CVE-2026-42530

🛡️ CVE-2026-42530 - NGINX HTTP/3 QUIC Use-After-Free Vulnerability High-Severity Use-After-Free in NGINX HTTP/3 QUIC ⚠️ QPACK Encoder Stream Vulnerability 🔍 Overview CVE-2026-42530 is a use-after-free vulnerability in NGINX's ngxhttpv3module. A remote unauthenticated attacker can trigger it by...

CVE-2026-42530

CVE-2026-42530 Scanner for CVE-2026-42530, a use-after-free in nginx's HTTP/3 module. Affected: nginx 1.31.0, 1.31.1 Fixed: nginx 1.31.2 Usage pip install aioquic python3 scannerCVE-2026-42530.py port python3 scannerCVE-2026-42530.py --file hosts.txt How it works Opens two QPACK encoder streams o...

Uncontrolled Resource Consumption

io.netty, netty-codec-http3 is vulnerable to uncontrolled resource consumption. The vulnerability is due to improper validation and lack of size limits on QPACK encoder-stream string literals, which allows a remote unauthenticated attacker to exhaust server heap memory and trigger an...

Linux Distros Unpatched Vulnerability : CVE-2026-100662

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Netty's HTTP/3 codec io.netty:netty-codec-http3 versions 4.2.0.Final through 4.2.17.Final contain an uncontrolled resource consumption vulnerability in the QPAC...

CVE-2026-100660

A flaw was found in Netty's HTTP/3 codec netty-codec-http3. The HTTP/3 header compression QPACK encoder stores per-stream state indefinitely when remote clients do not acknowledge encoded data, as no memory limits are enforced. A remote, unauthenticated attacker can exploit this flaw by issuing...

UBUNTU-CVE-2026-100660

Netty's HTTP/3 codec io.netty:netty-codec-http3 from 4.2.0.Final through 4.2.17.Final retains unbounded per-stream QPACK encoder state. QpackEncoder stores a queue and a dynamic-table index tracker for every encoded field section that references the QPACK dynamic table, keyed by the peer-controll...

UBUNTU-CVE-2026-100662

Netty's HTTP/3 codec io.netty:netty-codec-http3 versions 4.2.0.Final through 4.2.17.Final contain an uncontrolled resource consumption vulnerability in the QPACK encoder-stream instruction decoder QpackEncoderHandler, installed on the peer-initiated unidirectional QPACK encoder stream, type 0x02...

CVE-2026-100662 Netty HTTP/3 QPACK encoder-stream unbounded memory exhaustion DoS

Netty's HTTP/3 codec io.netty:netty-codec-http3 versions 4.2.0.Final through 4.2.17.Final contain an uncontrolled resource consumption vulnerability in the QPACK encoder-stream instruction decoder QpackEncoderHandler, installed on the peer-initiated unidirectional QPACK encoder stream, type 0x02...

CVE-2026-100662 Netty HTTP/3 QPACK encoder-stream unbounded memory exhaustion DoS

Netty's HTTP/3 codec io.netty:netty-codec-http3 versions 4.2.0.Final through 4.2.17.Final contain an uncontrolled resource consumption vulnerability in the QPACK encoder-stream instruction decoder QpackEncoderHandler, installed on the peer-initiated unidirectional QPACK encoder stream, type 0x02...

EUVD-2026-87754

Netty's HTTP/3 codec io.netty:netty-codec-http3 from 4.2.0.Final through 4.2.17.Final retains unbounded per-stream QPACK encoder state. QpackEncoder stores a queue and a dynamic-table index tracker for every encoded field section that references the QPACK dynamic table, keyed by the peer-controll...

CVE-2026-100660

The Netty HTTP/3 codec (io.netty:netty-codec-http3) versions 4.2.0.Final through 4.2.17.Final are vulnerable to a denial of service (DoS) due to unbounded per-stream QPACK encoder state retention. The QpackEncoder stores a queue and a dynamic-table index tracker for every encoded field section re...

CVE-2026-100660: Allocation of Resources Without Limits or Throttling

Netty's HTTP/3 codec io.netty:netty-codec-http3 from 4.2.0.Final through 4.2.17.Final retains unbounded per-stream QPACK encoder state. QpackEncoder stores a queue and a dynamic-table index tracker for every encoded field section that references the QPACK dynamic table, keyed by the peer-controll...

BIT-NGINX-GATEWAY-2026-42530 NGINX Open-Source ngx_http_v3_module vulnerability

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...

CVE-2026-42530

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...

DEBIAN-CVE-2026-42530

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...

CVE-2026-42530

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...

CVE-2026-42530

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...

CVE-2026-42530

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...

EUVD-2026-37717

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...

CVE-2026-42530 NGINX Open-Source ngx_http_v3_module vulnerability

NGINX Open Source has a vulnerability in the ngxhttpv3module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This m...