Information Exposure Through Timing Discrepancy in otp - CVE-2026-48859
Published: July 2, 2026
Vulnerability identifier: #VU136822
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: CVE-2026-48859
CWE-ID: CWE-208
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: erlang
Affected software:
otp
otp
Detailed vulnerability description
The vulnerability allows a remote attacker to enumerate valid usernames.
The vulnerability exists due to observable timing discrepancy in ssh_auth:check_password/3 when processing SSH password authentication with the user_passwords option. A remote attacker can send a password authentication attempt to enumerate valid usernames.
Only systems using the user_passwords or password option for SSH daemon password authentication are vulnerable.
How to mitigate CVE-2026-48859
Install security update from vendor's website.