High
Security advisory
Improper verification of cryptographic signature vulnerability in DigiDoc libdigidocpp, DigiDoc DigiDoc4, DigiDoc DigiDoc Android, and DigiDoc DigiDoc iOS. The vulnerability allows an attacker to create forged digital signatures that are displayed a valid by affected DigiDoc software.This issue affects libdigidocpp: from 4.0.0 before 4.5.0; DigiDoc4: from 4.6.0 before 4.11.0; DigiDoc Android: from 2.7.0 before 3.1.0; DigiDoc iOS: from 2.7.0 before 3.1.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-103902
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:00 UTC · Revision 1
Source evidence
Improper verification of cryptographic signature vulnerability in DigiDoc libdigidocpp, DigiDoc DigiDoc4, DigiDoc DigiDoc Android, and DigiDoc DigiDoc iOS. The vulnerability allows an attacker to create forged digital signatures that are displayed a valid by affected DigiDoc software.This issue affects libdigidocpp: from 4.0.0 before 4.5.0; DigiDoc4: from 4.6.0 before 4.11.0; DigiDoc Android: from 2.7.0 before 3.1.0; DigiDoc iOS: from 2.7.0 before 3.1.0.
osv:CVE-2026-103902
Complete source record
{
"id": "8887ff9c3ee9be06d5c190809bf9553a34845f0730c5925136603f856cb74249",
"url": "https://osv.dev/vulnerability/CVE-2026-103902",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2026-103902",
"summary": "Improper verification of cryptographic signature vulnerability in DigiDoc libdigidocpp, DigiDoc DigiDoc4, DigiDoc DigiDoc Android, and DigiDoc DigiDoc iOS. The vulnerability allows an attacker to create forged digital signatures that are displayed a valid by affected DigiDoc software.This issue affects libdigidocpp: from 4.0.0 before 4.5.0; DigiDoc4: from 4.6.0 before 4.11.0; DigiDoc Android: from 2.7.0 before 3.1.0; DigiDoc iOS: from 2.7.0 before 3.1.0.",
"evidence": "osv:CVE-2026-103902",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-103902",
"aliases": [
"CVE-2026-103902"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/open-eid/libdigidocpp",
"type": "GIT",
"events": [
{
"introduced": "72437deddd45d38e6a39d05f849430239595e9a1"
},
{
"fixed": "bc64a76d46a524f92299ee5c57f6a91fc3e58ccb"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "4.0.0"
},
{
"fixed": "4.5.0"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
"v4.4.0",
"v4.3.0",
"v4.2.0",
"v4.1.0",
"v4.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103902.json",
"vanir_signatures": [
{
"id": "CVE-2026-103902-33d5e796",
"digest": {
"threshold": 0.9,
"line_hashes": [
"312959972205632028230483251303063886147",
"93805658002638060122815703348188177908",
"69711266402591952504601960314919680947",
"70203620280218842368363274354291409124",
"4346753961849132922032821287453467603",
"177393883540411790573836519743645285933",
"338050174802615739915324879924577419432",
"108714037145691125561223776889784802819",
"21456362281263831829929420295654825463",
"327177442071404807151148206536985049751",
"241814844225100063444014749951036016584",
"274494766644415093696794491258817481568",
"142941975100481207219440167830830426235",
"107435632318039425845512893560780991869",
"147134573737290235284577579038261809708",
"258224101250907685813062929263046199077",
"127743667511833848645032761997051325348",
"59458320989002813863950933328606584163",
"86418597087599216150355888942961107275",
"35933469300476709780747217461590852428"
]
},
"source": "https://github.com/open-eid/libdigidocpp/commit/bc64a76d46a524f92299ee5c57f6a91fc3e58ccb",
"target": {
"file": "src/digidoc-tool.cpp"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2026-103902-9645cccc",
"digest": {
"length": 2687,
"function_hash": "128878079623559237151710275958740382787"
},
"source": "https://github.com/open-eid/libdigidocpp/commit/bc64a76d46a524f92299ee5c57f6a91fc3e58ccb",
"target": {
"file": "src/digidoc-tool.cpp",
"function": "ToolConfig::ToolConfig"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2026-103902-b9f76181",
"digest": {
"length": 4987,
"function_hash": "305238429481044676657540943748768376924"
},
"source": "https://github.com/open-eid/libdigidocpp/commit/bc64a76d46a524f92299ee5c57f6a91fc3e58ccb",
"target": {
"file": "src/digidoc-tool.cpp",
"function": "printUsage"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-24T07:22:37Z"
}
}
],
"modified": "2026-10-24T07:22:37.242431608Z",
"provider": "osv",
"references": [
"https://www.id.ee/en/article/id-tarkvara-uus-versioon-267-on-avalikustatud/",
"https://github.com/open-eid/libdigidocpp/pull/735"
],
"provider_metadata": {
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "4.6.0"
},
{
"fixed": "4.11.0"
},
{
"introduced": "2.7.0"
},
{
"fixed": "3.1.0"
},
{
"introduced": "2.7.0"
},
{
"fixed": "3.1.0"
}
],
"source": "DESCRIPTION"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2026-103902",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 428755,
"published_at": "2026-10-12T11:17:08.617+00:00"
}