CVE-2018-18928 — International Components for Unicode (ICU) for C/C++ 63

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

01What is this 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.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-11-04T20:29:00.247
• Last modified: 2026-10-14T07:16:43.217

09References

• bugs.chromium.org — https://bugs.chromium.org/p/chromium/issues/detail?id=900059
• github.com — https://github.com/unicode-org/icu/commit/53d8c8f3d181d87a6aa925b449b51c4a2c922a…
• unicode-org.atlassian.net — https://unicode-org.atlassian.net/browse/ICU-20246
• bugs.chromium.org — https://bugs.chromium.org/p/chromium/issues/detail?id=900059
• github.com — https://github.com/unicode-org/icu/commit/53d8c8f3d181d87a6aa925b449b51c4a2c922a…
• unicode-org.atlassian.net — https://unicode-org.atlassian.net/browse/ICU-20246
• cert-portal.siemens.com — https://cert-portal.siemens.com/productcert/html/ssa-398330.html