telnet in GNU inetutils through 2.7 allows servers to read arbitrary environment variables from clients via NEW_ENVIRON SEND USERVAR.
https://www.openwall.com/lists/oss-security/2026/03/13/1
Source: Mitre, NVD
Published: 2026-03-13
Base Score: 2.6
Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:N/A:N
Severity: Low
Base Score: 3.4
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N