aiosmtplib — security advisory

{
  "id": "7108309c646822bd2590db33ea3ab9c44609d87b5c724648dffd93d005833e9b",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-90467",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-90467",
    "summary": "aiosmtplib before 5.1.3 fails to properly validate email addresses supplied by callers, allowing attackers to inject ESMTP parameters into MAIL FROM and RCPT TO command lines. Attackers can craft malicious addresses containing spaces and angle brackets to append parameters like AUTH, NOTIFY, or ORCPT to envelope commands, forging authenticated identities or forcing delivery notifications to third parties.",
    "evidence": "osv:UBUNTU-CVE-2026-90467",
    "products": [
      {
        "name": {
          "value": "aiosmtplib",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.1.4-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.1.4-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.1.6-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "aiosmtplib",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "5.1.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "5.1.0-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "5.1.2-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "aiosmtplib",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.0.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "4.0.2-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "5.0.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "5.1.0-1",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-90467",
      "aliases": [
        "UBUNTU-CVE-2026-90467"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"
        },
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "aiosmtplib",
            "purl": "pkg:deb/ubuntu/aiosmtplib?arch=source&distro=jammy",
            "ecosystem": "Ubuntu:22.04:LTS"
          },
          "versions": [
            "1.1.4-1",
            "1.1.4-2",
            "1.1.6-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90467.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-aiosmtplib",
                "binary_version": "1.1.6-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "aiosmtplib",
            "purl": "pkg:deb/ubuntu/aiosmtplib?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "5.1.0-1",
            "5.1.0-3",
            "5.1.2-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90467.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-aiosmtplib",
                "binary_version": "5.1.2-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "aiosmtplib",
            "purl": "pkg:deb/ubuntu/aiosmtplib?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "4.0.0-1",
            "4.0.2-1",
            "5.0.0-1",
            "5.1.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-90467.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "python3-aiosmtplib",
                "binary_version": "5.1.0-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T13:01:16.581544840Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-90467"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-90467",
        "https://www.cve.org/CVERecord?id=CVE-2026-90467",
        "https://github.com/cole/aiosmtplib",
        "https://github.com/cole/aiosmtplib/blob/v5.1.2/src/aiosmtplib/email.py",
        "https://github.com/cole/aiosmtplib/commit/2e1b210714974ccc9efd0d09a8f846cb9aeaaec2",
        "https://github.com/cole/aiosmtplib/releases/tag/v5.1.3",
        "https://www.vulncheck.com/advisories/aiosmtplib-before-5.1.3-esmtp-parameter-injection-via-unvalidated-addresses"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-90467",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/1/score"
  },
  "source_id": "core-osv",
  "document_id": 361463,
  "published_at": "2026-09-12T02:16:00+00:00"
}