CVE-2018-18928

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

9.8 CriticalFix available

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

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.90%Up 2.1 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

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

Record: CVE-2018-18928
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-190
Updated: 2026-11-02

CVE List No score

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

Record: CVE-2018-18928
Updated: 2026-11-02

EUVDEUVD-2018-10634 No score

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

Record: EUVD-2018-10634
Updated: 2026-11-02

GitHub AdvisoriesGHSA-m2ch-6888-5mgr 9.8

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

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

Record: GHSA-m2ch-6888-5mgr
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-190
Updated: 2026-11-02

OSV 9.8

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

Record: CVE-2018-18928
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2018-18928 9.8

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

Record: DEBIAN-CVE-2018-18928
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVMGASA-2019-0353 No score

Updated icu packages fix security vulnerability

The updated packages fix a security vulnerability:

International Components for Unicode (ICU) for C/C++ 63.1 has an integer overflow in number::impl::DecimalQuantity::toScientificString() in i18n/number_decimalquantity.cpp. (CVE-2018-18928)

Record: MGASA-2019-0353
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`icu` Debian:12	before 63.1-3	63.1-3
`icu` Debian:13	before 63.1-3	63.1-3
`icu` Debian:14	before 63.1-3	63.1-3
`icu` Mageia:7	before 63.1-1.1.mga7	63.1-1.1.mga7

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-18928 is a critical vulnerability (CVSS 9.8) in Icu-project International Components For Unicode, published November 4, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.90%, the 87th percentile. Fixed in icu 63.1-3.

References

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