CVE-2026-39819
Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go
Description
The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink.
INFO
Published Date :
May 7, 2026, 8:16 p.m.
Last Modified :
May 13, 2026, 3:05 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Restrict write permissions in the temporary directory.
- Ensure the application does not use predictable filenames.
Public PoC/Exploit Available at Github
CVE-2026-39819 has a 1 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-2026-39819.
| URL | Resource |
|---|---|
| https://go.dev/cl/763882 | Patch |
| https://go.dev/issue/78584 | Issue Tracking |
| https://groups.google.com/g/golang-announce/c/qcCIEXso47M | Issue Tracking Mailing List |
| https://pkg.go.dev/vuln/GO-2026-4978 | 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-2026-39819 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-2026-39819
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).
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-39819 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-39819 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:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N Added CWE CWE-59 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/763882 Types: Patch Added Reference Type Go Project: https://go.dev/issue/78584 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-2026-4978 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:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N -
New CVE Received by [email protected]
May. 07, 2026
Action Type Old Value New Value Added Description The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink. Added Reference https://go.dev/cl/763882 Added Reference https://go.dev/issue/78584 Added Reference https://groups.google.com/g/golang-announce/c/qcCIEXso47M Added Reference https://pkg.go.dev/vuln/GO-2026-4978