CVE-2025-54799

Description

Let's Encrypt client and ACME library written in Go (Lego). In versions 4.25.1 and below, the github.com/go-acme/lego/v4/acme/api package (thus the lego library and the lego cli as well) don't enforce HTTPS when talking to CAs as an ACME client. Unlike the http-01 challenge which solves an ACME challenge over unencrypted HTTP, the ACME protocol requires HTTPS when a client communicates with the CA to performs ACME functions. However, the library fails to enforce HTTPS both in the original discover URL (configured by the library user) and in the subsequent addresses returned by the CAs in the directory and order objects. If users input HTTP URLs or CAs misconfigure endpoints, protocol operations occur over HTTP instead of HTTPS. This compromises privacy by exposing request/response details like account and request identifiers to network attackers. This was fixed in version 4.25.2.

Reserved 2025-07-29 | Published 2025-08-07 | Updated 2025-08-07 | Assigner GitHub_M

Problem types

CWE-319: Cleartext Transmission of Sensitive Information

Product status

< 4.25.2
affected

References

github.com/...e/lego/security/advisories/GHSA-q82r-2j7m-9rv4

github.com/...ommit/238454b5f74f3cfcbb244ff0d0dc914a4ad44b96

cve.org (CVE-2025-54799)

nvd.nist.gov (CVE-2025-54799)

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