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Vulnerability · Published Apr 24, 2026 · Assigned by GitHub_M

CVE-2026-32952go-ntlmssp NTLM challenges can panic on malformed payloads

Medium 5.3

In plain English

A medium-severity integer overflow in go-ntlmssp from Azure. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)1.0%top 36.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24rclone1.74.0-r0ALPINE-CVE-2026-32952
Debian:12golang-github-azure-go-ntlmsspno fix listedDEBIAN-CVE-2026-32952
Debian:13golang-github-azure-go-ntlmsspno fix listedDEBIAN-CVE-2026-32952
Debian:14golang-github-azure-go-ntlmsspno fix listedDEBIAN-CVE-2026-32952
Gogithub.com/Azure/go-ntlmssp0.1.1GO-2026-5543
Gogithub.com/Azure/go-ntlmssp0.1.1GHSA-pjcq-xvwq-hhpj
Ubuntu:22.04:LTSgolang-github-azure-go-ntlmsspno fix listedUBUNTU-CVE-2026-32952
Ubuntu:24.04:LTSgolang-github-azure-go-ntlmsspno fix listedUBUNTU-CVE-2026-32952
Ubuntu:25.10golang-github-azure-go-ntlmsspno fix listedUBUNTU-CVE-2026-32952
Ubuntu:26.04:LTSgolang-github-azure-go-ntlmsspno fix listedUBUNTU-CVE-2026-32952
Ubuntu:26.10golang-github-azure-go-ntlmsspno fix listedUBUNTU-CVE-2026-32952

Affected products (as reported)

VendorProductVersions
Azure go-ntlmssp < 0.1.1

Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References