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GO-2021-0226 BIT-golang-2020-24553 CVE-2020-24553

Cross-site scripting in net/http/cgi and net/http/fcgi

Not rated yet Go
Severity
Not rated yet
No source has published a CVSS score yet
Exploit chance (EPSS)
3.65%
Chance of exploitation in the next 30 days. Higher than 89.59% of scored vulnerabilities.
Known exploited
No
Not in CISA's catalog
Weakness
—
Not classified
Fix
1.15.1
Upgrade stdlib to this version or later

Description

When a Handler does not explicitly set the Content-Type header, the the package would default to “text/html”, which could cause a Cross-Site Scripting vulnerability if an attacker can control any part of the contents of a response.

The Content-Type header is now set based on the contents of the first Write using http.DetectContentType, which is consistent with the behavior of the net/http package.

Although this protects some applications that validate the contents of uploaded files, not setting the Content-Type header explicitly on any attacker-controlled file is unsafe and should be avoided.

Affected versions

Go

PackageVulnerableFixed in
stdlib
< 1.14.8
>= 1.15.0-0, < 1.15.1
1.14.8
1.15.1

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

stdlib Go → 1.15.1

go
go get stdlib@v1.15.1 && go mod tidy

References

Fixes and patches

Issue reports

Other links

Timeline

  1. Published
  2. Last updated by the source
  3. Latest EPSS score
AdvisorySeverityWhy it's related
GHSA-4374-p667-p6c8
HTTP/2 rapid reset can cause excessive work in net/http
High Known exploited Also affects stdlib
CVE-2020-0601
Certificate validation bypass on Windows in crypto/x509
High Known exploited Also affects stdlib
RUSTSEC-2026-0382
Distrust compromised intermediate certificates in crypto/x509
Medium Also affects stdlib
GO-2026-6613
HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http
High Also affects stdlib
GO-2026-6609
Lack of limit on size of parsed Range headers in net/http
High Also affects stdlib
GO-2026-6608
Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart
High Also affects stdlib
GO-2026-6607
Reject malformed ECH outer extension references in crypto/tls
High Also affects stdlib
GO-2026-6604
Root.Mkdir(All) can follow junctions out of the root on Windows in os
Critical Also affects stdlib

Credits: RedTeam Pentesting GmbH

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