UN
Product
Unbound
by Nlnetlabs · last CVE Sep 16, 2026
73
CVEs
0
On KEV
10.0
Max CVSS
0
New 30D
Severity mix
Critical 12High 23Medium 25Low 8
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Add Unbound to your stack to get only the CVEs that touch what you run.

CVECVSSEPSSPublishedSummary · affected versions
CVE-2026-42960
10.0
0%
May 20
Possible cache poisoning via promiscuous records for the authority section
Affected: before 1.25.1
CVE-2026-82717
9.8
1%
Sep 16
CNAME synthesis could lead to heap corruption
Affected: before 1.26.1
CVE-2026-81642
9.8
1%
Sep 16
Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY
Affected: before 1.26.1
CVE-2026-33278
9.8
1%
May 20
Possible arbitrary code execution during DNSSEC validation
Affected: 1.19.1 before 1.25.1
CVE-2019-25042
9.8
3%
Apr 27
Unbound before 1.9.5 allows an out-of-bounds write via a compressed name in rdata_copy
Affected: before 1.9.5
CVE-2019-25039
9.8
3%
Apr 27
Unbound before 1.9.5 allows an integer overflow in a size calculation in respip/respip.c
Affected: before 1.9.5
CVE-2019-25038
9.8
3%
Apr 27
Unbound before 1.9.5 allows an integer overflow in a size calculation in dnscrypt/dnscrypt.c
Affected: before 1.9.5
CVE-2019-25035
9.8
3%
Apr 27
Unbound before 1.9.5 allows an out-of-bounds write in sldns_bget_token_par
Affected: before 1.9.5
CVE-2019-25034
9.8
3%
Apr 27
Unbound before 1.9.5 allows an integer overflow in sldns_str2wire_dname_buf_origin, leading to an out-of-bounds write
Affected: before 1.9.5
CVE-2019-25033
9.8
2%
Apr 27
Unbound before 1.9.5 allows an integer overflow in the regional allocator via the ALIGN_UP macro
Affected: before 1.9.5
CVE-2019-25032
9.8
3%
Apr 27
Unbound before 1.9.5 allows an integer overflow in the regional allocator via regional_alloc
Affected: before 1.9.5
CVE-2026-50252
9.3
0%
Jul 22
Possible cache poisoning attack by mapping source port population per thread
Affected: 1.4.22 before 1.25.2
CVE-2026-85501
7.5
0%
Sep 16
Retrap: Novel Vulnerabilities to launch Algorithmic Complexity Attacks on DNSSEC
Affected: before 1.26.1
CVE-2026-81634
7.5
0%
Sep 16
Possible heap buffer overflow during DNSSEC canonicalization
Affected: before 1.26.1
CVE-2026-80225
7.5
0%
Sep 16
Possible degradation of service from continuous queries on the same TCP/DoT connection
Affected: before 1.26.1
CVE-2026-55973
7.5
0%
Jul 22
'dns-error-reporting: yes' leads to stack buffer overflow
Affected: 1.23.0 before 1.25.2
CVE-2026-44690
7.5
0%
Jul 22
Cross-zone wildcard cache poisoning via RRSIG.labels manipulation
Affected: 1.7.0 before 1.25.2
CVE-2026-40691
7.5
0%
Jul 22
Packet of death for DNSCrypt over TCP
Affected: 1.9.0 before 1.25.2
CVE-2026-32665
7.5
0%
Jul 22
Remote DNS-over-QUIC denial of service due to `quic-size` budget bypass
Affected: 1.22.0 before 1.25.2
CVE-2026-42959
7.5
1%
May 20
Crash during DNSSEC validation of malicious content
Affected: before 1.25.1
CVE-2026-42944
7.5
1%
May 20
Heap overflow with multiple NSID, COOKIE, PADDING EDNS options
Affected: 1.14.0 before 1.25.1
CVE-2026-41292
7.5
1%
May 20
Long list of incoming EDNS options degrades performance
Affected: before 1.25.1
CVE-2026-40622
7.5
0%
May 20
Another 'ghost domain names' attack variant
Affected: 1.16.2 before 1.25.1
CVE-2024-1931
7.5
3%
Mar 7
NLnet Labs Unbound version 1.18.0 up to and including version 1.19.1 contain a vulnerability that can cause denial of service by a certain code path that can lead to an infinite…
Affected: 1.18.0 before 1.19.2
CVE-2023-50387
7.5
100%
Feb 14
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more…
Affected: before 1.19.1
CVE-2022-3204
7.5
2%
Sep 26
A vulnerability named 'Non-Responsive Delegation Attack' (NRDelegation Attack) has been discovered in various DNS resolving software
Affected: through 1.16.2
CVE-2019-25041
7.5
2%
Apr 27
Unbound before 1.9.5 allows an assertion failure via a compressed name in dname_pkt_copy
Affected: before 1.9.5
CVE-2019-25040
7.5
2%
Apr 27
Unbound before 1.9.5 allows an infinite loop via a compressed name in dname_pkt_copy
Affected: before 1.9.5
CVE-2019-25037
7.5
2%
Apr 27
Unbound before 1.9.5 allows an assertion failure and denial of service in dname_pkt_copy via an invalid packet
Affected: before 1.9.5
CVE-2019-25036
7.5
2%
Apr 27
Unbound before 1.9.5 allows an assertion failure and denial of service in synth_cname
Affected: before 1.9.5
CVE-2020-10772
7.5
1%
Nov 27
An incomplete fix for CVE-2020-12662 was shipped for Unbound in Red Hat Enterprise Linux 7, as part of erratum RHSA-2020:2414
Affected: 1.6.6-5
CVE-2020-12663
7.5
4%
May 19
Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers
Affected: before 1.10.1
CVE-2020-12662
7.5
3%
May 19
Unbound before 1.10.1 has Insufficient Control of Network Message Volume, aka an "NXNSAttack" issue
Affected: before 1.10.1
CVE-2019-16866
7.5
4%
Oct 3
Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query
Affected: before 1.9.4
CVE-2019-18934
7.3
3%
Nov 19
Unbound 1.6.4 through 1.9.4 contain a vulnerability in the ipsec module that can cause shell code execution after receiving a specially crafted answer
Affected: 1.6.4 through 1.9.4
CVE-2026-78227
6.5
0%
Sep 16
Use-after-free in DoQ stream output buffer on reset re-transmission
Affected: 1.22.0 before 1.26.1
CVE-2026-50248
6.5
0%
Jul 22
BOGUS configured primary hostname accepted for XFR in auth/rpz zones
Affected: 1.7.0 before 1.25.2
CVE-2022-30699
6.5
1%
Aug 1
Novel "ghost domain names" attack by updating almost expired delegation information
Affected: before 1.16.2
CVE-2022-30698
6.5
1%
Aug 1
Novel "ghost domain names" attack by introducing subdomain delegations
Affected: before 1.16.2
CVE-2026-82720
5.9
0%
Sep 16
Use-after-free in DoH stream cleanup code path
Affected: 1.12.0 before 1.26.1
CVE-2026-56444
5.9
0%
Jul 22
Degradation of resolution service when 'discard-timeout' and 'serve-expired-client-timeout' are combined in unusual configuration
Affected: 1.20.0 before 1.25.2
CVE-2026-55991
5.9
0%
Jul 22
Remote DNS-over-QUIC (DoQ) flow-control assertion failure in libngtcp2
Affected: 1.22.0 before 1.25.2
CVE-2026-55990
5.9
0%
Jul 22
Packet of death for a DNSCrypt misconfigured Unbound
Affected: 1.7.0 before 1.25.2
CVE-2026-55717
5.9
0%
Jul 22
'serve-expired-client-timeout' and 'response-ip' CNAME redirect could lead to a crash
Affected: 1.10.0 before 1.25.2
CVE-2026-52863
5.9
0%
Jul 22
Memory corruption could lead to crash and denial of service
Affected: 1.25.0 before 1.25.2
CVE-2026-50046
5.9
0%
Jul 22
Possible heap use-after-free in an error path when a DoT forwarded query is jostled out
Affected: 1.15.0 before 1.25.2
CVE-2026-44621
5.9
0%
Jul 22
Libunbound applications configured with 'unwanted-reply-threshold' could eventually be abruptly terminated
Affected: before 1.25.2
CVE-2026-44608
5.9
0%
May 20
Use after free and crash under special conditions in RPZ code
Affected: 1.14.0 before 1.25.1
CVE-2019-25031
5.9
2%
Apr 27
Unbound before 1.9.5 allows configuration injection in create_unbound_ad_servers.sh upon a successful man-in-the-middle attack against a cleartext HTTP session
Affected: before 1.9.5
CVE-2020-28935
5.5
0%
Dec 7
NLnet Labs Unbound, up to and including version 1.12.0, and NLnet Labs NSD, up to and including version 4.3.3, contain a local vulnerability that would allow for a local symlink…
Affected: before 1.13.0
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