What is CVE-2026-56852?

CVE-2026-56852 is a high-severity vulnerability in Golang.org/x/text Golang.org/x/text/unicode/norm, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-07-21.

How severe is CVE-2026-56852?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2026-56852 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Golang.org/x/text Golang.org/x/text/unicode/norm

CVE-2026-56852

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

EPSS: 0.005 (39.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Golang.org/x/text Golang.org/x/text/unicode/norm — versions 0

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

Public proof-of-concept exploits

katekeiroz-dev/golang-x-text

References

Frequently asked questions

What is CVE-2026-56852?: CVE-2026-56852 is a high-severity vulnerability in Golang.org/x/text Golang.org/x/text/unicode/norm, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-07-21.
How severe is CVE-2026-56852?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2026-56852 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.