Infinite Loop Vulnerability in Go Language's norm.Iter Handling Invalid UTF-8 Input
CVE-2026-56852

7.5HIGH

Key Information:

Vendor

Golang.org/x/text

Status
Golang.org/x/text/unicode/norm
Vendor
CVE Published:
21 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-56852?

A vulnerability exists in the Go language's norm.Iter component where it fails to properly handle input containing invalid UTF-8 byte sequences. This oversight allows an attacker to exploit the input handling mechanism, potentially causing the system to enter an infinite loop. Such behavior can lead to service disruption, as the application may become unresponsive while processing malformed input. It is crucial for users of the Go language to ensure their implementations are updated to mitigate this risk.

Affected Version(s)

golang.org/x/text/unicode/norm 0 < 0.39.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

golang-x-text
Created by katekeiroz-dev

References

https://go.dev/issue/80142
https://go.dev/cl/794100
https://pkg.go.dev/vuln/GO-2026-5970

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.