nbdkit-security(1)

🌸 nbdkit-security — information about past security issues in nbdkit

okay bestie, this is nbdkit-security(1) from the NBDKIT manual, and it's basically the receipts page 💅 no cap.

✨ NAME ✨

nbdkit-security — information about past security issues in nbdkit

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🫶 DESCRIPTION 🫶

This page details past security issues found in nbdkit. like, the whole glow-up history of "oops, we found a thing, we fixed the thing" ✨

For how to report new security issues, see the "SECURITY.md" file in the top level source directory, also available online here:

https://gitlab.com/nbdkit/nbdkit/blob/master/SECURITY.md

found something? tell us, don't sit on it, i'm begging 🙏

💀 CVE-2019-14850 denial of service due to premature opening of back-end connection

See the full announcement and links to mitigation, tests and fixes here:

https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/YR77GRSM2GE5W7XDXNHOPHTGCZEZ7RMP/

💀 CVE-2019-14851 assertion failure by issuing commands in the wrong order

This CVE was caused by the fix to the previous issue. yes bestie, the fix to the fix. it happens to literally everyone.

See the full announcement and links to mitigation, tests and fixes here:

https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/message/KZMJDBRRPPVOQSD5EK6NDTXSKK6J7AYX/

💀 CVE-2021-3716 structured read denial of service attack against starttls

See the full announcement and links to mitigation, tests and fixes here:

https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/GQ6HPFKEEDTHQLO764NLGXG7YCVIENGF/

💀 CVE-2025-47711 denial of service attack by client sending maximum size block status

See the full announcement and links to mitigation, tests and fixes here:

https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/message/67E7AASHHADIY7VAD3FFW2I67LTWVWYF/

💀 CVE-2025-47712 denial of service attack by client sending large unaligned size block status

See the full announcement and links to mitigation, tests and fixes here:

https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/message/67E7AASHHADIY7VAD3FFW2I67LTWVWYF/

🦋 denial of service attack by client sending unaligned block status

See the patch here:

https://lists.libguestfs.org/archives/list/guestfs@lists.libguestfs.org/thread/EQTMAKGDP53WYOUBCEKWLCWAJHVUNSXX/

Full announcement and links to mitigation coming. she's still loading, give her a sec ⏳

🦋 denial of service attacks in split plugin

See the upstream commits:

https://gitlab.com/nbdkit/nbdkit/-/commit/fc588a8af9316b187f87ea0dead0f3de644f3135
https://gitlab.com/nbdkit/nbdkit/-/commit/0a583bbda20b58c10173154cfb93a0e0cdf9fac8

🦋 denial of service attack in cow filter

This filter is working as intended but we documented that you should only use this filter with trusted clients. read that again, bestie. trusted clients ONLY. this isn't a "probably fine" situation, it's an "i know exactly who's connecting to me" situation 💅 See:

https://gitlab.com/nbdkit/nbdkit/-/commit/8d5e20b15f90438f8a565837fede4ca18da64d6d

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👀 SEE ALSO 👀

nbdkit(1).

👑 AUTHORS 👑

Eric Blake

Richard W.M. Jones

🎀 COPYRIGHT 🎀

Copyright Red Hat

📜 LICENSE 📜

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

•   Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

•   Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

•   Neither the name of Red Hat nor the names of its contributors may be
    used to endorse or promote products derived from this software
    without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
THE POSSIBILITY OF SUCH DAMAGE.

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and that's the whole page, bestie 💖 this one's version nbdkit-1.48.1, dated 2026-08-29, and it's page nbdkit-security(1) out of the NBDKIT manual — stay safe out there, patch your stuff, and only trust the clients you actually know 🫶✨