VulnerabilityPublished 8 Nov 2026

CVE-2026-123583: hickory-dns · Acceptance of Extraneous Untrusted Data With Trusted Data

Affects hickory-dnsSource CVE Database V5

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Not known to be exploited · CVSS 6.3 Medium : upgrade to 0.26.2 when convenient.

Data as of 8 Nov 2026, 02:03 UTC

CVSS 4.0 base score

6.3Medium

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

Thin evidence

One scorer or none

CVSS scores by source
CNA (VulnCheck)	CVSS 4.0	6.3
CNA (VulnCheck)	CVSS 3.1	3.7

Patch: Available – fixed in 0.26.2

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: Present
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

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

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, 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: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: Present: The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: a race condition must be won to successfully exploit the vulnerability (the successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker, or the attack may need to be launched multiple times against a single target before being successful); the attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 8 Nov 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 7 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 hickory-dns to 0.26.2.

Affected software

Product	Affected	Fixed in
hickory-dnshickory-dns	Affected >=0.25.0 <=0.25.2	Fixed in–
hickory-dnshickory-dns	Affected >=0.26.0 <0.26.2	Fixed in 0.26.2
crates.iohickory-dns`pkg:cargo/hickory-dns`Other threats	Affected >=0.25.0 <=0.25.2 >=0.26.0 <0.26.2	Fixed in 0.26.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available in Hickory DNS version 0.26.2 that fixes this vulnerability. Users should upgrade to version 0.26.2 or later to remediate the issue. Since this is a cloud service, the vendor manages remediation for hosted deployments; verify with the vendor that updates have been applied. No additional mitigation actions are indicated by the vendor advisory.

Description

CVE-2026-123583 is a vulnerability in Hickory DNS recursive resolver versions 0.25.0 through 0.25.2 and hickory-resolver versions 0.26.0 before 0.26.2. The flaw involves the failure to apply out-of-bailiwick filtering to negative DNS responses, allowing attackers to inject crafted out-of-bailiwick records. This can facilitate cache poisoning and make exploitation of other DNSSEC verification flaws easier. The issue is fixed in version 0.26.2.

Impact

Successful exploitation allows attackers to inject malicious DNS records into the resolver cache via crafted negative responses, potentially leading to cache poisoning. This undermines DNS integrity and can facilitate further attacks leveraging DNSSEC verification flaws. The CVSS 4.0 score of 6.3 indicates a medium severity with network attack vector, low attack complexity, no privileges required, no user interaction, and partial impact on integrity.

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Affected software

Description

AI analysisMachine-generated, updated 8 Nov 2026, 02:03 UTC

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