GO-2026-5970: golang.org/x/text (CVE-2026-56852)

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

CVSS 7.5 HighEPSS 0.0047 · 41st percentile

Published by OSV at 14 Jul 2026, 17:29 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
golang.org/x/text	Go	<0.39.0	0.39.0

Identifiers

GO-2026-5970 · CVE-2026-56852

Weakness (CWE)

CWE-835

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

golang.org/x/text versions before 0.39.0 are affected. A norm.Iter can enter an infinite loop when it processes input containing invalid UTF-8 bytes. The source does not describe what kind of access an attacker would need. Upgrade to golang.org/x/text version 0.39.0 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	ADP (CISA-ADP)

CISA KEV Not listed.
EPSS 0.0047, the 41st percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:13 UTC First seen by agentprime
31 Oct 2026, 14:13 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.