CVE-2026-39836
Panic in Dial and LookupPort when handling NUL byte on Windows in net
Description
The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).
INFO
Published Date :
May 7, 2026, 8:16 p.m.
Last Modified :
May 13, 2026, 3:11 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update the component to the latest version.
- Avoid using NUL characters in input.
- Review input validation logic.
Public PoC/Exploit Available at Github
CVE-2026-39836 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-39836.
| URL | Resource |
|---|---|
| https://go.dev/cl/775320 | Patch |
| https://go.dev/issue/79006 | Issue Tracking |
| https://groups.google.com/g/golang-announce/c/qcCIEXso47M | Issue Tracking Mailing List |
| https://pkg.go.dev/vuln/GO-2026-4971 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-39836 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-39836
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
HCL Shell
This project provides a simple example of Spring Boot CRUD application with Postgres DB, docker-compose and LGTM Observability support
docker docker-compose grafana jdbc lgtm-stack makefile postgres spring-boot
Makefile Shell Dockerfile Java
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-39836 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-39836 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-476 Added CPE Configuration OR *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions up to (excluding) 1.25.10 *cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* versions from (including) 1.26.0 up to (excluding) 1.26.3 Added Reference Type Go Project: https://go.dev/cl/775320 Types: Patch Added Reference Type Go Project: https://go.dev/issue/79006 Types: Issue Tracking Added Reference Type Go Project: https://groups.google.com/g/golang-announce/c/qcCIEXso47M Types: Issue Tracking, Mailing List Added Reference Type Go Project: https://pkg.go.dev/vuln/GO-2026-4971 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by [email protected]
May. 07, 2026
Action Type Old Value New Value Added Description The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0). Added Reference https://go.dev/cl/775320 Added Reference https://go.dev/issue/79006 Added Reference https://groups.google.com/g/golang-announce/c/qcCIEXso47M Added Reference https://pkg.go.dev/vuln/GO-2026-4971