Fedora alert FEDORA-2026-51cdd1292b (dnsdist)
| From: | updates--- via package-announce <package-announce@lists.fedoraproject.org> | |
| To: | package-announce@lists.fedoraproject.org | |
| Subject: | [SECURITY] Fedora 44 Update: dnsdist-2.0.6-1.fc44 | |
| Date: | Mon, 15 Jun 2026 00:51:20 +0000 | |
| Message-ID: | <20260615005120.AD69B6D737@bastion01.rdu3.fedoraproject.org> | |
| Archive-link: | Article |
-------------------------------------------------------------------------------- Fedora Update Notification FEDORA-2026-51cdd1292b 2026-06-15 00:48:35.285145+00:00 -------------------------------------------------------------------------------- Name : dnsdist Product : Fedora 44 Version : 2.0.6 Release : 1.fc44 URL : https://dnsdist.org Summary : Highly DNS-, DoS- and abuse-aware loadbalancer Description : dnsdist is a highly DNS-, DoS- and abuse-aware loadbalancer. Its goal in life is to route traffic to the best server, delivering top performance to legitimate users while shunting or blocking abusive traffic. -------------------------------------------------------------------------------- Update Information: Bug Fixes: CVE-2026-33254: An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default CVE-2026-33257: An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The web server is disabled and restricted by an ACL by default CVE-2026-33260: An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The web server is disabled and restricted by an ACL by default CVE-2026-33593: A client can trigger a divide by zero error leading to crash by sending a crafted DNSCrypt query CVE-2026-33595: A client can trigger excessive memory allocation by generating a lot of errors responses over a single DoQ and DoH3 connection, as some resources were not properly released until the end of the connection. DOQ and DoH3 are disabled by default CVE-2026-33596: A client might theoretically be able to cause a mismatch between queries sent to a backend and the received responses by sending a flood of perfectly timed queries that are routed to a TCP-only or DNS over TLS backend CVE-2026-33597: A crafted query containing an invalid DNS label can prevent the PRSD detection algorithm executed via DynBlockRulesGroup:setSuffixMatchRule or DynBlockRulesGroup:setSuffixMatchRuleFFI from being executed CVE-2026-33598: A cached crafted response can cause an out-of-bounds read if custom Lua code calls getDomainListByAddress() or getAddressListByDomain() on a packet cache CVE-2026-33599: A rogue backend can send a crafted SVCB response to a Discovery of Designated Resolvers request, when requested via either the autoUpgrade (Lua) option to newServer or auto_upgrade (YAML) settings. DDR upgrade is not enabled by default CVE-2026-33602: A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value, triggering an out-of-bounds write leading to a denial of service CVE-2026-33594: A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection. Outgoing DoH is disabled by default -------------------------------------------------------------------------------- ChangeLog: * Fri Jun 5 2026 Filipe Rosset <rosset.filipe@gmail.com> - 2.0.6-1 - update to 2.0.6 fixes rhbz#2460540 * Fri May 29 2026 Miroslav Suchý <msuchy@redhat.com> - 2.0.3-2 - rebuild for https://fedoraproject.org/wiki/Changes/Protobuf_5.x/6.x -------------------------------------------------------------------------------- References: [ 1 ] Bug #2460830 - CVE-2026-33260 dnsdist: insufficient input validation of internal webserver [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460830 [ 2 ] Bug #2460831 - CVE-2026-33260 dnsdist: insufficient input validation of internal webserver [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460831 [ 3 ] Bug #2460832 - CVE-2026-33257 dnsdist: insufficient input validation of internal webserver [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460832 [ 4 ] Bug #2460833 - CVE-2026-33257 dnsdist: insufficient input validation of internal webserver [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460833 [ 5 ] Bug #2460834 - CVE-2026-33596 dnsdist: TCP backend stream ID overflow [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460834 [ 6 ] Bug #2460835 - CVE-2026-33596 dnsdist: TCP backend stream ID overflow [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460835 [ 7 ] Bug #2460836 - CVE-2026-33599 dnsdist: out-of-bounds read in service discovery [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460836 [ 8 ] Bug #2460837 - CVE-2026-33599 dnsdist: out-of-bounds read in service discovery [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460837 [ 9 ] Bug #2460838 - CVE-2026-33597 dnsdist: insufficient input validation of internal webserver [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460838 [ 10 ] Bug #2460839 - CVE-2026-33597 dnsdist: insufficient input validation of internal webserver [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460839 [ 11 ] Bug #2460840 - CVE-2026-33595 dnsdist: DoQ/DoH3 excessive memory allocation [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460840 [ 12 ] Bug #2460841 - CVE-2026-33595 dnsdist: DoQ/DoH3 excessive memory allocation [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460841 [ 13 ] Bug #2460842 - CVE-2026-33594 dnsdist: outgoing DoH excessive memory allocation [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460842 [ 14 ] Bug #2460843 - CVE-2026-33594 dnsdist: outgoing DoH excessive memory allocation [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460843 [ 15 ] Bug #2460844 - CVE-2026-33602 dnsdist: off-by-one access when processing crafted UDP responses [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460844 [ 16 ] Bug #2460845 - CVE-2026-33602 dnsdist: off-by-one access when processing crafted UDP responses [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460845 [ 17 ] Bug #2460846 - CVE-2026-33254 dnsdist: resource exhaustion via DoQ/DoH3 connections [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460846 [ 18 ] Bug #2460847 - CVE-2026-33254 dnsdist: resource exhaustion via DoQ/DoH3 connections [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460847 [ 19 ] Bug #2460848 - CVE-2026-33598 dnsdist: out-of-bounds read in cache inspection via Lua [epel-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460848 [ 20 ] Bug #2460849 - CVE-2026-33598 dnsdist: out-of-bounds read in cache inspection via Lua [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460849 [ 21 ] Bug #2460851 - CVE-2026-33593 dnsdist: denial of service via crafted DNSCrypt query [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2460851 -------------------------------------------------------------------------------- This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-51cdd1292b' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgr... All packages are signed with the Fedora Project GPG key. More details on the GPG keys used by the Fedora Project can be found at https://fedoraproject.org/keys --------------------------------------------------------------------------------
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