Net CVE-2026-39836

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EUVD

EUVD-2026-28427 HIGH

NULL Pointer Dereference (CWE-476)

2026-05-07 Go

GHSA-8g2r-hhvj-mv99

Denial Of Service Null Pointer Dereference Microsoft Net Go Standard Library

7.5

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness

CWE

OWASP Top 10:2025

A10:2025 - Mishandling of Exceptional Conditions

ASVS 5.0

V16 - Security Logging and Error Handling Null pointer safety, defensive checks

MITRE ATT&CK

1 technique across 1 tactic: Impact

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 23, 2026

Denial of service in the Go standard library's net package (on Windows) allows remote attackers to crash applications by supplying host or port inputs containing an embedded NUL (0) byte, which triggers a nil pointer dereference and panic in the Dial and LookupPort functions. Affected releases are net versions below 1.25.10 and 1.26.0 through 1.26.2, with publicly available exploit code but no evidence of active exploitation (EPSS 0.01%). Impact is limited to availability — a crashed process or goroutine — with no confidentiality or integrity effect.

Affected VersionsENISA

net 0 <1.25.10

net 1.26.0-0 <1.26.3

Affected Packages

go stdlib fix: 1.25.10, 1.26.3

euvd net fix: 1.25.10, 1.26.3

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in go, euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SUSE HIGH

Red Hat 7.5 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

4

CVSS changed

May 08, 2026 - 22:22 NVD

7.5 (HIGH)

Patch available

May 07, 2026 - 21:02 EUVD

CVE Published

May 07, 2026 - 19:41 nvd

HIGH 7.5

CVE Published

May 07, 2026 - 19:41 nvd

UNKNOWN (no severity yet)

DescriptionNVD

The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).

Executive ViewAI

Why It Matters

The Go standard library's net package (versions 1.25.9 and below, 1.26.0-1.26.2) contains a denial-of-service vulnerability allowing remote attackers to crash Windows-based Go applications. While publicly available exploit code exists, active exploitation remains unreported; however, organizations with Go services on Windows should prioritize remediation to protect service availability.

Recommended Action

Within 24 hours, audit all Go deployments on Windows systems and document current runtime versions to identify affected installations. Within 7 days, upgrade to Go 1.25.10 or later, or Go 1.26.3 or later, prioritizing production environments. Within 30 days, validate patch deployment across all systems and confirm that Dial and LookupPort functions operate normally under production load.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.0%

Top 99% exploitable

Exploit

POC

Public exploit code exists

Data Quality

8 sources

Confidence: High

EUVD

CVE.org

EPSS

Vulnrichment MSRC Vendor

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

Yes

Human Impact

High

Technical Impact

Partial

Priority Score

58

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Null Pointer Dereference MEDIUM

A null pointer dereference occurs when a program attempts to access memory through a pointer that has been set to NULL (address 0x0).

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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Vendor StatusVendor

SUSE

Severity: High

Product	Status
openSUSE Tumbleweed	Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS	Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS	Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS	Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS	Affected

References

Advisories & patches

ADVISORY https://access.redhat.com/errata/RHSA-2026:23262 ADVISORY https://access.redhat.com/errata/RHSA-2026:23264 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-39836 ADVISORY https://vuldb.com/vuln/361955 REF https://go.dev/cl/775320 REF https://go.dev/issue/79006 REF https://groups.google.com/g/golang-announce/c/qcCIEXso47M REF https://pkg.go.dev/vuln/GO-2026-4971

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