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CVE-2026-56852VulnerabilityPublished Updated

golang.org/x/text · Infinite Loop on Invalid Input

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-56852· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade to 0.39.0 soon.

Data as of 31 Oct 2026, 08:37 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 41% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.39.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 21 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade golang.org/x/text/unicode/norm to 0.39.0.

Affected software

ProductAffectedFixed in
golang.org/x/textgolang.org/x/text/unicode/normAffected
  • <0.39.0
Fixed in
  • 0.39.0
Gogolang.org/x/text/unicode/normpkg:golang/golang.org/x/text/unicode/normOther threatsAffected
  • <0.39.0
Fixed in
  • 0.39.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

An infinite loop vulnerability exists in golang.org/x/text when processing invalid input, potentially causing the affected software to become unresponsive. This issue affects versions 3.0 and 4.0 of the product. No CVSS score or detailed impact information is provided, and there is no indication of active exploitation or available patches.

References

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