CVE-2026-32952: go-ntlmssp is a Go package that provides NTLM/Negotiate authentication over HTTP

Q: How do I fix CVE-2026-32952?

go-ntlmssp: upgrade to 0.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-32952 being exploited?

CVE-2026-32952 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-32952 affect?

CVE-2026-32952 affects go-ntlmssp. Severity is medium (CVSS 5.3). 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`

Q: How urgent is CVE-2026-32952?

Priority 44/100. Remotely exploitable, no login, no user action; On your watchlist

This month

MEDIUM 5.3REMOTEWATCHLISTUPGRADE

CVE-2026-32952 is a medium-severity flaw (CVSS 5.3) affecting go-ntlmssp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-04-24
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: microsoft

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-24 03:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

microsoft go-ntlmssp UPGRADE

Affected: < 0.1.1

Fixed in: 0.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy go-ntlmssp || rpm -q go-ntlmssp || go-ntlmssp --version

2. UPGRADE to 0.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade go-ntlmssp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade go-ntlmssp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-32952?

go-ntlmssp: upgrade to 0.1.1. Exact commands for each OS are on this page.

Is CVE-2026-32952 being exploited?

CVE-2026-32952 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-32952 affect?

CVE-2026-32952 affects go-ntlmssp. Severity is medium (CVSS 5.3). 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`

How urgent is CVE-2026-32952?

Priority 44/100. Remotely exploitable, no login, no user action; On your watchlist

References

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