Linux Distros Unpatched Vulnerability : CVE-2026-40211

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at...

CVE-2026-40211

An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memo...

SUSE-SU-2026:2648-1 Security update for openssl-3

This update for openssl-3 fixes the following issues - CVE-2026-7383: Possible Heap Buffer Overflow in ASN.1 Multibyte String Conversion bsc1266340. - CVE-2026-9076: Out-of-Bounds Read in CMS Password-Based Decryption bsc1266341. - CVE-2026-34180: Heap Buffer Over-read in ASN.1 Content Parsing...

SUSE CVE-2026-40211

An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memo...

GO-2026-5756 AdGuard Home: DoQ-to-UDP State Reduction and Source-Port Oracle in github.com/AdguardTeam/AdGuardHome

AdGuard Home: DoQ-to-UDP State Reduction and Source-Port Oracle in github.com/AdguardTeam/AdGuardHome...

GO-2026-5583 CoreDNS has TSIG authentication bypass on DoT, DoH, DoH3, DoQ, and gRPC in github.com/coredns/coredns

CoreDNS has TSIG authentication bypass on DoT, DoH, DoH3, DoQ, and gRPC in github.com/coredns/coredns...

GO-2026-5288 Hysteria: A specially constructed quic package can crash the server OOM when the sniff is enabled in github.com/apernet/hysteria/core

Hysteria: A specially constructed quic package can crash the server OOM when the sniff is enabled in github.com/apernet/hysteria/core...

CVE-2026-40211 Denial of service via crafted DoH3 queries

An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memo...

CVE-2026-40211

An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memo...

CVE-2026-40211

An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memo...

EUVD-2026-39350

An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memo...

PT-2026-52383

Name of the Vulnerable Software and Affected Versions The product name cannot be determined affected versions not specified Description An attacker can send crafted DNS over HTTP/3 queries to trigger an exception that prevents a buffer from being freed immediately. While the buffer is eventually...

CVE-2026-11352

An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service against a curl or libcurl client. Because the helper function discards zero-length UDP datagrams before counting them toward the per-call packet budget, a connected QUIC peer can...

curl: libcurl: curl/libcurl: Remote denial of service via QUIC UDP receive function vulnerability

A flaw was found in curl and libcurl. A malicious HTTP/3 server can exploit an issue in the QUIC UDP receive function by continuously streaming empty UDP datagrams. This can lead to a remote denial of service DoS against a curl or libcurl client, as the helper function discards zero-length UDP...

CURL-CVE-2026-11352 QUIC zero-length UDP datagrams busy-loop

An issue in curl’s QUIC UDP receive function allows a malicious HTTP/3 server to trigger a remote denial of service against a curl or libcurl client. Because the helper function discards zero-length UDP datagrams before counting them toward the per-call packet budget, a connected QUIC peer can...

CVE-2026-53622

CVE-2026-53622 concerns Traefik’s HTTP/3 (QUIC) TLS configuration selection. When HTTP/3 is enabled, the TLS handshake uses an exact, case-sensitive lookup of the SNI to choose a TLS config, which fails to match wildcard hosts or mixed-case hostnames. If a router enforces mTLS via TLSOptions and ...

EUVD-2026-38576

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.7.3, there is a critical vulnerability in Traefik's HTTP/3 QUIC TLS configuration selection that allows unauthenticated clients to bypass router-specific mTLS enforcement. When HTTP/3 is enabled on an entrypoint, the TLS handshake...

CVE-2026-53622 Traefik: HTTP/3 mTLS bypass via exact SNI TLSOptions lookup for wildcard and mixed-case hosts

Traefik is an HTTP reverse proxy and load balancer. Versions prior to 3.7.3, 3.6.18, and 2.11.51 have a critical vulnerability in Traefik's HTTP/3 QUIC TLS configuration selection that allows unauthenticated clients to bypass router-specific mTLS enforcement. When HTTP/3 is enabled on an...

SUSE-SU-2026:22319-1 Security update for dnsdist

This update for dnsdist fixes the following issues - CVE-2026-0396: crafted DNS queries can allow to inject HTML content bsc1261236. - CVE-2026-0397: CORS misconfiguration can lead to information disclosure bsc1261237. - CVE-2026-24028: crafted DNS response packet can lead to an out-of-bounds rea...

OPENSUSE-SU-2026:21005-1 Security update for openssl-3

This update for openssl-3 fixes the following issues - CVE-2026-2673: TLS 1.3 servers may choose unexpected key agreement group bsc1259652. - CVE-2026-7383: Possible Heap Buffer Overflow in ASN.1 Multibyte String Conversion bsc1266340. - CVE-2026-9076: Out-of-Bounds Read in CMS Password-Based...