{"id":"CVE-2026-80225","title":"In NLnetLabs Unbound up to and including 1.26.0, a degradation of service vulnerability is present in the TCP/DoT reading procedure where there is no limit on consecutive reads","summary":"In NLnetLabs Unbound up to and including 1.26.0, a degradation of service vulnerability is present in the TCP/DoT reading procedure where there is no limit on consecutive reads. A malicious actor that can stream and sustain a rate of dis…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-770","CWE-1050"],"vendor":"NLnet Labs","product":"Unbound","affected":["Unbound < 1.26.1"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:41:10.423","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80225","references":[{"url":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-80225.txt","label":"sep@nlnetlabs.nl"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80225.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-80225"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2535055"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80225"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80225"},{"url":"https://access.redhat.com/errata/RHSA-2026:68590"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-16T14:32:57.188145Z"},"ingestedAt":"2026-09-16T08:52:29.598Z","epss":0.00312,"epssPercentile":0.24282,"patched":["hardened_images"],"slug":"CVE-2026-80225","body":"## Overview\n\nIn NLnetLabs Unbound up to and including 1.26.0, a degradation of service vulnerability is present in the TCP/DoT reading procedure where there is no limit on consecutive reads. A malicious actor that can stream and sustain a rate of distinct uncached names over the TCP/DoT connection, monopolizes a single worker's entire event loop for as long as its writes stay ahead of the drain.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80225.json)\n- **RHSA-2026:68590** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68590)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}