Most recent entries from all https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Wed, 30 Sep 2026 12:59:11 +0000 CVE-2026-78227 — Use-after-free in DoQ stream output buffer on reset re-transmission https://vulnerability.circl.lu/vuln/cve-2026-78227 <p><strong>Affected:</strong> NLnet Labs Unbound</p> <p>NLnet Labs Unbound 1.22.0 up to and including 1.26.1, has a use-after-free vulnerability when compiled for DNS-over-QUIC support with &#39;--with-libngtcp2&#39;. Each DoQ stream owns an output buffer that holds the DNS response. ngtcp2&#39;s retransmission buffer keeps a shallow pointer into the output buffer for as long as a STREAM frame may be resent. On a client RESET_STREAM, the output buffer is freed but ngtcp2 still holds the matching retransmission entries. The next PTO timeout makes ngtcp2 re-encode the STREAM frame and copy from the freed buffer. A malicious actor that can query Unbound over DoQ and that withholds ACKs, sends RESET_STREAM, and waits for PTO, reaches this use-after-free with no privilege. This leads to retransmissions against freed memory and eventually an abnormal server exit under a 20-query spray.</p> <p><strong>Affected:</strong> NLnet Labs Unbound</p> <p>NLnet Labs Unbound 1.22.0 up to and including 1.26.1, has a use-after-free vulnerability when compiled for DNS-over-QUIC support with &#39;--with-libngtcp2&#39;. Each DoQ stream owns an output buffer that holds the DNS response. ngtcp2&#39;s retransmission buffer keeps a shallow pointer into the output buffer for as long as a STREAM frame may be resent. On a client RESET_STREAM, the output buffer is freed but ngtcp2 still holds the matching retransmission entries. The next PTO timeout makes ngtcp2 re-encode the STREAM frame and copy from the freed buffer. A malicious actor that can query Unbound over DoQ and that withholds ACKs, sends RESET_STREAM, and waits for PTO, reaches this use-after-free with no privilege. This leads to retransmissions against freed memory and eventually an abnormal server exit under a 20-query spray.</p> https://vulnerability.circl.lu/vuln/cve-2026-78227