CVE-2026-45557

MEDIUMNVD 5.85.8—

5.8

Technitium DNS Server aggressively tries to fetch missing RRSIG records or mismatched DNSKEY records. An attacker in control of a domain can cause a vulnerable system to generate excessive network traffic. Fixed in 15.0.

CVSS v3: 5.8
EG Score: 5.8(high)
EPSS: 11.2%
KEV: Not listed

Published

May 19, 2026

Last Modified

May 19, 2026

References (3)

9119a7d8-5eab-497f-8521-727c672e3725https://github.com/TechnitiumSoftware/DnsServer/blo/master/CHANGELOG.md#version-150
9119a7d8-5eab-497f-8521-727c672e3725https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-138-02.json
9119a7d8-5eab-497f-8521-727c672e3725https://www.cve.org/CVERecord?id=CVE-2026-45557

Vendor Advisories for CVE-2026-45557(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

GHSA-vpfg-gc96-vg45
GitHub Security AdvisoriesMedium
Technitium DNS Server aggressively tries to fetch missing RRSIG records or mismatched DNSKEY...

Frequently asked(5)

What is CVE-2026-45557?

CVE-2026-45557 is a medium vulnerability published on May 19, 2026. Technitium DNS Server aggressively tries to fetch missing RRSIG records or mismatched DNSKEY records. An attacker in control of a domain can cause a vulnerable system to generate excessive network traffic. Fixed in 15.0.

When was CVE-2026-45557 disclosed?

CVE-2026-45557 was first published in the National Vulnerability Database on May 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-45557 actively exploited?

CVE-2026-45557 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 11.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-45557?

CVE-2026-45557 has a CVSS v3 base score of 5.8 (NVD).

How do I remediate CVE-2026-45557?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45557, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-45557

📅 Published

🔄 Last Modified

🔗 References (3)

📣 Vendor Advisories for CVE-2026-45557(1)

❓ Frequently asked(5)