// For flags

CVE-2021-27918

golang: encoding/xml: infinite loop when using xml.NewTokenDecoder with a custom TokenReader

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

encoding/xml in Go before 1.15.9 and 1.16.x before 1.16.1 has an infinite loop if a custom TokenReader (for xml.NewTokenDecoder) returns EOF in the middle of an element. This can occur in the Decode, DecodeElement, or Skip method.

encoding/xml en Go versiones anteriores a 1.15.9 y versiones 1.16.x anteriores a 1.16.1, presenta un bucle infinito si un TokenReader personalizado (para xml.NewTokenDecoder) devuelve EOF en medio de un elemento. Esto puede ocurrir en el método Decode, DecodeElement o Skip

An infinite loop vulnerability was found in golang. If an application defines a custom token parser initializing with `xml.NewTokenDecoder` it is possible for the parsing loop to never return. An attacker could potentially craft a malicious XML document which has an XML element with `EOF` within it, causing the parsing application to endlessly loop, resulting in a Denial of Service (DoS).

Red Hat OpenShift Serverless 1.16.0 release of the OpenShift Serverless Operator. This version of the OpenShift Serverless Operator is supported on Red Hat OpenShift Container Platform versions 4.6 and 4.7, and includes security and bug fixes and enhancements. For more information, see the documentation listed in the References section. Issues addressed include a memory exhaustion vulnerability.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-03-03 CVE Reserved
  • 2021-03-10 CVE Published
  • 2024-08-03 CVE Updated
  • 2025-04-03 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Golang
Search vendor "Golang"
 Go
Search vendor "Golang" for product "Go"
 < 1.15.9
Search vendor "Golang" for product "Go" and version " < 1.15.9"
-
Affected
Golang
Search vendor "Golang"
 Go
Search vendor "Golang" for product "Go"
 >= 1.16.0 < 1.16.1
Search vendor "Golang" for product "Go" and version " >= 1.16.0 < 1.16.1"
-
Affected