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    4 vulnerabilities by cole

    CVE-2026-55558 (GCVE-0-2026-55558)

    Vulnerability from nvd – Published: 2026-08-20 14:29 – Updated: 2026-08-20 20:00
    VLAI
    Title
    aiosmtplib: STARTTLS response injection
    Summary
    aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.start_tls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol._buffer. An active network attacker can place attacker-chosen SMTP response lines after the plaintext 220 response in the same network segment. The method then calls loop.start_tls; those bytes survive the transport upgrade and are parsed as the first response from inside the TLS session, desynchronizing subsequent SMTP command and response pairs. Connections using start_tls=True or opportunistic STARTTLS are affected, while connections using use_tls=True are not. This issue is fixed in version 5.1.2.
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-20 20:00 UTC
    CWE
    • CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
    Impacted products
    Vendor Product Version
    cole aiosmtplib Affected: < 5.1.2
    Create a notification for this product.
    Show details on NVD website

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    CVE-2026-53533 (GCVE-0-2026-53533)

    Vulnerability from nvd – Published: 2026-08-18 17:54 – Updated: 2026-08-19 18:21
    VLAI
    Title
    aiosmtplib: SMTP command injection via CR/LF in sender/recipient address
    Summary
    aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.1, SMTP.mail(), SMTP.rcpt(), SMTP.vrfy(), and SMTP.expn() send caller-supplied addresses without rejecting embedded CR or LF bytes. Data after the line break is framed as additional standalone SMTP command lines, allowing an attacker who influences an envelope sender or recipient to inject commands such as MAIL FROM, RCPT TO, RSET, DATA, or AUTH. SMTP.sendmail() and SMTP.send() without a Message object pass addresses through the affected methods, while SMTP.send_message() is not affected. Successful injection can desynchronize the command-response pipeline, hang the SMTP instance, or send an arbitrary message without requiring attacker control of the SMTP server. This issue is fixed in version 5.1.1.
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-19 18:04 UTC
    CWE
    • CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
    • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
    Impacted products
    Vendor Product Version
    cole aiosmtplib Affected: < 5.1.1
    Create a notification for this product.
    Show details on NVD website

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    CVE-2026-55558 (GCVE-0-2026-55558)

    Vulnerability from cvelistv5 – Published: 2026-08-20 14:29 – Updated: 2026-08-20 20:00
    VLAI
    Title
    aiosmtplib: STARTTLS response injection
    Summary
    aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.2, SMTPProtocol.start_tls in src/aiosmtplib/protocol.py consumes the server's 220 response and starts the TLS handshake without clearing SMTPProtocol._buffer. An active network attacker can place attacker-chosen SMTP response lines after the plaintext 220 response in the same network segment. The method then calls loop.start_tls; those bytes survive the transport upgrade and are parsed as the first response from inside the TLS session, desynchronizing subsequent SMTP command and response pairs. Connections using start_tls=True or opportunistic STARTTLS are affected, while connections using use_tls=True are not. This issue is fixed in version 5.1.2.
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-20 20:00 UTC
    CWE
    • CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
    Impacted products
    Vendor Product Version
    cole aiosmtplib Affected: < 5.1.2
    Create a notification for this product.
    Show details on NVD website

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    CVE-2026-53533 (GCVE-0-2026-53533)

    Vulnerability from cvelistv5 – Published: 2026-08-18 17:54 – Updated: 2026-08-19 18:21
    VLAI
    Title
    aiosmtplib: SMTP command injection via CR/LF in sender/recipient address
    Summary
    aiosmtplib is an asynchronous SMTP client for use with asyncio. Prior to 5.1.1, SMTP.mail(), SMTP.rcpt(), SMTP.vrfy(), and SMTP.expn() send caller-supplied addresses without rejecting embedded CR or LF bytes. Data after the line break is framed as additional standalone SMTP command lines, allowing an attacker who influences an envelope sender or recipient to inject commands such as MAIL FROM, RCPT TO, RSET, DATA, or AUTH. SMTP.sendmail() and SMTP.send() without a Message object pass addresses through the affected methods, while SMTP.send_message() is not affected. Successful injection can desynchronize the command-response pipeline, hang the SMTP instance, or send an arbitrary message without requiring attacker control of the SMTP server. This issue is fixed in version 5.1.1.
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-19 18:04 UTC
    CWE
    • CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
    • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
    Impacted products
    Vendor Product Version
    cole aiosmtplib Affected: < 5.1.1
    Create a notification for this product.
    Show details on NVD website

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              "tags": [
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              ],
              "url": "https://github.com/cole/aiosmtplib/security/advisories/GHSA-v3q9-hj7j-63hq"
            },
            {
              "name": "https://github.com/cole/aiosmtplib/commit/8eaf6efc9a8f59e2e09d3ef11246a058c46bd3ba",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/cole/aiosmtplib/commit/8eaf6efc9a8f59e2e09d3ef11246a058c46bd3ba"
            },
            {
              "name": "https://github.com/cole/aiosmtplib/releases/tag/v5.1.1",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/cole/aiosmtplib/releases/tag/v5.1.1"
            }
          ],
          "source": {
            "advisory": "GHSA-v3q9-hj7j-63hq",
            "discovery": "UNKNOWN"
          },
          "title": "aiosmtplib: SMTP command injection via CR/LF in sender/recipient address"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-53533",
        "datePublished": "2026-08-18T17:54:23.124Z",
        "dateReserved": "2026-06-09T17:30:33.457Z",
        "dateUpdated": "2026-08-19T18:21:20.334Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }