SB2026041648 - Cleartext transmission of sensitive information in lego

Description

This security bulletin contains information about 1 vulnerability.

1) Cleartext transmission of sensitive information (CVE-ID: CVE-2025-54799)

CWE-ID: CWE-319 - Cleartext Transmission of Sensitive Information

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

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.

References

• https://github.com/go-acme/lego/security/advisories/GHSA-q82r-2j7m-9rv4
• https://github.com/advisories/GHSA-q82r-2j7m-9rv4