GHSA-6HR6-W5QG-QMWG h2: Duplicate Host header could facilitate request smuggling

Impact h2 =4.4.0 accepts request header blocks containing more than one Host header, and forwards every Host header to the consuming application. Where the consumer downgrades HTTP/2 to HTTP/1.1, the resulting request carries two Host header lines, which is a request smuggling primitive CWE-444...

CVE-2026-56846

A flaw was found in Node.js's handling of HTTP/2. This vulnerability allows a remote attacker to bypass maxSessionMemory limits by sending specially crafted HTTP/2 retained header blocks. This can lead to memory exhaustion, resulting in a denial of service DoS for the affected system. Mitigation ...

axios: axios: Denial of Service due to maxBodyLength bypass in HTTP/2 requests

A flaw was found in axios, a popular JavaScript library for making HTTP requests. When using the Node.js HTTP/2 adapter, axios fails to properly enforce the configured maxBodyLength limit for streamed request bodies. This allows a remote attacker, by controlling the input stream, to send an...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the HTTP/2 header block handling. An attacker can cause excessive memory consumption by sending specially crafted HTTP/2 requests that bypass memory limits. Remediation A fix was...

EUVD-2026-52564

A flaw in Node.js HTTP/2 handling can cause HTTP/2 retained header blocks evade maxSessionMemory and enable remote memory exhaustion. This vulnerability affects Node.js 24.x and 22.x...

CVE-2026-56846

Node.js HTTP/2 handling flaw (CVE-2026-56846) affects Node.js 24.x and 22.x. The issue allows HTTP/2 retained header blocks to evade maxSessionMemory, enabling remote memory exhaustion. Exploitation details are not provided in the documents. Remediation follows the vendor advisory: apply the July...

CVE-2026-67318

axios versions =1.13.0 Node.js HTTP adapter fail to enforce the configured maxBodyLength limit on streamed request bodies when requests are sent with httpVersion: 2. Because Node's HTTP/2 request API does not honor the maxBodyLength option and axios's byte-counting stream wrapper is gated on...

UBUNTU-CVE-2026-67318

axios versions =1.13.0 Node.js HTTP adapter fail to enforce the configured maxBodyLength limit on streamed request bodies when requests are sent with httpVersion: 2. Because Node's HTTP/2 request API does not honor the maxBodyLength option and axios's byte-counting stream wrapper is gated on...

CVE-2026-67318

axios versions =1.13.0 Node.js HTTP adapter fail to enforce the configured maxBodyLength limit on streamed request bodies when requests are sent with httpVersion: 2. Because Node's HTTP/2 request API does not honor the maxBodyLength option and axios's byte-counting stream wrapper is gated on...

CVE-2026-67318 axios 1.13.0 before 1.18.0 maxBodyLength Bypass via HTTP/2

axios versions =1.13.0 Node.js HTTP adapter fail to enforce the configured maxBodyLength limit on streamed request bodies when requests are sent with httpVersion: 2. Because Node's HTTP/2 request API does not honor the maxBodyLength option and axios's byte-counting stream wrapper is gated on...

CVE-2026-64785

A flaw was found in SwiftNIO HTTP/2. This vulnerability allows a remote attacker to perform HTTP request smuggling or response splitting. The issue stems from insufficient validation of incoming HTTP/2 HEADERS frames, which are parts of an HTTP/2 request. This allows special control characters,...

nodejs: Node.js: Remote memory exhaustion via HTTP/2 retained header blocks

A flaw was found in Node.js's handling of HTTP/2. This vulnerability allows a remote attacker to bypass maxSessionMemory limits by sending specially crafted HTTP/2 retained header blocks. This can lead to memory exhaustion, resulting in a denial of service DoS for the affected system...

UBUNTU-CVE-2026-65325

Apache Traffic Server reuses multiplexed HTTP/2 origin connections without verifying the server certificate covers the new request hostname. This issue affects Apache Traffic Server: from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1....

CVE-2026-58153

Apache Traffic Server forwards HTTP/2 origin trailers to HTTP/1 clients without proper chunked framing when converting HTTP/2 to HTTP/1. This issue affects Apache Traffic Server: from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue...

CVE-2026-58153

Apache Traffic Server forwards HTTP/2 origin trailers to HTTP/1 clients without proper chunked framing when converting HTTP/2 to HTTP/1. This issue affects Apache Traffic Server: from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue...

CVE-2026-58150

Apache Traffic Server does not reject Transfer-Encoding in HTTP/2 requests, allowing downgrade request smuggling. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4...

CVE-2026-58150

Apache Traffic Server does not reject Transfer-Encoding in HTTP/2 requests, allowing downgrade request smuggling. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4...

CVE-2026-58150 Apache Traffic Server: HTTP/2 requests with Transfer-Encoding are not rejected, allowing request smuggling

Apache Traffic Server does not reject Transfer-Encoding in HTTP/2 requests, allowing downgrade request smuggling. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4...

PT-2026-65728

Apache Traffic Server can be crashed or driven to resource exhaustion by abusive HTTP/2 framing and flow-control. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2.15 or 10.1.4...

EUVD-2026-49739

Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP/2 or HTTP/3 peer to exhaust memory on the vulnerable server or client and cause a denial of service. The HPACK and QPACK prefixed-integer decoder cowhpackcommon:decbigint/3 in...