main.go:func binaryExists(name string) bool {
main.go:        if !binaryExists("sudo") {
truststore_linux.go:    case binaryExists("apt"):
truststore_linux.go:    case binaryExists("yum"):
truststore_linux.go:    case binaryExists("zypper"):
truststore_nss.go:              case binaryExists("certutil"):
truststore_nss.go:              case binaryExists("/usr/local/opt/nss/bin/certutil"):
truststore_nss.go:              if hasCertutil = binaryExists("certutil"); hasCertutil {