HighFix available
icu — security advisory
An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.
- Products
- icu
- Affected versions
- Not specified
- Fixed versions
- 63.2-3
- CVEs
- CVE-2020-10531
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:24 UTC · Revision 1
Source evidence
An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.
osv:DEBIAN-CVE-2020-10531
icu
Fixed versions: 63.2-3
icu
Fixed versions: 63.2-3
icu
Fixed versions: 63.2-3
Complete source record
{
"id": "298a4a4f5510032f43214a08835d31dc6c42684b2feda35033897b5fa523b316",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-10531",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2020-10531",
"summary": "An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.",
"evidence": "osv:DEBIAN-CVE-2020-10531",
"products": [
{
"name": {
"value": "icu",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "63.2-3",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "icu",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "63.2-3",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "icu",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "63.2-3",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2020-10531",
"aliases": [
"DEBIAN-CVE-2020-10531"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "63.2-3"
}
]
}
],
"package": {
"name": "icu",
"purl": "pkg:deb/debian/icu?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-10531.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
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{
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}
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],
"package": {
"name": "icu",
"purl": "pkg:deb/debian/icu?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-10531.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "63.2-3"
}
]
}
],
"package": {
"name": "icu",
"purl": "pkg:deb/debian/icu?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-10531.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T12:00:04.471913384Z",
"provider": "osv",
"upstream": [
"CVE-2020-10531"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2020-10531"
]
},
"related_cves": [
{
"value": "CVE-2020-10531",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450965,
"published_at": "2020-03-12T19:15:13.227+00:00"
}