-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Format: 1.8 Date: Thu, 17 Sep 2026 11:55:59 +0300 Source: unbound Binary: libunbound-dev libunbound8 libunbound8-dbgsym python3-unbound python3-unbound-dbgsym unbound unbound-anchor unbound-anchor-dbgsym unbound-dbgsym unbound-host unbound-host-dbgsym Architecture: arm64 Version: 1.26.1-0+deb13u1 Distribution: trixie-security Urgency: medium Maintainer: arm64 Build Daemon (arm-conova-04) Changed-By: Michael Tokarev Description: libunbound-dev - static library, header files, and docs for libunbound libunbound8 - library implementing DNS resolution and validation python3-unbound - library implementing DNS resolution and validation (Python3 bindi unbound - validating, recursive, caching DNS resolver unbound-anchor - utility to securely fetch the root DNS trust anchor unbound-host - reimplementation of the 'host' command Closes: 1096189 1142539 Changes: unbound (1.26.1-0+deb13u1) trixie-security; urgency=medium . * New upstream release fixing numerous security and other issues and contains some enhancements. . Traditionally in Debian, bugs in stable versions are fixed by providing a back-port of a fix from later upstream version to the version in Debian stable. With unbound, fixes in subsequent versions can not be applied directly to the version in Debian stable, as there were multiple other code changes in these areas. Many of these changes fixes other issues (security or not). Some changes are in areas with complex logic, hence requires creat care when back-porting to older releases. And the result of such back-porting becomes unique and rather unpredictable. So instead of trying to provide fixes for older version in Debian stable, we decided to provide current upstream version of unbound, - the same as currently available in Debian Sid. The packaging is made very similar too. . Recent security fixes: . o CVE-2026-81642 - severity: CRITICAL Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY o CVE-2026-81634 - severity: HIGH Possible heap buffer overflow during DNSSEC canonicalization o CVE-2026-82717 - severity: HIGH CNAME synthesis could lead to heap corruption o CVE-2026-77955 - severity: MEDIUM Possible ZONEMD verification bypass window o CVE-2026-78227 - severity: MEDIUM Use-after-free in DoQ stream output buffer on reset re-transmission o CVE-2026-80225 - severity: MEDIUM Possible degradation of service from continuous queries on the same TCP/DoT connection o CVE-2026-82720 - severity: MEDIUM Use-after-free in DoH stream cleanup code path o CVE-2026-85501 - severity: MEDIUM Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC o CVE-2026-77860 - severity: LOW 'serve-expired' can bypass Unbound 'wait-limit' o CVE-2026-32665 - severity: HIGH Remote DNS-over-QUIC denial of service due to `quic-size` budget bypass o CVE-2026-40691 - severity: HIGH Packet of death for DNSCrypt over TCP o CVE-2026-44690 - severity: HIGH Cross-zone wildcard cache poisoning via RRSIG.labels manipulation o CVE-2026-55973 - severity: HIGH 'dns-error-reporting: yes' leads to stack buffer overflow o CVE-2026-14586 - severity: MEDIUM Assertion in libngtcp2 when under pressure in high concurrency DNS-over-QUIC environments o CVE-2026-44621 - severity: MEDIUM Libunbound applications configured with 'unwanted-reply-threshold' could eventually be abruptly terminated o CVE-2026-50045 - severity: MEDIUM 'max-global-quota' reset by DNSSEC validation restarts o CVE-2026-50046 - severity: MEDIUM Possible heap use-after-free in an error path when a DoT forwarded query is jostled out o CVE-2026-50243 - severity: MEDIUM response-ip/rpz can rewrite BOGUS answers instead of returning SERVFAIL o CVE-2026-50248 - severity: MEDIUM BOGUS configured primary hostname accepted for XFR in auth/rpz zones o CVE-2026-50251 - severity: MEDIUM Attacker supplied 0.0.0.0/:: glue triggers defensive full-cache flush o CVE-2026-50252 - severity: MEDIUM Possible cache poisoning attack by mapping source port population per thread o CVE-2026-52863 - severity: MEDIUM Memory corruption could lead to crash and denial of service o CVE-2026-55717 - severity: MEDIUM 'serve-expired-client-timeout' and 'response-ip' CNAME redirect could lead to a crash o CVE-2026-55990 - severity: MEDIUM Packet of death for a DNSCrypt misconfigured Unbound o CVE-2026-55991 - severity: MEDIUM Remote DNS-over-QUIC (DoQ) flow-control assertion failure in libngtcp2 o CVE-2026-56416 - severity: MEDIUM Possible heap buffer overflow when validator canonicalizes RDATA that contains domain name o CVE-2026-56444 - severity: MEDIUM Degradation of resolution service when 'discard-timeout' and 'serve-expired-client-timeout' are combined in unusual configuration o CVE-2026-41637 - severity: LOW Degradation of resolution service from improperly accounted client-terminated DNS-over-QUIC queries o CVE-2026-42955 - severity: LOW 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 o CVE-2026-44687 - severity: LOW Off-by-one error in 'harden-below-nxdomain' logic can shadow a stub/forward zone by a legitimate parent's NXDOMAIN o CVE-2026-46582 - severity: LOW A wildcard replay, as another piece of data, triggers poisoning in the serve expired reply path o CVE-2026-54478 - severity: LOW DNS Cookie bypass when combined with proxy-protocol use o CVE-2026-55708 - severity: LOW Privacy/configuration issue when adding local data in views through 'unbound-control' . Other notable user-visible changes and fixes. For complete list, please see /usr/share/doc/unbound/changelog.gz . o ICANN Bundle Update: Refreshed icannbundle.pem certificates in unbound-anchor to include public keys valid for 2009–2029 and 2025–2045 o Transfer Limits: Added max-transfer-size and max-transfer-time directives to limit authorization zone (auth-zone) and RPZ transfer sizes and times to harden against unbounded transfers. o New Zone Types: Introduced block_aaaa static zone type to suppress AAAA queries, plus block_a_wdata and block_aaaa_wdata to support custom local data fallback. o Management Improvements: Overloaded local_data_remove to allow the removal of precise records. o Fix for the Jiggle Attack. The server is fixed to answer with errors for error cases, and does not stay silent. In addition, the error replies do not contain parts of the incoming query. This is more conformant, stops reflection and stops it as a covert channel. o Fix EDNS extended RCODE reflection. This fixes that the server does not echo extended rcode values after class chaos queries. o Fix for iterator RCODE handling of YXDOMAIN. This fixes that the server only accepts YXDOMAIN answers that contain a DNAME record. This stops bad answers, and checks that the authoritative server gives correct replies. o Fix for missing bounds check for decompressing dnames for downloaded authority zones. This fixes that the server could end up with malformed zone content after receiving truncated packet contents from an AXFR. In addition, the domain names in the SOA rdata are checked before the authority code picks up the zone serial. o Fix that upstream TLS connections are not reused as TLS connections for a different name, at the same IP. This checks that the tls name is correct when reusing the upstream connections. o Fix that signatures are not allowed with revoked dnskeys. o Fix that a DNAME with an unsigned CNAME is checked for the correct match. This stops that for certain zone configurations an unchecked unsigned CNAME could get secure status. o Fix handling of wildcard CNAMEs in the chain of trust. An improper wildcard in the chain of trust would send the retries to the wrong upstream. Also it could label the step in the chain of trust as secure, when it was not. o Introduce new 'tls-protocols' configuration option that specifies which of the supported TLS protocols will be used. o Fix RFC7766 compliance when client sends EOF over TCP. It stops pending replies and closes. o Fix to shorten RRSIG count in scrubber, this protects against an overly large number of RRSIGs. It can be configured with `iter-scrub-rrsig: 8`, it has default 8. o Fix for EDNS client subnet so that it does not store SERVFAIL in the global cache after a failed lookup, such as timeouts. A failure entry is stored in the subnet cache, for the query name, for a couple of seconds. Queries can continue to use the subnet cache during that time. o Fix to allow the control-interface config to use ip@port notation. o Fix to check for invalid http content length and chunk size, and to check the RR rdata field lengths when decompressing and inserting RRs from an authority zone transfer. This stops large memory use and heap buffer-overflow read errors. o Fix to ignore out-of-zone DNAME records for CNAME synthesis. Fix so that a reload checks if the files have changed, and if so, reload the contexts. Also for DoH, DoQ and outgoing DoT. o Apply cache TTL policy to DNAME and synthesized CNAME on wire path. o Fix for DNS Rebinding Bypass via SVCB/HTTPS Records in Unbound. o Allow synthesized DNAME TTL=0 to be served from cache within grace period. The responses are served from cache within a 1-second grace period. Reduces recursion when authoritative servers return DNAME with TTL=0 (RFC 2308). Response still returns TTL=0 to clients. o On Linux systems log the system-wide unique thread ID instead of Unbound's internal thread counter. o Introduce the 'log-thread-id' configuration option to manage logging the system-wide Linux thread ID for easier debugging with system tools. o Mesh reply counters. This adds statistics num.queries.replyaddr_limit and requestlist.current.replies. o Add extra statistic to track the number of signature validation operations. Adds 'num.valops' to extended statistics. o Fix for cname chain length with qtype ANY and qname minimisation. o Change default for so-sndbuf to 4m, to mitigate a cross-layer issue where the UDP socket send buffers are exhausted waiting for ARP/NDP resolution. o Increase default to `num-queries-per-thread: 2048`, when unbound is compiled with libevent. It makes saturation of the task queue more resource intensive and less practical. o DNS Error Reporting (RFC 9567). Introduces new configuration option 'dns-error-reporting' and new statistics for 'num.dns_error_reports'. o Redis read-only replica support. Introduces new 'redis-replica-*' options for the Redis cache backend. o Exempt loopback addresses from wait-limit. o Fix wait-limit-netblock and wait-limit-cookie-netblock config parse to allow two arguments. o Fast Reload. The unbound-control fast_reload is added. It reads changed config in a thread, then only briefly pauses the service threads, that keep running. DNS service is only interrupted briefly. o Make the default value of module-config "validator iterator" regardless of compilation options. --enable-subnet would implicitly change the value to enable the subnetcache module by default in the past. o Add unbound members group access to control key. o Add resolver.arpa and service.arpa to the default locally served zones. o Use TCP_NODELAY on TLS sockets to speed up the TLS handshake. o Serve expired cache update fixes. Fixes a regression bug with serve-expired that appeared in 1.22.0 and would not allow the iterator to update the cache with not-yet-validated entries resulting in increased outgoing traffic. Closes: #1142539 o The default value of serve-expired-ttl is set to 86400 (1 day) as suggested by RFC8767. o Increase the default of max-global-quota to 200 from 128 after operational feedback. Still keeping the possible amplification factor (CAMP related issues) in the hundreds. o Fix for the serve expired DNSSEC information fix, it would not allow current delegation information be updated in cache. The fix allows current delegation and validation recursion information to be updated, but as a consequence no longer has certain expired information around for later dnssec valid expired responses. o Statistics for discard-timeout and wait-limit. . * Other packaging changes: - d/rules,d/libunbound-dev.install: drop static library and deps (Closes: #1096189) - unbound-helper: do not update resolvconf if it is systemd-resolved - d/unbound.service: set empty DAEMON_OPTS= to avoid warning from systemd - d/upstream/signing-key.asc: update with the new upstream key - d/unbound.conf.d/remote-control.conf: fix typo Checksums-Sha1: 58a51d15b611f0038c9b54bec71edc81a9f92b0e 213576 libunbound-dev_1.26.1-0+deb13u1_arm64.deb 19889ee8f1f62838e4b85150814df7864c934281 1399560 libunbound8-dbgsym_1.26.1-0+deb13u1_arm64.deb a5cd92bd562d6a05783732e9e12bc22509f80cff 596588 libunbound8_1.26.1-0+deb13u1_arm64.deb 0fa292db54b64c886d6db9dd08e65c052e9f8808 166432 python3-unbound-dbgsym_1.26.1-0+deb13u1_arm64.deb 0e0a1f4616df7c5b1acf212dbbb362e8dcbf391f 245052 python3-unbound_1.26.1-0+deb13u1_arm64.deb cb6bc354c6157d652dd3e4ace39bee4aead1cdb0 59576 unbound-anchor-dbgsym_1.26.1-0+deb13u1_arm64.deb 193944f9b5443f9a631f5577566008340aeab380 221300 unbound-anchor_1.26.1-0+deb13u1_arm64.deb b7885f03b4dd32156a121d22e99115ecf5940f10 5731828 unbound-dbgsym_1.26.1-0+deb13u1_arm64.deb efb426805a66da54a8a3dc40fb16d9d36ae3d5bd 131992 unbound-host-dbgsym_1.26.1-0+deb13u1_arm64.deb 407c80bf83e56cddc2eb061e220d41ace95589a0 242160 unbound-host_1.26.1-0+deb13u1_arm64.deb bbb1aa2b30d8dacaf047383136e4086140d3e6c8 10584 unbound_1.26.1-0+deb13u1_arm64-buildd.buildinfo 6db57297c727b420ae25d237cda0c0bf3af30992 1055708 unbound_1.26.1-0+deb13u1_arm64.deb Checksums-Sha256: ebbf6c56311d6210c96510f06de9949d7598bc6952dcdf73e6e0f625ec4a352e 213576 libunbound-dev_1.26.1-0+deb13u1_arm64.deb 37a0d7b5d2b07679078e058382e4ea926d4ca0dfa17eca8a0ba1dbcf1380fe2c 1399560 libunbound8-dbgsym_1.26.1-0+deb13u1_arm64.deb 3e80f69a0f5c213765cb504844fd2206ab5e2769ba6437271224e44b3d34f61a 596588 libunbound8_1.26.1-0+deb13u1_arm64.deb bef2c87df1ec7f92ca19d6d7b845ea67f463907dbdd291172c645d4d29278778 166432 python3-unbound-dbgsym_1.26.1-0+deb13u1_arm64.deb f7da8c27d08a42ec2cbd44fadc394e4a89321164c528a5ad9ceea8c253e048ee 245052 python3-unbound_1.26.1-0+deb13u1_arm64.deb b12ae6b5d4edd85c0b6c0b508f69822fcbe341aa6301785253274a1ab4214bdc 59576 unbound-anchor-dbgsym_1.26.1-0+deb13u1_arm64.deb 89a40524f682916c7cc6972549f59698b56a3bbb3b886a83ccddf3321563af93 221300 unbound-anchor_1.26.1-0+deb13u1_arm64.deb b35395d9e6dc075589f8755400acfaabd0f1c330cfb5a2d251b81b478e86e55f 5731828 unbound-dbgsym_1.26.1-0+deb13u1_arm64.deb 3751fad4eeab736f0db41ca5642a714d7cbebce113c3ab686205a9304de5f84e 131992 unbound-host-dbgsym_1.26.1-0+deb13u1_arm64.deb cd302aaddd6a140827d4a06f98659b2f2d6b8cc6cc10cfec57cb5d53c1316ce8 242160 unbound-host_1.26.1-0+deb13u1_arm64.deb 19823ab7041181621e42128402c1d8bc8dcb504ce5bb693950ffb3fefd98a21a 10584 unbound_1.26.1-0+deb13u1_arm64-buildd.buildinfo 5c70abc6332ac4bd2010c7a3fedeee72eb8fc958df53a71ef0e43019dd9ae750 1055708 unbound_1.26.1-0+deb13u1_arm64.deb Files: b28d24e09ad3e5c70b3d1acc69ab8175 213576 libdevel optional libunbound-dev_1.26.1-0+deb13u1_arm64.deb c9f7921995336a0188f085384186d4eb 1399560 debug optional libunbound8-dbgsym_1.26.1-0+deb13u1_arm64.deb 43345a1d0c449f61ad19e486a62cb995 596588 libs optional libunbound8_1.26.1-0+deb13u1_arm64.deb 08e2ed073dcd2aa60eddcfa836939798 166432 debug optional python3-unbound-dbgsym_1.26.1-0+deb13u1_arm64.deb 69a38070f66b2383e4df4d38e3373169 245052 python optional python3-unbound_1.26.1-0+deb13u1_arm64.deb 90fbe465f24f60c47fcc8ab279488dbc 59576 debug optional unbound-anchor-dbgsym_1.26.1-0+deb13u1_arm64.deb c6d06040d5e493d0c25444b2d95b58c9 221300 net optional unbound-anchor_1.26.1-0+deb13u1_arm64.deb ea5c98712aa3c70c662f8c9e616be5dc 5731828 debug optional unbound-dbgsym_1.26.1-0+deb13u1_arm64.deb f8064b9c12095275666a57b834ce1742 131992 debug optional unbound-host-dbgsym_1.26.1-0+deb13u1_arm64.deb df8a234df0aaac50f93c4bcd1d19f29d 242160 net optional unbound-host_1.26.1-0+deb13u1_arm64.deb b052cb6ab062aeb66d751a424a976c0a 10584 net optional unbound_1.26.1-0+deb13u1_arm64-buildd.buildinfo 84b2537711959a72c83e61680e6c9388 1055708 net optional unbound_1.26.1-0+deb13u1_arm64.deb -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEgSZRd/+N1Ed3hy+mPMAxAOQQpzsFAmqtZ30ACgkQPMAxAOQQ pztWLRAAvF5wF7bUA4yDcIYYD37+Epq924IOpm6uI57svijav4/iPTbSk6Ke7n9n jVcsR793n0wyhsGyfRlJcYgNZVudtPuF1giFT+5wiNUWlaZBpFTMBuOCSj36wSHM 5SzU+U6vn60dje2mszpX6J2BCgu8LwqL5ccCK14p2WdAlIxR7DM/e285YPuVkFCt B3p6tHsZGCEtZDFtPxi/qcEflV0mPCQUbgBPSczlGLEluTPEk9L6HXRoFgJjWsCa dDjpd0Eot+WdD5843ImRwa3Kv51OZknxaasKdClx0k8GfNosLoFQRb8CA4M5tDL0 +jAUc86ZIbQp5iPss1s1DlMGCYAe8H+rSjspQ2k0gKxCETjt4mwoPW9pffFafDd3 aLa+4vMHPqlRO81EkQiuzmblbjZqVRmvRp29el6UC0Uh+WOsFg4BxVaUJOH1MuJA 3tlInxZiKoNp3mLTc/DCzvJzyEAHzVfYWpjTb9RFD2mlfKza+RYlsW/usjQb6kIv GE3f8lAha3p/CqeIjAEdrZ4TlgJs2UyfuudSwylx/fKGCZWwKrdDMoQPbV2m/M1I QpZas3PuBJxHuG7His3W7/RdqTYDCpjQQBI2VgPxpp1XMlwfYt+VUcspRHi4lDJe jw2Q6g8zKdar5+OR5bdfdT6F5GT5130Gg0yj9mvQ20S/TdeAUGs= =oiHP -----END PGP SIGNATURE-----