Medium
Security advisory
Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android are vulnerable to an IDN homograph attack when displaying messages containing URLs. This occurs because the application produces a clickable link even if (for example) Latin and Cyrillic characters exist in the same domain name, and the available font has an identical representation of characters from different alphabets.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2019-9970
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:28 UTC · Revision 1
Source evidence
Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android are vulnerable to an IDN homograph attack when displaying messages containing URLs. This occurs because the application produces a clickable link even if (for example) Latin and Cyrillic characters exist in the same domain name, and the available font has an identical representation of characters from different alphabets.
osv:CVE-2019-9970
Complete source record
{
"id": "2fe35d937e296eaceaa7923011dd5deaf013c774a82f2145105b192f40b325b3",
"url": "https://osv.dev/vulnerability/CVE-2019-9970",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2019-9970",
"summary": "Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android are vulnerable to an IDN homograph attack when displaying messages containing URLs. This occurs because the application produces a clickable link even if (for example) Latin and Cyrillic characters exist in the same domain name, and the available font has an identical representation of characters from different alphabets.",
"evidence": "osv:CVE-2019-9970",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2019-9970",
"aliases": [
"CVE-2019-9970"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/signalapp/signal-android",
"type": "GIT",
"events": [
{
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},
{
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}
],
"database_specific": {
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{
"cpe": "cpe:2.3:a:signal:private_messenger:*:*:*:*:*:android:*:*",
"range": [
{
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},
{
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"source": "CPE_RANGE"
}
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],
"modified": "2026-10-24T10:30:53.705174654Z",
"provider": "osv",
"references": [
"https://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txt"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2019-9970",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 437980,
"published_at": "2019-03-24T02:29:00.67+00:00"
}