---
id: CVE-2018-18928
title: >-
  International Components for Unicode (ICU) for C/C++ 63.1 has an integer
  overflow in number::impl::DecimalQuantity::toScientificString() in
  i18n/number_decimalquantity.cpp.
summary: >-
  International Components for Unicode (ICU) for C/C++ 63.1 has an integer
  overflow in number::impl::DecimalQuantity::toScientificString() in
  i18n/number_decimalquantity.cpp.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: icu-project
product: international_components_for_unicode
affected:
  - international_components_for_unicode = 63.1
published: '2018-11-04'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T07:16:43.217'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2018-18928'
references:
  - url: 'https://bugs.chromium.org/p/chromium/issues/detail?id=900059'
    label: cve@mitre.org
  - url: >-
      https://github.com/unicode-org/icu/commit/53d8c8f3d181d87a6aa925b449b51c4a2c922a51
    label: cve@mitre.org
  - url: 'https://unicode-org.atlassian.net/browse/ICU-20246'
    label: cve@mitre.org
  - url: 'https://bugs.chromium.org/p/chromium/issues/detail?id=900059'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/unicode-org/icu/commit/53d8c8f3d181d87a6aa925b449b51c4a2c922a51
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://unicode-org.atlassian.net/browse/ICU-20246'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-18928.json
  - url: 'https://access.redhat.com/security/cve/CVE-2018-18928'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1646702'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2018-18928'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2018-18928'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.02841
epssPercentile: 0.86326
ingestedAt: '2026-10-14T07:21:04.803Z'
---

## Overview

International Components for Unicode (ICU) for C/C++ 63.1 has an integer overflow in number::impl::DecimalQuantity::toScientificString() in i18n/number_decimalquantity.cpp.

## Affected

- `international_components_for_unicode = 63.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Low · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-18928.json)