VDB-361955 · CVE-2026-39836 · EUVD-2026-28427

net up to 1.25.9/1.26.2 on Go Dial/LookupPort uncaught exception

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic has been found in net up to 1.25.9/1.26.2 on Go. Affected by this vulnerability is the function Dial/LookupPort. The manipulation leads to uncaught exception. This vulnerability is referenced as CVE-2026-39836. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in net up to 1.25.9/1.26.2 on Go. This issue affects the function Dial/LookupPort. The manipulation with an unknown input leads to a uncaught exception vulnerability. Using CWE to declare the problem leads to CWE-248. An exception is thrown from a function, but it is not caught. Impacted is availability. The summary by CVE is:

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

It is possible to read the advisory at go.dev. The identification of this vulnerability is CVE-2026-39836 since 04/07/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 315061 (SUSE SLED15 / SLES15 Security Update : go1.25 (SUSE-SU-2026:1862-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.25.10 or 1.26.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (315061), EUVD (EUVD-2026-28427) and CERT Bund (WID-SEC-2026-1437). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

Splunk Splunk Enterprise
Red Hat Enterprise Linux
Google Container-Optimized OS
Amazon Linux 2
Ubuntu Linux
SUSE Linux
Oracle Linux
SUSE openSUSE
RESF Rocky Linux
Microsoft Azure Linux
Golang Go
Red Hat OpenShift

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uncaught exception
CWE: CWE-248
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 315061
Nessus Name: SUSE SLED15 / SLES15 Security Update : go1.25 (SUSE-SU-2026:1862-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: net 1.25.10/1.26.3

Timelineinfo

04/07/2026 CVE reserved
05/07/2026 +30 days Advisory disclosed
05/07/2026 +0 days VulDB entry created
07/20/2026 +74 days VulDB entry last update

Sourcesinfo

Advisory: go.dev
Status: Confirmed

CVE: CVE-2026-39836 (🔒)
GCVE (CVE): GCVE-0-2026-39836
GCVE (VulDB): GCVE-100-361955
EUVD: 🔒
CERT Bund: WID-SEC-2026-1437 - Golang Go: Mehrere Schwachstellen

Entryinfo

Created: 05/07/2026 22:35
Updated: 07/20/2026 14:06
Changes: 05/07/2026 22:35 (53), 05/08/2026 02:32 (1), 05/09/2026 01:00 (7), 05/16/2026 19:57 (2), 06/19/2026 18:24 (1), 07/20/2026 14:06 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.