What is CVE-2026-56851?

CVE-2026-56851 is a high-severity vulnerability in Golang.org/x/text Golang.org/x/text/secure/precis, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-10-07.

How severe is CVE-2026-56851?

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

Buffer overflow in Golang.org/x/text Golang.org/x/text/secure/precis

CVE-2026-56851

The Nickname profile can panic with an out-of-bounds slice error when transforming crafted input into a short destination buffer.

Vulnerability class: Buffer Overflow

Published 2026-10-07 · last modified 2026-10-08.

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.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Golang.org/x/text Golang.org/x/text/secure/precis

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

Frequently asked questions

What is CVE-2026-56851?: CVE-2026-56851 is a high-severity vulnerability in Golang.org/x/text Golang.org/x/text/secure/precis, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-10-07.
How severe is CVE-2026-56851?: High severity. CVSS v3 base score is 7.5 out of 10.