Fedora alert FEDORA-2026-3170ee6a1c (unbound)
| From: | updates--- via package-announce <package-announce@lists.fedoraproject.org> | |
| To: | package-announce@lists.fedoraproject.org | |
| Subject: | [SECURITY] Fedora 43 Update: unbound-1.25.2-1.fc43 | |
| Date: | Fri, 31 Jul 2026 01:15:19 +0000 | |
| Message-ID: | <20260731011519.1E9BF794A1@bastion01.rdu3.fedoraproject.org> | |
| Archive-link: | Article |
-------------------------------------------------------------------------------- Fedora Update Notification FEDORA-2026-3170ee6a1c 2026-07-31 01:13:00.179901+00:00 -------------------------------------------------------------------------------- Name : unbound Product : Fedora 43 Version : 1.25.2 Release : 1.fc43 URL : https://nlnetlabs.nl/projects/unbound/ Summary : Validating, recursive, and caching DNS(SEC) resolver Description : Unbound is a validating, recursive, and caching DNS(SEC) resolver. The C implementation of Unbound is developed and maintained by NLnet Labs. It is based on ideas and algorithms taken from a java prototype developed by Verisign labs, Nominet, Kirei and ep.net. Unbound is designed as a set of modular components, so that also DNSSEC (secure DNS) validation and stub-resolvers (that do not run as a server, but are linked into an application) are easily possible. -------------------------------------------------------------------------------- Update Information: Update to 1.25.2 (rhbz#2506061) Security fixes: Fix CVE-2026-14586, Assertion in libngtcp2 when under pressure in high concurrency DNS-over-QUIC environments. Thanks to Kunta Chu, Kaihua Wang, and Jianjun Chen from Tsinghua University, for the report. Fix CVE-2026-32665, Remote DNS-over-QUIC denial of service due to quic-size budget bypass. Thanks to N0zoM1z0 (https://github.com/N0zoM1z0) for the report. In addition, thanks to Kunta Chu, Kaihua Wang, and Jianjun Chen from Tsinghua University, for also reporting this issue. In addition, thanks to Qifan Zhang, Palo Alto Networks, for also reporting this issue. In addition, thanks to Xuanchao Xie, for also reporting this issue. Fix CVE-2026-40691, Packet of death for DNSCrypt over TCP. Thanks to Qifan Zhang, Palo Alto Networks, for the report. In addition, thanks to Trung Nguyen (@everping) of CyStack, for also reporting this issue. Fix CVE-2026-41637, Degradation of resolution service from improperly accounted client-terminated DNS-over-QUIC queries. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-42955, Extra fix for CVE-2026-40622 to also clamp the TTL of A/AAAA records disallowing a one-time 'ghost domain' delegation renewal via glue records. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-44621, Libunbound applications configured with 'unwanted-reply- threshold' could eventually be abruptly terminated. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-44687, Off-by-one error in 'harden-below-nxdomain' logic can shadow a stub/forward zone by a legitimate parent's NXDOMAIN. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-44690, Cross-zone wildcard cache poisoning via RRSIG.labels manipulation. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-46582, A wildcard replay, as another piece of data, triggers poisoning in the serve expired reply path. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-50045, 'max-global-quota' reset by DNSSEC validation restarts. Thanks to Kunjie Shang, University of Science and Technology of China, for the report. Fix CVE-2026-50046, Possible heap use-after-free in an error path when a DoT forwarded query is jostled out. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-50243, 'response-ip'/'rpz' can rewrite BOGUS answers instead of returning SERVFAIL. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-50248, BOGUS configured primary hostname accepted for XFR in auth/rpz zones. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-50251, Attacker supplied 0.0.0.0/:: glue triggers defensive full- cache flush. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-50252, Possible cache poisoning attack by mapping source port population per thread. Thanks to Inbal Schussheim and Amit Klein, Hebrew University, for the report. Fix CVE-2026-52863, Memory corruption could lead to crash and denial of service. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-54478, DNS Cookie bypass when combined with proxy-protocol use. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-55708, Privacy/configuration issue when adding local data in views through 'unbound-control'. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-55717, 'serve-expired-client-timeout' and 'response-ip' CNAME redirect could lead to a crash. Thanks to Qifan Zhang, Palo Alto Networks, for the report. In addition, thanks to Xin Wang, Jiapeng Li, and Jiajia Liu, Northwestern Polytechnical University, for also reporting this issue. Fix CVE-2026-55973, 'dns-error-reporting: yes' leads to stack buffer overflow. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-55990, Packet of death for a DNSCrypt misconfigured Unbound. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-55991, Remote DNS-over-QUIC (DoQ) flow-control assertion failure in libngtcp2. Thanks to Qifan Zhang, Palo Alto Networks, for the report. In addition, thanks to Xuanchao Xie, for also reporting this issue. Fix CVE-2026-56416, Possible heap buffer overflow when validator canonicalizes RDATA that contains domain name. Thanks to Qifan Zhang, Palo Alto Networks, for the report. Fix CVE-2026-56444, Degradation of resolution service when 'discard-timeout' and 'serve-expired-client-timeout' are combined in unusual configuration. Thanks to Qifan Zhang, Palo Alto Networks, for the report. In addition, thanks to Xin Wang, Jiapeng Li, and Jiajia Liu, Northwestern Polytechnical University, for also reporting this issue. In addition, thanks to Haruki Oyama (Waseda University), for also reporting this issue. Source: https://nlnetlabs.nl/projects/unbound/download/#unbound-1... -------------------------------------------------------------------------------- ChangeLog: * Mon Jul 27 2026 Fedor Vorobev <fvorobev@redhat.com> - 1.25.2-1 - Update to 1.25.2 (rhbz#2506061) -------------------------------------------------------------------------------- References: [ 1 ] Bug #2491434 - CVE-2026-44390 unbound: Unbound: Denial of Service due to excessive resource consumption with large DNS Resource Record Sets [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2491434 [ 2 ] Bug #2491795 - CVE-2026-42534 unbound: Unbound: Denial of Service due to degraded resolution performance in jostle logic [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2491795 [ 3 ] Bug #2491930 - CVE-2026-41292 unbound: Unbound: Denial of Service via excessive EDNS options [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2491930 [ 4 ] Bug #2491940 - CVE-2026-41292 unbound: Unbound: Denial of Service via excessive EDNS options [fedora-43] https://bugzilla.redhat.com/show_bug.cgi?id=2491940 [ 5 ] Bug #2506061 - unbound-1.25.2 is available https://bugzilla.redhat.com/show_bug.cgi?id=2506061 [ 6 ] Bug #2506178 - CVE-2026-40691 unbound: Unbound: Denial of Service via crafted DNSCrypt query [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2506178 [ 7 ] Bug #2506420 - CVE-2026-56416 unbound: Unbound: Heap buffer overflow via malformed DNSSEC record [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2506420 [ 8 ] Bug #2506834 - CVE-2026-14586 unbound: Unbound: Denial of Service via assertion failure in DNS-over-QUIC environments [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2506834 [ 9 ] Bug #2507425 - CVE-2026-55991 unbound: Unbound: Denial of Service via crafted DNS-over-QUIC connection [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2507425 [ 10 ] Bug #2507454 - CVE-2026-54478 unbound: Unbound: DNS Cookie security bypass via incorrect server cookie calculation [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2507454 [ 11 ] Bug #2507649 - CVE-2026-55973 unbound: Unbound: Denial of Service via malformed EDNS Report-Channel option [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2507649 [ 12 ] Bug #2507650 - CVE-2026-44690 unbound: Unbound: Cache poisoning via insufficient RRSIG.Labels validation and premature cache writes [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2507650 [ 13 ] Bug #2507651 - CVE-2026-32665 unbound: Unbound: Denial of Service via improper validation of DNS-over-QUIC client length [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2507651 [ 14 ] Bug #2507955 - CVE-2026-50251 unbound: NLnet Labs Unbound: Denial of Service via crafted DNS glue records [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2507955 -------------------------------------------------------------------------------- This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-3170ee6a1c' 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 -------------------------------------------------------------------------------- -- _______________________________________________ package-announce mailing list -- package-announce@lists.fedoraproject.org To unsubscribe send an email to package-announce-leave@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-cond... List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/package-ann... Do not reply to spam, report it: https://forge.fedoraproject.org/infra/tickets/issues/new