CVE-2026-56444
An attacker can exploit multiple vulnerabilities in Unbound to perform a denial of service attack, disclose information, manipulate data, and bypass security measures.
CSIRTS triage
- What
- Multiple vulnerabilities allow an attacker to perform denial of service, disclose information, and manipulate data.
- Who is affected
- Deployments of Unbound are affected.
- Urgency
- Remediation is medium urgency as the vulnerabilities are not currently exploited.
- Action
- Update Unbound to the latest version to mitigate these vulnerabilities.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.
Advisory coverage (3)
- medium[NEW] [medium] Unbound: Multiple vulnerabilitiescert-bund · 2026-07-27
- mediumCVE-2026-56444: In NLnet Labs Unbound 1.20.0 up to and including 1.25.1, when Unbound is configured with 'serv…nvd · 2026-07-22
- mediumCVE-2026-56444: Degradation of resolution service when 'discard-timeout' and 'serve-expired-client-timeout' ar…msrc · 2026-07-14
External references
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[](https://www.csirts.com/cve/CVE-2026-56444)