SUSE-SU-2026:24135-1

This update for unbound fixes the following issues:

• CVE-2026-77860: 'serve-expired' can bypass Unbound 'wait-limit' (bsc#1280403).
• CVE-2026-77955: Possible ZONEMD verification bypass window (bsc#1280404).
• CVE-2026-78227: Use-after-free in DoQ stream output buffer on reset re-transmission (bsc#1280405).
• CVE-2026-80225: Possible degradation of service from continuous queries on the same TCP/DoT connection (bsc#1280406).
• CVE-2026-81634: Possible heap buffer overflow during DNSSEC canonicalization (bsc#1280409).
• CVE-2026-81642: Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY (bsc#1280411).
• CVE-2026-82717: CNAME synthesis could lead to heap corruption (bsc#1280412).
• CVE-2026-82720: Use-after-free in DoH stream cleanup code path (bsc#1280413).
• CVE-2026-85501: Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC (bsc#1280414).

Changes for unbound:

• Update to 1.26.1:

• Update icannbundle.pem certificates in unbound-anchor, valid for 2009-2029 and 2025-2045
• Add max-transfer-size and max-transfer-time options to limit auth-zone and rpz transfer size and time, default disabled
• Overload local_data_remove in unbound-control to also remove specific records
• Add local-zone types block_aaaa, block_a_wdata and block_aaaa_wdata; fix respip+dns64 to use original A records instead of ones already modified by respip
• ipsecmod hook script now needs to start with '#!/bin/sh', it is executed with execv instead of system for security
• Server now continues to start if a secondary zone fails to load from its zonefile, or if a primary zonefile is missing; $INCLUDE is no longer allowed in secondary zone zonefiles
• Auth-zone and RPZ zones now drop out-of-zone content on load
• Primary hostname for zone transfers can now use CNAME(s)
• Fix windows 64bit build for libssp dependency
• Update IANA portlist
• Fix heap out-of-bounds write via size_t-to-int truncation in setup_if()/outside_network_create() for large num_ports values
• Fix to clean up log ids after a failure to start a worker thread
• Relax assertions after the TTL 0 handling change in cachedb and packet_rrset_copy_region
• Fix val_find_DS to check the result of packet_rrset_copy_region before using it
• Fix that dns64 answers check the AAAA query is DNSSEC validated, improving RFC6147 conformance
• Fix allocation-failure hardening of rrset cache wildcard storage and canonical NSEC owner replacement
• Fix DNSSEC validation and DNSKEY size calculation for noncanonical RSA DNSKEYs with leading zeroes
• Fix mixed class referrals to use the query class
• Fix serve-expired responses from cachedb to not store bogus data
• Fix lame server detection for selfpointed glue records
• Fix cleanup of DoH sessions when the same query is on multiple streams
• Fix for signed same-owner CNAME and ordinary RRset responses
• Fix mesh new client/callback to roll back added address, tcp mesh state and callback on initialization failure
• Fix autotrust state-file line overflow that could give a hold-down bypass
• Fix to limit the DSNS per-label walk in the iterator
• Fix that the ratelimit is decremented on successful referrals
• Fix msgencode insert_query assertion for a local_alias
• Fix to reset the tcp-timeout before applying a load based reduction
• Fix to correctly decrement per-netblock tcp connection limits
• Fix, in depth, for respip rewrite of dns64 responses
• Fix that dns64 with subnetcache does not write ECS scoped answers to the global cache
• Fix ipset module name-too-long checks and race conditions on the local name buffer and socket close
• Fix validator to cap the number of ANY RRsets it validates and shorten the wait timer
• Fix race condition causing segfault when starting threads
• Fix header_seen detection for trust anchor files to detect the id line
• Fix heap use-after-free in class response processing when at least two distinct classes are configured
• Fix negative cache to work with NSEC3 records without salt
• Fix parse of svcbparam ech, it had an incorrect length
• Fix that quotation and escaping works the same in auth-zone url content as in zonefile reads
• Fix ipset module to use larger domain name buffers and check buffer lengths
• Fix PROXYv2 header read and consume to check the header size
• Fix negative cache NSEC3 nodata proof to use the correct message size
• Fix fast_reload for when a ZONEMD lookup is in progress
• Fix that validation canonicalization of domain names in rdata checks buffer bounds
• Fix dump_cache to use a larger record buffer and check that an owner name does not collide with BADRR
• Fix that dns64 cleans up the allocated message if the adjust routines fail, and checks for malformed A/AAAA in auth-zones
• Fix pythonmod script read for numeric overflow
• Fix configure to detect the correct QUIC early-data function and to check for the ngtcp2_crypto_ossl header
• Fix compile with OpenSSL 4.0.1, and with OpenSSL 1.0.2 and earlier in server cleanup
• Fix that auth-zone/rpz allow-notify addresses and netblocks are available from start, and fix the probe step skip
• Fix to perform a full transfer periodically to stop increasing memory usage for rpz zones
• Fix assertion failure for a long HTTP header that fills the buffer, and buffer overflow with lower than default size and http transfer
• Fix that misconfigured iter-scrub-ns: 0 causes request failures
• Fix fast_reload handling of in-progress ZONEMD lookups and of removing an auth zone while its lookups are in progress
• Fix integer overflow in infra-cache-max-rtt calculation and for very high values of sock-queue-timeout
• Fix erroneous DNS error report values after a bogus AAAA query
• Fix fast_reload to not terminate the server on config errors for key files
• Fix log of an aliased qname to not use freed region memory
• Fix DNAME synthesis from cache to keep using 0TTL entries within a sliding window without surpassing RRSIG expiry
• Fix that dns64 bypasses the rpz-passthru rule during synthesis
• Fix to disallow $INCLUDE for secondary zones; failed loads now clear the zone data so there is no partial zone
• Fix zone read to allow SVCB records in unknown format that cannot be written out
• Fix that a half-written trust anchor file does not crash the server at runtime
• Fix that auth-zone and RPZ zones drop out-of-zone records
• Fix that dns64 honors the forward-no-cache and stub-no-cache options
• Fix that a signed wildcard NSEC is checked before use, so it does not allow insecure DS proofs inappropriately
• Fix several crashes after malloc failure: half-built local_alias, RPZ list, delegation point cleanup, dns64_inform_super, new_local_rrset for RPZ qname trigger, doq connection setup, ngtcp2_conn_server_new, TCP accept handling, rpz_strip_nsdname, edns subnet addrtree insert, and rpz response create
• Fix that a zonefile-only zone continues server startup with a warning if the file is missing on start
• Fix that dnscrypt configuration does not crash on a secret/public key mismatch, and duplicate files are skipped
• Fix locking in libunbound ub_ctx_set_event
• Fix that libunbound pipe functions fail with an error after an event base is set
• Fix incorrect cleanup after an allocation failure for a delegation point
• Fix that the server does not crash if shared memory cannot be created for shm-enable
• Fix auth primary host name lookup to allow CNAMEs
• Fix memory leak on DNAME 0TTL records
• Fix that fast_reload disown of the auth zone transfer task cleans up the chunk list
• Fix unbound-checkconf to check for auth-zone download filename collisions
• Fix malloc failure in auth-zone insert rr to avoid an empty node and infinite loop
• Fix that unbound-control auth_zone_reload stops answering from the zone after a read failure
• Fix stats pipe draining after a malloc failure so internal messaging stays correct, and the server no longer exits on stats pipe communication failure
• Fix that fast_reload does not terminate the server if random init for DNS cookies fails
• Fix thread setname for dnstap and fast_reload thread start
• Add libunbound/remote.h, a shared header with prototypes for remote control connections
• Fix DEREF_AFTER_NULL on worker_init when stat_timer allocation fails with an out of memory error
• Fix DoH POST requests missing content-length causing :status 400 from strict resolvers like Cloudflare and Mullvad
• Fix randomness generation on macOS/iOS under chroot
• Fix ipsecmod deref on null in ipsecmod-whitelist after OOM, and possible deref on null after reply_find_answer_rrset()
• Fix that DoQ responses were never padded; pad-responses now applies to comm_doq per RFC 9250 section 5.4
• Fix log printout error in the fix for CVE-2026-50248 when the primary name is bogus
• Fix NSEC3 proofs to check the b32 name matches the signer name; RRSIGs are no longer valid when this does not match
• Fix aggressive negative cache to not insert NSEC records with an overreaching next owner name outside the trust anchor's bailiwick
• Fix mesh cycle detection for respip CNAME loop with tagged clients
• Fix unbound-anchor to check the return value of X509_NAME_get_text_by_NID for the emailaddress
• Fix locking of the shared_ports structure during initialisation, and of the anchor structure when a file is set during header parsing
• Fix memory leak in xfer_set_masters() error path in authzone
• Fix to use tls-port after a referral when tls-upstream is set
• Fix pthread detection on Solaris 11.4
• Fix to call OPENSSL_cleanup on exit when it is defined
• pythonmod: check the return value after ftell()