CVE-2026-42507
Arbitrary inputs are included in errors without any escaping in net/textproto
Description
When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged.
INFO
Published Date :
June 2, 2026, 11:16 p.m.
Last Modified :
June 4, 2026, 4:15 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Validate all inputs carefully.
- Escape user-supplied data in error messages.
- Avoid logging sensitive user inputs.
Public PoC/Exploit Available at Github
CVE-2026-42507 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-2026-42507.
| URL | Resource |
|---|---|
| https://go.dev/cl/777060 | |
| https://go.dev/issue/79346 | |
| https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw | |
| https://pkg.go.dev/vuln/GO-2026-5039 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42507 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-2026-42507
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
Dockerfile
Caddy Proxy Manager - Lightweight web UI for managing Caddy reverse proxy
Dockerfile Makefile Go HTML CSS JavaScript
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42507 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42507 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.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 03, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N -
New CVE Received by [email protected]
Jun. 02, 2026
Action Type Old Value New Value Added Description When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged. Added Reference https://go.dev/cl/777060 Added Reference https://go.dev/issue/79346 Added Reference https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw Added Reference https://pkg.go.dev/vuln/GO-2026-5039