What is CVE-2018-18928?

CVE-2018-18928 is a critical-severity vulnerability in Icu-Project International Components For Unicode, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2018-11-04.

How severe is CVE-2018-18928?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Integer overflow in Icu-Project International Components For Unicode

CVE-2018-18928

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

Vulnerability class: Integer Overflow

Published 2018-11-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

Icu-Project International Components For Unicode — versions 63.1

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

github.com/unicode-org/icu/commit/53d8c8f3d181d87a6aa925b449b51c4a2c922a51 (Patch, Vendor Advisory)
unicode-org.atlassian.net/browse/ICU-20246 (Vendor Advisory)
bugs.chromium.org/p/chromium/issues/detail (Third Party Advisory)

Frequently asked questions

What is CVE-2018-18928?: CVE-2018-18928 is a critical-severity vulnerability in Icu-Project International Components For Unicode, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2018-11-04.
How severe is CVE-2018-18928?: Critical severity. CVSS v3 base score is 9.8 out of 10.