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CVE-2026-55708— Privacy/configuration issue when adding local data in views through 'unbound-control'

CVSS 3.1 · Low EPSS 0.12% · P2

Possible ATT&CK Techniques 1AI

T1564 · Hide Artifacts

Affected Version Matrix 1

VendorProductVersion RangeStatus
NLnet LabsUnbound1.6.0< 1.25.2affected
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I. Basic Information for CVE-2026-55708

Vulnerability Information
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Vulnerability Title
Privacy/configuration issue when adding local data in views through 'unbound-control'
Source: CVE Program / CVE List V5
Vulnerability Description
In NLnet Labs Unbound 1.6.0 up to and including 1.25.1, the 'view_local_data' and 'view_local_datas' commands of 'unbound-control' create a bare local zones tree for an already configured named view when the view is configured with no local data to begin with. However, the creation through the control interface omits adding the default-protected zones (e.g., RFC 1918 reverse, AS112 zones, .onion, .localhost). Once the local zone tree exists without the defaults, every query for a default-protected name from a client mapped to that view escapes to the public DNS via the iterator instead of being answered locally, bypassing local policy expectations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不安全的默认资源初始化
Source: CVE Program / CVE List V5
Vulnerability Title
NLnet Labs Unbound 配置错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLnet Labs Unbound是荷兰NLnet Labs组织的域名系统解析服务器。 NLnet Labs Unbound 1.6.0至1.25.1版本存在配置错误漏洞，该漏洞源于通过控制接口创建本地区域树时未添加默认保护区域，可能导致客户端对默认保护名称的查询绕过本地策略而转发到公共DNS。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
NLnet LabsUnbound 1.6.0 ~ 1.25.2 -

II. Public POCs for CVE-2026-55708

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III. Intelligence Information for CVE-2026-55708

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Vendor Advisories for CVE-2026-55708 (1)

Same Patch Batch · NLnet Labs · 2026-07-22 · 24 CVEs total

CVE-2026-559737.5 HIGH'dns-error-reporting: yes' leads to stack buffer overflow
CVE-2026-446907.5 HIGHCross-zone wildcard cache poisoning via RRSIG.labels manipulation
CVE-2026-326657.5 HIGHRemote DNS-over-QUIC denial of service due to `quic-size` budget bypass
CVE-2026-406917.5 HIGHPacket of death for DNSCrypt over TCP
CVE-2026-502486.5 MEDIUMBOGUS configured primary hostname accepted for XFR in auth/rpz zones
CVE-2026-500465.9 MEDIUMPossible heap use-after-free in an error path when a DoT forwarded query is jostled out
CVE-2026-557175.9 MEDIUM'serve-expired-client-timeout' and 'response-ip' CNAME redirect could lead to a crash
CVE-2026-559915.9 MEDIUMRemote DNS-over-QUIC (DoQ) flow-control assertion failure in libngtcp2
CVE-2026-559905.9 MEDIUMPacket of death for a DNSCrypt misconfigured Unbound
CVE-2026-446215.9 MEDIUMLibunbound applications configured with 'unwanted-reply-threshold' could eventually be abr
CVE-2026-528635.9 MEDIUMMemory corruption could lead to crash and denial of service
CVE-2026-564445.9 MEDIUMDegradation of resolution service when 'discard-timeout' and 'serve-expired-client-timeout
CVE-2026-145865.9 MEDIUMAssertion in libngtcp2 when under pressure in high concurrency DNS-over-QUIC environments
CVE-2026-502515.3 MEDIUMAttacker supplied '0.0.0.0'/'::' glue triggers defensive full-cache flush
CVE-2026-500455.3 MEDIUM'max-global-quota' reset by DNSSEC validation restarts
CVE-2026-564164.8 MEDIUMPossible heap buffer overflow when validator canonicalizes RDATA that contains domain name
CVE-2026-429553.7 LOWExtra fix for CVE-2026-40622 to also clamp the TTL of A/AAAA records disallowing a one-tim
CVE-2026-544783.7 LOWDNS Cookie bypass when combined with proxy-protocol use
CVE-2026-446873.7 LOWOff-by-one error in 'harden-below-nxdomain' logic can shadow a stub/forward zone by a legi
CVE-2026-465823.7 LOWA wildcard replay, as another piece of data, triggers poisoning in the serve expired reply

Showing top 20 of 24 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Unbound
Same vendor: NLnet Labs
Same weakness: CWE-1188

V. Comments for CVE-2026-55708

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