What’s Vulnerable › Vulnerabilities

CVE-2026-56852: Infinite loop on invalid input in golang.org/x/text

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-21 · updated 2026-10-24
• Weakness: CWE-835

Description

A norm.Iter can enter an infinite loop when handling input containing invalid UTF-8 bytes.

Affected products

• Golang.Org/X/Text: before 0.39.0 — fixed in 0.39.0
• golang.org/x/text/unicode/norm: before 0.39.0 — fixed in 0.39.0

How to fix

Upgrade to a fixed version: Golang.Org/X/Text 0.39.0; golang.org/x/text/unicode/norm 0.39.0. Check the vendor advisory for mitigations.

References

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

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