Infinite loop on invalid input in golang.org/x/text (CVE-2026-56852) | HOL Guard CVE

High · CVSS 7.5CVE-2026-56852

Infinite loop on invalid input in golang.org/x/text

Answer in brief

CVE-2026-56852 records a High severity (CVSS 7.5) vulnerability in Infinite loop on invalid input in golang.org/x/text. The current sources do not mark it as known exploited. The current feed maps golang.org/x/text/golang.org/x/text/unicode/norm (generic), golang.org/x/text (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 21, 2026Updated Sep 23, 2026Source checked Sep 25, 2026First seen by HOL Aug 10, 2026Material review Sep 23, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps golang.org/x/text/golang.org/x/text/unicode/norm (generic), golang.org/x/text (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
golang.org/x/text/golang.org/x/text/unicode/normgeneric	>=0 <0.39.0	0.39.0
golang.org/x/textgo	>=0 <0.39.0	0.39.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for golang.org/x/text/golang.org/x/text/unicode/norm, golang.org/x/text.
Review the reported fix. Update golang.org/x/text/golang.org/x/text/unicode/norm to 0.39.0; golang.org/x/text to 0.39.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source description

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

Quoted source text, attributed separately from HOL analysis.