• NAME
• DESCRIPTION
  • CVE-2019-14850 denial of service due to premature opening of back-end connection
  • CVE-2019-14851 assertion failure by issuing commands in the wrong order
  • CVE-2021-3716 structured read denial of service attack against starttls
  • CVE-2025-47711 denial of service attack by client sending maximum size block status
  • CVE-2025-47712 denial of service attack by client sending large unaligned size block status
  • denial of service attack by client sending unaligned block status
  • denial of service attacks in split plugin
  • denial of service attack in cow filter
• SEE ALSO
• AUTHORS
• COPYRIGHT
• LICENSE

NAME

nbdkit-security - information about past security issues in nbdkit

DESCRIPTION

This page details past security issues found in nbdkit.

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

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.

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.

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

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.