CVE-2026-32952mediumCWE-190

CVE-2026-32952: medium-severity vulnerability in Azure go-ntlmssp

go-ntlmssp NTLM challenges can panic on malformed payloads

Published

Follow this CVE+ Monitor go-ntlmssp+ Monitor rclone

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.3epss 1.0%
In short

The go-ntlmssp package can crash when it receives a specially crafted NTLM authentication message. An attacker can exploit this to disable services that use this library for authentication.

Technical detail

A malformed NTLM challenge message triggers an out-of-bounds slice access in ntlmssp.Negotiator, causing a panic that crashes the Go process. The attack requires network access to send a malicious challenge during NTLM authentication handshake; no authentication is required beforehand. The impact is denial of service affecting any application using this library for HTTP authentication.

Summary generated and translated by AI from the official description.
go-ntlmssp is a Go package that provides NTLM/Negotiate authentication over HTTP. Prior to version 0.1.1, a malicious NTLM challenge message can causes an slice out of bounds panic, which can crash any Go process using `ntlmssp.Negotiator` as an HTTP transport. Version 0.1.1 patches the issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
Azure · go-ntlmssp