AI-Assisted HTTP Terminator Finds Novel HTTP Desync Techniques and Apache Zero-Day

PortSwigger says HTTP Terminator, an artificial intelligence AI-assisted research system built by James Kettle , generated and proved new HTTP desynchronization techniques after exploring 30,000 candidate desync vectors. PortSwigger said a separate human-guided discovery cascade also exposed a...

OESA-2026-3268 libevent security update

Libevent additionally provides a sophisticated framework for buffered network IO, with support for sockets, filters, rate-limiting, SSL, zero-copy file transmission, and IOCP. Libevent includes support for several useful protocols, including DNS, HTTP, and a minimal RPC framewor. Security Fixes:...

CVE-2026-71554 h2: Duplicate Host header could facilitate request smuggling

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host header, and forward every Host header to the consuming application. Where the consumer downgrades HTTP/2 to HTTP/1.1, the resulting request...

thunderbird security update

An update is available for thunderbird. This update affects Rocky Linux 10. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list Mozilla Thunderbird is a standalone mail and newsgroup client. Security...

firefox: thunderbird: Site isolation issue in the Networking: HTTP component

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Site isolation issue in the Networking: HTTP component...

CVE-2026-58047

HTTP Smuggling in cPanel allows potential leak of credentials...

CVE-2026-59899

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, HttpContentEncoder the superclass of the production handler HttpContentCompressor maintains a per-channel ArrayDeque named acceptEncodingQueue that accumulates attacker-controll...

CVE-2026-65325 Apache Traffic Server: HTTP/2 multiplexed origin sessions are reused without certificate re-verification

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-2026-58150

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...

CVE-2026-15325 IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities

IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty is vulnerable to HTTP request smuggling due to improper handling of TRACE requests...

CVE-2026-15328

CVE-2026-15328 affects IBM WebSphere Application Server 9.0, IBM WebSphere Application Server 8.5, and IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.7. The issue is described as an HTTP request smuggling vulnerability due to inconsistent interpretation of HTTP requests. Affecte...

CVE-2026-67182

Rouille 0.3.3 through 3.6.2 is affected by an HTTP request smuggling vulnerability. An attacker can inject bare line feed characters (0x0A) into client-supplied header values, which are copied verbatim to upstream connections without validation. A crafted header value can contain a complete addit...

CVE-2026-59248

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...

EEF-CVE-2026-65624 Cowboy HTTP/1.1 max_headers Bypass via Duplicate Header Names Enables Memory Exhaustion

Summary Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1. The HTTP/1.1 handler in cowboy\http enforces the max\headers limit by counting the number of distinct header...

PT-2026-65517

Name of the Vulnerable Software and Affected Versions Rouille versions 0.4.0 through 3.6.2 Description An HTTP response splitting issue exists where remote attackers can inject arbitrary response headers by embedding carriage return 0x0D or line feed 0x0A bytes into input they control. This can...

VulnCheck KEV: CVE-2025-68686

An Exposure of Sensitive Information to an Unauthorized Actor vulnerability CWE-200 vulnerability in Fortinet FortiOS 7.6.0 through 7.6.1, FortiOS 7.4.0 through 7.4.6, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions may allow a remote unauthenticated attacker to bypas...

CVE-2026-44909

CVE-2026-44909 – Normal mode Proxygen’s HTTP/2 flow-control handling in the core HTTP session layer lacks a generalized slow-consumer detection mechanism. A remote unauthenticated attacker can exploit HTTP/2 flow-control by setting SETTINGS_INITIAL_WINDOW_SIZE to 0 or by withholding WINDOW_UPDATE...

NPM: n8n: Shared Credential Header Leak via HTTP Request Pagination Expression

NPM: n8n: Shared Credential Header Leak via HTTP Request Pagination Expression vulnerability discovered by ? in WordPress Npm n8n versions 1.123.61...

GHSA-Q4F6-JM68-57WW Netty: [HttpContentEncoder] Unbounded Per-Connection Queue Growth via HTTP/1.1 Pipelining Leads to Denial of Service

Impact HttpContentEncoder the superclass of the production handler HttpContentCompressor maintains a per-channel ArrayDeque named acceptEncodingQueue that accumulates attacker-controlled data without any size limit. The queue is filled on the I/O thread for every inbound HTTP request and drained...