- Fix for signed same-owner CNAME and ordinary RRset responses.
Thanks to Xin Wang and Jiajia Liu, Northwestern Polytechnical
University, for the report.
Changelog entry.
- Fix CVE-2026-44390, Unbounded name compression in certain cases
causes degradation of service. Thanks to Qifan Zhang, Palo Alto
Networks, for the report.
- Fix CVE-2026-44390, Unbounded name compression in certain cases
causes degradation of service. Thanks to Qifan Zhang, Palo Alto
Networks, for the report.
- Fix CVE-2026-42960, Possible cache poisoning attack while following
delegation. Thanks to TaoFei Guo from Peking University, Yang Luo
and JianJun Chen, Tsinghua University, for the report.
- Fix CVE-2026-41292, Parsing a long list of incoming EDNS options
degrades performance. Thanks to GitHub user 'N0zoM1z0', also Qifan
Zhang from Palo Alto Networks, for the report.
- Fix CVE-2026-42944, Heap overflow and crash with multiple nsid,
cookie, padding EDNS options. Thanks to Qifan Zhang, Palo Alto
Networks, for the report.
- Fix for mixed class referrals, the resolver uses the query
class. Thanks to Xin Wang and Jiajia Liu, Northwestern
Polytechnical University, for the report.
- Fix DNSKEY size calculation for noncanonical RSA DNSKEYs
with leading zeroes for n. Thanks to Xin Wang and Jiajia Liu,
Northwestern Polytechnical University, for the report.
- Fix DNSSEC validation with libnettle for noncanonical RSA
DNSKEYs with leading zeroes for n. Thanks to Xin Wang and
Jiajia Liu, Northwestern Polytechnical University, for
the report.
- Fix for allocation-failure hardening of rrset cache wildcard
storage and canonical NSEC owner replacement. Thanks to Xin
Wang and Jiajia Liu, Northwestern Polytechnical University,
for the report.
- Fix that for dns64 answers, the AAAA query is checked to be
DNSSEC validated, when DNSSEC is enabled. This improves
the RFC6147 conformance of Unbound. Thanks to Xin Wang
and Jiajia Liu, Northwestern Polytechnical University, for
the report. In addition, thanks to Qifan Zhang, Palo Alto
Networks, for reporting it.
- Fix val_find_DS for robustness, to check the result of
packet_rrset_copy_region before using it. Thanks to Xin Wang
and Jiajia Liu, Northwestern Polytechnical University, for
the report.
- Fix for Heap Out-of-Bounds Write via size_t-to-int Truncation
in setup_if() - outside_network_create(). This fixes that
large values for num_ports do not overflow and create
invalid references after integer truncation. Thanks
to Karnakar Reddy (@karnakarreddi) for the report.
- 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.
Thanks to Qifan Zhang, Palo Alto Networks for the report.
- 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. Thanks to Qifan Zhang, Palo Alto Networks
for the report.
- 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. Thanks to TaoFei Guo from Peking
University and JianJun Chen from Tsinghua University for
the report.
- 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.
Thanks to Halil Oktay for the report.
- 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.
Thanks to Qifan Zhang, Palo Alto Networks for the report.
- Fix EDNS extended RCODE reflection. This fixes that
the server does not echo extended rcode values after class
chaos queries. Thanks to Qifan Zhang, Palo Alto Networks
for the report.
- 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. Thanks to Yuqi Qiu and
Xiang Li, Nankai University (AOSP Lab) for the report.
In addition, thanks to Qifan Zhang, Palo Alto Networks, for
noting the fingerprinting possibility, that is also fixed
with this.
Introduce new 'tls-protocols' configuration option (#1406)
- Introduce new 'tls-protocols' configuration option that specifies
which of the supported TLS protocols will be used.
This change invalidates some previous changes:
- TLSv1.2 is again enabled by default, but can be selectively turned off if
desired (related to #1303).
- The biefly introduced (not yet released) 'tls-use-system-versions'
configuration option, that addressed #1346, is reverted in favor of
'tls-protocols'.
- The briefly introduced (not yet released) '--enable-system-tls'
configure option, related to #1401, is no longer needed with the new
option and the current default.
- Review comment for checking out of memory condition
- 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. Thanks to Yuxiao Wu,
Tsinghua University for the report.
- 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.
- 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. Thanks
to Haruto Kimura (Stella) for the report.
- For #278: fast_reload can reload tls-service-key, tls-service-pem
and tls-cert-bundle changes. It checks the modification time of
the tls-service-key and tls-service-pem files for update.
- Fix #278: DoT: complete unbound restart required on certificate
renew. Fix so that a reload checks if the files have changed, and
if so, reload the contexts. Also for DoH, DoQ and outgoing DoT.
- Fix to ignore out-of-zone DNAME records for CNAME synthesis. Thanks
to Yuxiao Wu, Yiyi Wang, Zhang Chao, Baojun Liu, and Haixin Duan from
Tsinghua University.
projects / thirdparty / unbound.git / log
