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GHSA-5p4h-3377-7w67 CVE-2018-17075 GO-2021-0078

golang.org/x/net/html NULL Pointer Dereference vulnerability

High Go
Severity
7.5 / 10
High · CVSS 3.1
Exploit chance (EPSS)
2.77%
Chance of exploitation in the next 30 days. Higher than 86.35% of scored vulnerabilities.
Known exploited
No
Not in CISA's catalog
Weakness
CWE-476 NULL Pointer Dereference
Fix
0.0.0-20180816102801-aaf60122140d
Upgrade golang.org/x/net to this version or later

Description

The html package (aka x/net/html) before 2018-07-13 in Go mishandles "in frameset" insertion mode, leading to a "panic: runtime error" for html.Parse of <template><object>, <template><applet>, or <template><marquee>. This is related to HTMLTreeBuilder.cpp in WebKit.

Affected versions

Go

PackageVulnerableFixed in
golang.org/x/net
< 0.0.0-20180816102801-aaf60122140d
0.0.0-20180816102801-aaf60122140d

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.

golang.org/x/net Go → 0.0.0-20180816102801-aaf60122140d

go
go get golang.org/x/net@v0.0.0-20180816102801-aaf60122140d && go mod tidy

Severity breakdown

CVSS 3.1 7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Weakness

CWE-476: NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

How to prevent it
  • Implementation: For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
  • Requirements: Select a programming language that is not susceptible to these issues.
  • Implementation: Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
  • Architecture and Design: Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.
  • Implementation: Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.

References

Advisories

Packages

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 golang.org/x/net
GHSA-qppj-fm5r-hxr3
HTTP/2 Stream Cancellation Attack
Medium Known exploited Also affects golang.org/x/net
GO-2026-6866
Check all ancestor namespace transitions when rendering raw text in html in golang.org/x/net
Not rated yet Also affects golang.org/x/net
GO-2026-6860
Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net
Not rated yet Also affects golang.org/x/net
GO-2026-6617
HTTP/2 server crash due to HPACK encoder race in net/http
High Also affects golang.org/x/net
GO-2026-6612
Double flow control refund on HTTP/2 server streams in net/http
Critical Also affects golang.org/x/net
GO-2026-6611
Excessive CPU consumption from repeated initial window changes in net/http
High Also affects golang.org/x/net
GO-2026-6610
HTTP/2 transport accepts malformed framing-related headers in net/http
High Also affects golang.org/x/net

Credits: Kunpei Sakai

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