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。

  - 用户存储的邮件内容可经过特制，当管理员稍后使用流协议运行 dsync 时（例如在迁移期间），可将其解释为 dsync 协议命令。注入的命令可在迁移或复制期间修改目标上的邮箱状态，包括用户不应直接设置的内部邮箱属性。它还可能导致 dsync 错误。避免在包含不受信任内容的邮箱上运行具有流协议的 dsync。更新到无漏洞版本。尚无已知的公开利用漏洞。（CVE-2026-33606）

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 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。

  - 可以特製使用者儲存的郵件內容，以便在管理員稍後使用串流通訊協定執行 dsync 時 （例如在移轉期間） 將其解譯為 dsync 通訊協定命令。插入的命令可以在移轉或複寫期間修改目的地上的信箱狀態，包括使用者不應直接設定的內部信箱屬性。它還可能導致 dsync 錯誤。避免在具有不受信任內容的信箱上使用串流通訊協定執行 dsync。更新至無弱點版本。目前尚無已知的公開漏洞。（CVE-2026-33606）

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

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。

  - ユーザーが保存したメールコンテンツは、移行中など、管理者が後にストリームプロトコルで dsync を実行する際に、dsync プロトコルコマンドとして解釈されるように細工されることがあります。挿入されたコマンドは、ユーザーが直接設定できない内部メールボックス属性を含めて、移行またはレプリケーション中に宛先のメールボックスの状態を変更することができます。これは dsync エラーを引き起こす可能性もあります。信頼できないコンテンツのあるメールボックス上で、ストリームプロトコルで dsync を実行しないようにします。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-2026-33606)

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 remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21720-1 advisory.

    Update to 2.4.5.

    - CVE-2026-33263: `submission-login`: panic when `mail_max_userip_connections` is reached (bsc#1276794).
    - CVE-2026-27852: DoS by sending mail with bad header (bsc#1276799).
    - CVE-2026-33604: SMTP smuggling via missing dot-stuffing after bare carriage return (bsc#1276802).
    - CVE-2026-33605: `managesieve-login`: pre-auth crash (bsc#1276809).
    - CVE-2026-33606: `dsync`: mail content can cause `dsync` protocol injection (bsc#1276800).
    - CVE-2026-33607: IMAP `LIST` `match_sub()` exponential backtracking leading to CPU denial of service     (bsc#1276795).
    - CVE-2026-40013: stack buffer underflow in `pigeonhole` `ManageSieve` `CHECKSCRIPT/PUTSCRIPT`     (bsc#1276807).
    - CVE-2026-40014: CPU DoS via crafted references header (bsc#1276804).
    - CVE-2026-40015: `imap-hibernate` can be crashed (bsc#1276812).
    - CVE-2026-40017: CPU DoS via CRC32 hash collision in `strmap` (bsc#1276813).
    - CVE-2026-40018: MySQL multi-byte escaping performed incorrectly (bsc#1276810).
    - CVE-2026-40203: IMAP compression can reveal whether a small synced email body matches sender-chosen text       (bsc#1276815).
    - CVE-2026-40204: `lda_mailbox_autocreate` can bypass ACL restrictions (bsc#1276819).
    - CVE-2026-40205: OAuth2 `passdb` scope enforcement bypass via OR semantics in remote validation path     (bsc#1276820).
    - CVE-2026-42007: `sieve` `editheader` RCE (bsc#1276817).
    - CVE-2026-42008: `XCLIENT FORWARD= bare` token not namespaced (bsc#1276824).
    - CVE-2026-42391: `imap`: pre-login memory/CPU growth with `ID` command (bsc#1276835).
    - CVE-2026-42392: `imap-urlauth` leaks memory into user-visible error messages (bsc#1276829).
    - CVE-2026-42393: `doveadm_password` or api key length can be leaked with timing comparisons     (bsc#1276827).
    - CVE-2026-52687: `imap`: `COMPRESS ZSTD` can cause excessive memory usage (bsc#1276837).
    - CVE-2026-42395: single NUL-byte `XCLIENT FORWARD` payload crashes (bsc#1276826).
    - CVE-2026-52681: `sieve` resource usage tracking lost when active script changes (bsc#1276828).
    - CVE-2026-73208: `auth`: `db-oauth2`: `aud` claim used as fallback for missing scope claim (bsc#1276830).
    - CVE-2026-73209: `imap-login` crash due to self-recursion on zero-output decompress chunks (bsc#1276833).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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

  - Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an     administrator later runs dsync with the stream protocol, for example during a migration. Injected commands     can modify mailbox state on the destination during migration or replication, including internal mailbox     attributes that a user should not be able to set directly. It can also cause dsync errors. Avoid running     dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version. No     publicly available exploits are known. (CVE-2026-33606)

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
341529	Linux Distros 未修补的漏洞：CVE-2026-33606	Nessus	Misc.	8/29/2026	9/2/2026	medium
341529	Linux Distros 未修補弱點：CVE-2026-33606	Nessus	Misc.	8/29/2026	9/2/2026	medium
341529	Linux Distros のパッチ未適用の脆弱性: CVE-2026-33606	Nessus	Misc.	8/29/2026	9/2/2026	medium
342588	openSUSE 16: dovecot24 / dovecot24-backend-mysql / dovecot24-backend-pgsql / etc (openSUSE-SU-2026:21720-1)	Nessus	SuSE Local Security Checks	9/3/2026	9/3/2026	critical
341529	Linux Distros Unpatched Vulnerability : CVE-2026-33606	Nessus	Misc.	8/29/2026	9/2/2026	medium

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