SB2026041648 - Cleartext transmission of sensitive information in lego
Published: April 16, 2026
Security Bulletin ID
SB2026041648
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Cleartext transmission of sensitive information (CVE-ID: CVE-2025-54799)
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper transport security enforcement in github.com/go-acme/lego/v4/acme/api when communicating with ACME certificate authority endpoints. A remote attacker can intercept unencrypted ACME requests and responses to disclose sensitive information.
The issue can be triggered if the library user supplies an HTTP discovery URL or if a certificate authority returns HTTP endpoint URLs in directory or order objects.
Remediation
Install update from vendor's website.