GNU SASL before 2.2.4 lacks sanitization of a short challenge in _gsasl_ntlm_client_step in the NTLM client, which could result in memory disclosure via a crafted server.
https://www.gnu.org/software/gsasl/
https://lists.gnu.org/archive/html/help-gsasl/2026-06/msg00000.html
https://lists.debian.org/debian-security-announce/2026/msg00259.html