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。

  - Libevent 是一個事件通知庫。在 2.2.2-alpha 之前 2.1.13 ，當 libevent 處理out_total_len為零的輸出緩衝區時，libevent 會在 buffer.c 中evbuffer_add_buffer_reference釋放後使用。
    evbuffer_free_all_chains釋放初始空鏈，而不重設 outbuf->first、outbuf->last 或 outbuf->last_with_datap，然後APPEND_CHAIN_MULTICAST取消參照懸空鏈指標。
    可驅動此緩衝區狀態的呼叫端可能會導致記憶體損毀或進程損毀。此問題已在 2.2.2-alpha 版 2.1.13 中修正。（CVE-2026-63381）

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

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。

  - Libevent 是一个事件通知库。2.1.13低于 2.2.2-alpha 的 libevent 在 evbuffer_add_buffer_reference 处理out_total_len为零的输出缓冲区时，buffer.c 中存在释放后使用。
    evbuffer_free_all_chains释放初始空链而不重置 outbuf->first、outbuf->last 或 outbuf->last_with_datap，APPEND_CHAIN_MULTICAST随后取消引用悬摆链指针。
    可驱动此缓冲区状态的调用程序可造成内存损坏或进程崩溃。此问题已在版本 2.1.13 和 2.2.2-alpha 中修复。（CVE-2026-63381）

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。

  - Libevent は、イベント通知ライブラリです。2.1.13および2.2.2-alphaより前では、out_total_lenが0の出力バッファをevbuffer_add_buffer_referenceが処理するとき、libeventはbuffer.cにメモリ解放後使用(Use After Free)があります。
    evbuffer_free_all_chainsは、outbuf->first、outbuf->last、または outbuf->last_with_datap をリセットせずに最初の空のチェーンを解放し、その後APPEND_CHAIN_MULTICASTダングリングチェーンポインターを逆参照します。
    このバッファ状態を駆動できる呼び出し元は、メモリ破損やプロセスのクラッシュを引き起こす可能性があります。この問題は、バージョン 2.1.13 および 2.2.2-alpha で修正されています。(CVE-2026-63381)

Nessus は、ベンダーから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。

リモートの Fedora 44 ホストには、FEDORA-2026-72d10c874d のアドバイザリに記載された複数の脆弱性の影響を受けるパッケージがインストールされています。

    # 2.1.13 に更新してください。

    この更新では、次のセキュリティの脆弱性が修正されています。

    - GHSA-fj29-64w6-73h6 CVE-2026-63383 <https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6>
    - GHSA-45c6-qx49-89m8 CVE-2026-63384 <https://github.com/libevent/libevent/security/advisories/GHSA-45c6-qx49-89m8>
    - GHSA-cvq5-vrvr-j338 CVE-2026-63388 <https://github.com/libevent/libevent/security/advisories/GHSA-cvq5-vrvr-j338>
    - GHSA-58rx-7448-jw47 CVE-2026-63387 <https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47>
    - GHSA-2gmv-p5m7-98p6 CVE-2026-63379 <https://github.com/libevent/libevent/security/advisories/GHSA-2gmv-p5m7-98p6>
    - GHSA-c2pj-cg4r-88c8 CVE-2026-63381 <https://github.com/libevent/libevent/security/advisories/GHSA-c2pj-cg4r-88c8>
    - GHSA-q39v-w2g7-gr8j CVE-2026-63382 <https://github.com/libevent/libevent/security/advisories/GHSA-q39v-w2g7-gr8j>
    - GHSA-jcwh-pvf2-73p2 CVE-2026-63385 <https://github.com/libevent/libevent/security/advisories/GHSA-jcwh-pvf2-73p2>

Tenable は、前述の記述ブロックを Fedora セキュリティアドバイザリから直接抽出しています。

Nessus はこれらの問題をテストしておらず、代わりにアプリケーションが自己報告するバージョン番号にのみ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.

  - Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a use-after-free     in buffer.c when evbuffer_add_buffer_reference processes an output buffer whose out_total_len is zero.
    evbuffer_free_all_chains frees the initial empty chain without resetting outbuf->first, outbuf->last, or     outbuf->last_with_datap, and APPEND_CHAIN_MULTICAST subsequently dereferences the dangling chain pointer.
    A caller that can drive this buffer state can cause memory corruption or a process crash. This issue is     fixed in versions 2.1.13 and 2.2.2-alpha. (CVE-2026-63381)

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

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-72d10c874d advisory.

    # Update to 2.1.13.

    The following security vulnerabilites are fixed in this update:

    - GHSA-fj29-64w6-73h6 CVE-2026-63383 <https://github.com/libevent/libevent/security/advisories/GHSA-     fj29-64w6-73h6>
    - GHSA-45c6-qx49-89m8 CVE-2026-63384     <https://github.com/libevent/libevent/security/advisories/GHSA-45c6-qx49-89m8>
    - GHSA-cvq5-vrvr-j338 CVE-2026-63388 <https://github.com/libevent/libevent/security/advisories/GHSA-     cvq5-vrvr-j338>
    - GHSA-58rx-7448-jw47 CVE-2026-63387     <https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47>
    - GHSA-2gmv-p5m7-98p6 CVE-2026-63379     <https://github.com/libevent/libevent/security/advisories/GHSA-2gmv-p5m7-98p6>
    - GHSA-c2pj-cg4r-88c8 CVE-2026-63381 <https://github.com/libevent/libevent/security/advisories/GHSA-c2pj-     cg4r-88c8>
    - GHSA-q39v-w2g7-gr8j CVE-2026-63382     <https://github.com/libevent/libevent/security/advisories/GHSA-q39v-w2g7-gr8j>
    - GHSA-jcwh-pvf2-73p2 CVE-2026-63385 <https://github.com/libevent/libevent/security/advisories/GHSA-jcwh-     pvf2-73p2>

Tenable has extracted the preceding description block directly from the Fedora 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 remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-728dd9f704 advisory.

    # Update to 2.1.13.

    The following security vulnerabilites are fixed in this update:

    - GHSA-fj29-64w6-73h6 CVE-2026-63383 <https://github.com/libevent/libevent/security/advisories/GHSA-     fj29-64w6-73h6>
    - GHSA-45c6-qx49-89m8 CVE-2026-63384     <https://github.com/libevent/libevent/security/advisories/GHSA-45c6-qx49-89m8>
    - GHSA-cvq5-vrvr-j338 CVE-2026-63388 <https://github.com/libevent/libevent/security/advisories/GHSA-     cvq5-vrvr-j338>
    - GHSA-58rx-7448-jw47 CVE-2026-63387     <https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47>
    - GHSA-2gmv-p5m7-98p6 CVE-2026-63379     <https://github.com/libevent/libevent/security/advisories/GHSA-2gmv-p5m7-98p6>
    - GHSA-c2pj-cg4r-88c8 CVE-2026-63381 <https://github.com/libevent/libevent/security/advisories/GHSA-c2pj-     cg4r-88c8>
    - GHSA-q39v-w2g7-gr8j CVE-2026-63382     <https://github.com/libevent/libevent/security/advisories/GHSA-q39v-w2g7-gr8j>
    - GHSA-jcwh-pvf2-73p2 CVE-2026-63385 <https://github.com/libevent/libevent/security/advisories/GHSA-jcwh-     pvf2-73p2>

Tenable has extracted the preceding description block directly from the Fedora 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 Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-106192 advisory.

    Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a use-after-free     in buffer.c when evbuffer_add_buffer_reference processes an output buffer whose out_total_len is zero.
    evbuffer_free_all_chains frees the initial empty chain without resetting outbuf->first, outbuf->last, or     outbuf->last_with_datap, and APPEND_CHAIN_MULTICAST subsequently dereferences the dangling chain pointer.
    A caller that can drive this buffer state can cause memory corruption or a process crash. This issue is     fixed in versions 2.1.13 and 2.2.2-alpha.

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

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

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-0a83f1b852 advisory.

    # Update to 2.1.13.

    The following security vulnerabilites are fixed in this update:

    - GHSA-fj29-64w6-73h6 CVE-2026-63383 <https://github.com/libevent/libevent/security/advisories/GHSA-     fj29-64w6-73h6>
    - GHSA-45c6-qx49-89m8 CVE-2026-63384     <https://github.com/libevent/libevent/security/advisories/GHSA-45c6-qx49-89m8>
    - GHSA-cvq5-vrvr-j338 CVE-2026-63388 <https://github.com/libevent/libevent/security/advisories/GHSA-     cvq5-vrvr-j338>
    - GHSA-58rx-7448-jw47 CVE-2026-63387     <https://github.com/libevent/libevent/security/advisories/GHSA-58rx-7448-jw47>
    - GHSA-2gmv-p5m7-98p6 CVE-2026-63379     <https://github.com/libevent/libevent/security/advisories/GHSA-2gmv-p5m7-98p6>
    - GHSA-c2pj-cg4r-88c8 CVE-2026-63381 <https://github.com/libevent/libevent/security/advisories/GHSA-c2pj-     cg4r-88c8>
    - GHSA-q39v-w2g7-gr8j CVE-2026-63382     <https://github.com/libevent/libevent/security/advisories/GHSA-q39v-w2g7-gr8j>
    - GHSA-jcwh-pvf2-73p2 CVE-2026-63385 <https://github.com/libevent/libevent/security/advisories/GHSA-jcwh-     pvf2-73p2>


Tenable has extracted the preceding description block directly from the Fedora 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 remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6493 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6493-1                   security@debian.org     https://www.debian.org/security/                                  Aron Xu     September 11, 2026                    https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : libevent     CVE ID         : CVE-2026-63379 CVE-2026-63381 CVE-2026-63382 CVE-2026-63383                      CVE-2026-63384 CVE-2026-63385 CVE-2026-63387 CVE-2026-63388

    Several vulnerabilities were discovered in libevent, an asynchronous event     notification library.

    The HTTP implementation (evhttp) handled Transfer-Encoding and     Content-Length headers, chunked-encoding line terminators, header line     folding and chunked trailers too permissively, which could allow HTTP     request smuggling, header injection or access control bypass when a     libevent-based server or client is combined with an HTTP proxy.

    Out-of-bounds memory accesses in the DNS (evdns), tagged RPC     (evtag/evrpc) and buffered socket (bufferevent) code, and a     use-after-free in evbuffer, could result in denial of service or     potentially the execution of arbitrary code when processing untrusted     input.

    For the stable distribution (trixie), these problems have been fixed in     version 2.1.13-stable-1~deb13u1.

    We recommend that you upgrade your libevent packages.

    For the detailed security status of libevent please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/libevent

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

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

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
338655	Linux Distros 未修補弱點：CVE-2026-63381	Nessus	Misc.	2026/8/21	2026/9/11	medium
338655	Linux Distros 未修补的漏洞：CVE-2026-63381	Nessus	Misc.	2026/8/21	2026/9/11	medium
338655	Linux Distros のパッチ未適用の脆弱性: CVE-2026-63381	Nessus	Misc.	2026/8/21	2026/9/11	medium
343966	Fedora 44:libevent(2026-72d10c874d)	Nessus	Fedora Local Security Checks	2026/9/9	2026/9/9	critical
338655	Linux Distros Unpatched Vulnerability : CVE-2026-63381	Nessus	Misc.	2026/8/21	2026/9/11	medium
343966	Fedora 44 : libevent (2026-72d10c874d)	Nessus	Fedora Local Security Checks	2026/9/9	2026/9/9	critical
344676	Fedora 43 : libevent (2026-728dd9f704)	Nessus	Fedora Local Security Checks	2026/9/11	2026/9/11	critical
342870	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: libevent (UTSA-2026-106192)	Nessus	Unity Linux Local Security Checks	2026/9/4	2026/9/4	medium
344983	Fedora 45 : libevent (2026-0a83f1b852)	Nessus	Fedora Local Security Checks	2026/9/11	2026/9/11	critical
344780	Debian dsa-6493 : libevent-2.1-7t64 - security update	Nessus	Debian Local Security Checks	2026/9/11	2026/9/11	critical

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