What’s Vulnerable › Vulnerabilities

CVE-2021-27918

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-11 · updated 2026-06-17
• Weakness: CWE-835

Description

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.

Affected products

• Go: before 1.15.9; from 1.16.0 before 1.16.1 — fixed in 1.15.9, 1.16.1

How to fix

Upgrade to a fixed version: Go 1.15.9, 1.16.1. Check the vendor advisory for mitigations.

References

• https://groups.google.com/g/golang-announce/c/MfiLYjG-RAw
• https://security.gentoo.org/glsa/202208-02
• https://groups.google.com/g/golang-announce/c/MfiLYjG-RAw
• https://security.gentoo.org/glsa/202208-02

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