CVE-2026-14586VulnerabilityPublished 10 Aug 2026Updated 10 Nov 2026

SUSE · Security update for unbound

Affects SUSESource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-14586· Medium 5.9

Not known to be exploited · CVSS 5.9 Medium : upgrade SUSE to 1.25.2 when convenient.

Data as of 10 Nov 2026, 20:06 UTC

CVSS 3.1 base score

5.9Medium

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 1.25.2

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 22 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Unbound to 1.25.2.

Affected software

Product	Affected	Fixed in
NLnet LabsUnbound	Affected >=1.22.0 <1.25.2	Fixed in 1.25.2

Description

This update for unbound fixes the following issues: Update to version 1.25.2. Security issues fixed: - CVE-2026-14586: DoS via assertion in `libngtcp2` for DNS-over-QUIC environments with high concurrency (bsc#1271879). - CVE-2026-32665: Remote DNS-over-QUIC denial of service due to `quic-size` budget bypass (bsc#1271873). - CVE-2026-40691: DoS due to heap overflow via single bad DNSCrypt query over TCP (bsc#1271875). - CVE-2026-41637: Degradation of resolution service due to improperly accounted client-terminated DNS-over-QUIC queries (bsc#1271891). - CVE-2026-42955: Ghost domain window can be extended by up to one cached TTL configured value for A/AAAA glue records (bsc#1271892). - CVE-2026-44621: Libunbound applications configured with `unwanted-reply-threshold` could eventually be abruptly terminated (bsc#1271876). - CVE-2026-44687: Off-by-one error in `harden-below-nxdomain` logic can shadow a stub/forward zone by a legitimate parent's `NXDOMAIN` (bsc#1271893). - CVE-2026-44690: Cross-zone wildcard cache poisoning via `RRSIG.labels` manipulation (bsc#1271877). - CVE-2026-46582: Replay of a wildcard `rrset` as another piece of data triggers poisoning in the server expired reply path (bsc#1271894). - CVE-2026-50045: `max-global-quota` bypass via single client queries for a deeply nested name under a DNSSEC-signed parent (bsc#1271878). - CVE-2026-50046: Possible heap use-after-free in an error path when a DoT forwarded query is jostled out (bsc#1271882). - CVE-2026-50243: `response-ip`/`rpz` can rewrite BOGUS answers instead of returning SERVFAIL (bsc#1271880). - CVE-2026-50248: BOGUS configured primary hostname accepted for XFR in auth/rpz zones (bsc#1271881). - CVE-2026-50251: Attacker supplied `0.0.0.0`/`::` glue triggers defensive full-cache flush (bsc#1271883). - CVE-2026-50252: Possible cache poisoning attack by mapping source port population per thread (bsc#1271884). - CVE-2026-54478: DNS Cookie bypass when proxy-protocol with with `answer-cookie:yes` is used (bsc#1271895). - CVE-2026-55708: Privacy/configuration issue when adding local data in views through `unbound-control` (bsc#1271896). - CVE-2026-55717: `serve-expired-client-timeout` and `response-ip` CNAME redirect could lead to a crash (bsc#1271886). - CVE-2026-55973: DoS due to stack overflow triggered crash when `dns-error-reporting: yes` is set (bsc#1271874). - CVE-2026-55990: Crash via crafted client UDP query due to DNSCrypt faulty configuration (bsc#1271887). - CVE-2026-55991: Remote DNS-over-QUIC (DoQ) flow-control reacheable assertion failure in `libngtcp2` (bsc#1271888). - CVE-2026-56416: Possible heap buffer overflow when validator canonicalizes RDATA that contains domain name (bsc#1271889). - CVE-2026-56444: Degradation of resolution service when `discard-timeout` and `serve-expired-client-timeout` are combined in unusual configuration (bsc#1271890). Other updates and bugfixes: - Version 1.25.2: + Features: * TTL behavior changes: cached records reaching TTL 0 are expired; TTL 0 upstream answers are no longer cached by cachedb; serve-expired-reply-ttl is now capped by the original TTL value; TTL decoding updated to adhere to RFC 8767 section 4 * Add new statistics: num.queries.replyaddr_limit and requestlist.current.replies * Add 'log-thread-id' configuration option to log the system-wide Linux thread ID for easier debugging * Add ECC-GOST12 support per RFC 9558 (available as contrib/gost12.patch) * Allow synthesized DNAME TTL=0 to be served from cache within a 1-second grace period, reducing recursion for TTL=0 DNAMEs (RFC 2308) * Fix DoT/DoH/DoQ to reload certificates on config reload without requiring a full restart; fast_reload now supports changes to tls-service-key, tls-service-pem and tls-cert-bundle * Allow ip@port notation in control-interface configuration * Add iter-scrub-rrsig option (default: 8) to limit the number of RRSIGs processed by the scrubber * Add 'tls-protocols' configuration option to select which TLS protocol versions are used; TLSv1.2 is re-enabled by default * Add pthread_setname_np support for named threads + Bug Fixes: * Fix handle leak in pythonmod on pythonmod_init * Fix crash when mesh_detect_cycle_found() is called with no mesh state * Fix modstack_call_init to use the original string when it has changed * Fix fr_atomic_copy_cfg * Fix auth-zone empty label for $ORIGIN when downloading via HTTP * Fix respip and dns64 to be usable simultaneously; RPZ now works with DNS64 * Fix HTTPS and QUIC not being enabled when port is listed in interface-automatic-ports * Allow wait-limit-cookie: 0 to disable cookie-validated wait limits * Fix FIPS mode in OpenSSL causing unit test failure * Fix discard-timeout to only drop UDP, not stream connections * Reply with SERVFAIL when the wait-limit is exceeded * A

GCVE source: db.gcve.eu
Csaf Category: csaf_security_advisory
Csaf Version: 2.0
Publisher: SUSE Product Security Team
Advisory ID: openSUSE-SU-2026:21550-1
Vendor Severity: high
CVE Count: 24
Additional Cves: CVE-2026-32665, CVE-2026-40622, CVE-2026-40691, CVE-2026-41637, CVE-2026-42955, CVE-2026-44621, CVE-2026-44687, CVE-2026-44690, CVE-2026-46582, CVE-2026-50045, CVE-2026-50046, CVE-2026-50243, CVE-2026-50248, CVE-2026-50251, CVE-2026-50252, CVE-2026-54478, CVE-2026-55708, CVE-2026-55717, CVE-2026-55973, CVE-2026-55990, CVE-2026-55991, CVE-2026-56416, CVE-2026-56444

References

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