libdigidocpp — security advisory

{
  "id": "6dc2911cb348bce4cebf14bd76e1ddf54c7e00774cc8beec21e80bed2d909636",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-103902",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-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:UBUNTU-CVE-2026-103902",
    "products": [
      {
        "name": {
          "value": "libdigidocpp",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0.3.0-0ubuntu9",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.3.0-0ubuntu10",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.3.0-0ubuntu11",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-103902",
      "aliases": [
        "UBUNTU-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"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libdigidocpp",
            "purl": "pkg:deb/ubuntu/libdigidocpp?arch=source&distro=xenial",
            "ecosystem": "Ubuntu:16.04:LTS"
          },
          "versions": [
            "0.3.0-0ubuntu9",
            "0.3.0-0ubuntu10",
            "0.3.0-0ubuntu11"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103902.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "libdigidocpp-common",
                "binary_version": "0.3.0-0ubuntu11"
              },
              {
                "binary_name": "libdigidocpp0",
                "binary_version": "0.3.0-0ubuntu11"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:57:58.452270703Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-103902"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-103902",
        "https://www.cve.org/CVERecord?id=CVE-2026-103902",
        "https://github.com/open-eid/libdigidocpp/pull/735",
        "https://www.id.ee/en/article/id-tarkvara-uus-versioon-267-on-avalikustatud/"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-103902",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 357802,
  "published_at": "2026-10-12T11:17:00+00:00"
}