https://cve.radiocsirt.org Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Tue, 06 Oct 2026 10:20:28 +0000 https://cve.radiocsirt.org/vuln/cve-2026-77860 <p><strong>Affected:</strong> NLnet Labs Unbound</p> <p>In NLnetLabs Unbound 1.20.0 up to and including 1.26.0, a vulnerability on the &#39;serve-expired&#39; code path can cause a double decrement on the &#39;wait-limit&#39; counter per client IP essentially bypassing one of the counter measures that was introduced for DNSBomb (CVE-2024-33655). A malicious actor can exploit this by controlling an authoritative zone with short TTL, so cached entries expire quickly. Each &#39;slow&#39; query, one the attacker&#39;s authoritative never answers, is followed by one query for an expired cached name, which is answered immediately via the &#39;serve-expired&#39; path and decrements the counter twice. This second query was named &#39;pump&#39;. By alternating slow queries and pumps, the attacker keeps the per-client counter at or below the configured &#39;wait-limit&#39; indefinitely, and can hold an arbitrary number of pending queries from a single source IP, up to the global mesh quota (num-queries-per-thread); eventually bypassing one of the counter measures introduced for DNSBomb (CVE-2024-33655). This vulnerability is present on the &#39;serve-expired&#39; code path.</p> <p><strong>Affected:</strong> NLnet Labs Unbound</p> <p>In NLnetLabs Unbound 1.20.0 up to and including 1.26.0, a vulnerability on the &#39;serve-expired&#39; code path can cause a double decrement on the &#39;wait-limit&#39; counter per client IP essentially bypassing one of the counter measures that was introduced for DNSBomb (CVE-2024-33655). A malicious actor can exploit this by controlling an authoritative zone with short TTL, so cached entries expire quickly. Each &#39;slow&#39; query, one the attacker&#39;s authoritative never answers, is followed by one query for an expired cached name, which is answered immediately via the &#39;serve-expired&#39; path and decrements the counter twice. This second query was named &#39;pump&#39;. By alternating slow queries and pumps, the attacker keeps the per-client counter at or below the configured &#39;wait-limit&#39; indefinitely, and can hold an arbitrary number of pending queries from a single source IP, up to the global mesh quota (num-queries-per-thread); eventually bypassing one of the counter measures introduced for DNSBomb (CVE-2024-33655). This vulnerability is present on the &#39;serve-expired&#39; code path.</p> https://cve.radiocsirt.org/vuln/cve-2026-77860