There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a
    use-after-free in the mail editing code, and to write memory contents beyond the intended buffer into the
    delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery,
    which can crash the delivery process and may allow execution of arbitrary code in the context of that
    process. Disable the Sieve editheader extension. Update to non-vulnerable version. No publicly available
    exploits are known. (CVE-2026-42007)

  - An attacker that can send mail to a user can craft a message whose headers contain a very large number of
    email addresses or MIME parameters, which causes excessive memory usage when the message is later parsed.
    The message is still delivered, but reading it over IMAP can exhaust the memory limit of the process and
    terminate it, causing denial of service for the affected user. Update to non-vulnerable version. No
    publicly available exploits are known. (CVE-2026-27852)

  - When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll()
    panic caused by file descriptor handling issues. If running in high-security mode (default for community
    releases), only the new submission connection gets terminated. If running in high-performance mode
    (default for Pro releases), all connections handled by the submission-login process will be terminated.
    The crashes can cause failure for user to send a message, or it can cause duplicate messages to be sent.
    If TLS is not used (in the backend server processing the submission), duplicate deliveries cannot happen,
    because the crash can only happen at AUTH stage. Limit the number of connections handled by single
    submission-login process. This has a performance impact though. Update to non-vulnerable version. No
    publicly available exploits are known. (CVE-2026-33263)

  - An attacker that can get Dovecot to relay a message, for example through Sieve redirect or submission
    relay, can use a crafted line ending in the message body to bypass the outbound protection that prevents
    message content from being interpreted as SMTP commands. A downstream mail server that hasn't yet fixed
    the SMTP smuggling vulnerability can be tricked into treating part of the message body as new SMTP
    commands, allowing injection of spoofed email. This is the same vulnerability class as CVE-2023-51764 and
    CVE-2023-51766. Where you control the receiving mail servers, ensure they reject bare carriage returns in
    message data. Update to non-vulnerable version. No publicly available exploits are known. (CVE-2026-33604)

  - An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command
    before authenticating. If running in high-security mode (default for community releases), only the
    attacker's own connection is terminated. If running in high-performance mode (default for Pro releases),
    all connections handled by the same managesieve-login process are terminated. Repeating the attack can
    cause denial of service for Sieve script management. Restrict network access to the ManageSieve service to
    trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
    (CVE-2026-33605)

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且廠商未提供可用的修補程式。

  - 未經身份驗證的攻擊者可以向 ManageSieve 登錄進程發送一個被截斷的引號引數，這使其在消耗 CPU 的無限循環中旋轉。這可能會導致 Sieve 指令碼管理性能下降或拒絕服務，並且重複連接可能會消耗伺服器上所有可用的 CPU。監控系統是否有異常的 CPU 使用率並終止有問題的進程。將 ManageSieve 服務的網路存取限制為受信任的用戶端。更新至無弱點版本。目前尚無已知的公開漏洞。
    (CVE-2026-40019)

請注意，Nessus 依賴供應商報告的套件存在。

Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - 未经认证的攻击者可将截断的引用参数发送至 ManageSieve 登录进程，使其在无限循环中旋转，并消耗 CPU。这可能导致 Sieve 脚本管理性能下降或拒绝服务，并且重复连接可消耗服务器上的所有可用 CPU。监控系统以了解异常的 CPU 使用情况并终止有问题的进程。将对 ManageSieve 服务的网络访问限制为受信任的客户端。更新到无漏洞版本。尚无已知的公开利用漏洞。
    (CVE-2026-40019)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

Linux/Unix ホストには、ベンダーが提供するパッチが利用できない脆弱性の影響を受ける複数のパッケージがインストールされています。

  - 認証されていない攻撃者が、切り捨てられた引用符付きの引数を ManageSieve ログインプロセスに送信し、無限ループでスピンさせて CPU を消費する可能性があります。これにより、Sieve スクリプト管理の劣化またはサービス拒否が発生する可能性があり、接続を繰り返すことでサーバー上の使用可能なすべての CPU が消費される可能性があります。システムの異常な CPU 使用率を監視し、問題のあるプロセスを強制終了します。ManageSieve サービスへのネットワークアクセスを、信頼できるクライアントに制限してください。脆弱でないバージョンに更新してください。一般に利用可能な悪用は知られていません。
    (CVE-2026-40019)

Nessus は、ベンダーによって報告されたパッケージの存在に依存していることに注意してください。

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which     makes it spin in an infinite loop consuming CPU. This can cause degradation or denial of service for Sieve     script management, and repeated connections can consume all available CPU on the server. Monitor system     for abnormal CPU usage and kill the offending process. Restrict network access to the ManageSieve service     to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
    (CVE-2026-40019)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Published	Updated	Severity
446515	Alpine: multiple dovecot packages: security update to 2.4.5-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	8/29/2026	8/29/2026	critical
446515	Alpine: multiple dovecot packages: security update to 2.4.5-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	8/29/2026	8/29/2026	critical
341516	Linux Distros 未修補弱點：CVE-2026-40019	Nessus	Misc.	8/29/2026	9/2/2026	medium
341516	Linux Distros 未修补的漏洞：CVE-2026-40019	Nessus	Misc.	8/29/2026	9/2/2026	medium
341516	Linux Distros のパッチ未適用の脆弱性: CVE-2026-40019	Nessus	Misc.	8/29/2026	9/2/2026	medium
341516	Linux Distros Unpatched Vulnerability : CVE-2026-40019	Nessus	Misc.	8/29/2026	9/2/2026	medium

Detections

Analytics

Plugins Search

critical

critical

medium

medium

medium

medium