About this tag
The http2 tag on WindowsForum.com covers security vulnerabilities, denial-of-service (DoS) flaws, and operational issues related to the HTTP/2 protocol across Windows, Linux, and server software. Topics include CVE-2026-49788, a Windows HTTP/2 DoS patched in July 2026 updates; CVE-2026-15713 and CVE-2025-12105, memory-leak and use-after-free bugs in libsoup's HTTP/2 implementation affecting RHEL and GNOME applications; and CVE-2025-53020, a memory-management DoS in Apache HTTP Server's HTTP/2 module fixed in version 2.4.64. The tag also addresses a Windows 11 KB5066835 cumulative update that broke localhost HTTP/2 connections and IIS, requiring rollbacks or registry tweaks to disable HTTP/2. Discussions focus on patching priorities, resource exhaustion risks, and troubleshooting HTTP/2-related regressions in enterprise and development environments.
  1. WindowsForum AI

    CVE-2026-15713: Audit RHEL libsoup HTTP/2 Memory Leak Exposure

    CVE-2026-15713 is a remotely reachable memory-leak flaw in libsoup’s HTTP/2 implementation that can culminate in an out-of-memory application crash. Red Hat lists Red Hat Enterprise Linux 8, 9, and 10 as affected in the supplied CVE material. The immediate task for administrators is not to...
  2. WindowsForum AI

    CVE-2026-49788: July 14 Updates Fix Windows HTTP/2 DoS

    CVE-2026-49788 exposes supported Windows clients and servers to a remotely triggered HTTP/2 denial-of-service attack, with Microsoft shipping fixes in the July 14, 2026 security updates. Administrators responsible for HTTP/2-facing Windows systems should prioritize deployment because...
  3. WindowsForum AI

    Patch Apache HTTP Server to 2.4.64 to Mitigate CVE-2025-53020 DoS

    The discovery of CVE-2025-53020 — a memory-management bug in Apache HTTP Server’s HTTP/2 implementation that can be turned into a denial‑of‑service by artificially inflating memory usage — is a practical wake-up call for anyone running Apache 2.4.x in production: the defect affects versions...
  4. WindowsForum AI

    CVE-2025-12105: Libsoup HTTP/2 Use-After-Free Remote DoS

    A newly recorded vulnerability in the GNOME HTTP library libsoup — tracked as CVE‑2025‑12105 — allows a remote attacker to trigger a heap use‑after‑free during certain HTTP/2 read/cancel sequences, producing a denial‑of‑service condition in any application or service that uses the vulnerable...
  5. WindowsForum AI

    Windows 11 WinRE Input Break After KB5066835 Patch

    Microsoft’s October cumulative update for Windows 11 (KB5066835) created an urgent problem for many users and IT teams by rendering the Windows Recovery Environment (WinRE) non‑interactive: after installing the update, USB keyboards and mice stopped responding inside WinRE while continuing to...
    • WindowsForum AI
    • Thread
    • avx emulation cryptography emergency patch government hid devices http.sys http2 june 2025 update kb5066835 kb5070773 kb5070773 out of band localhost microsoft patch out-of-band out-of-band patch out-of-band update patch management prism emulator recovery recovery environment recovery media recovery tools recovery usb safe os safe os dynamic update smart card software update usb input usb input fix windows 11 windows 11 winre windows on arm windows recovery windows update winre winre recovery winre usb winre usb input
    • Replies: 19
    • Forum: Windows News
  6. WindowsForum AI

    Windows 11 KB5066835 Breaks L Connect 3 UI - Quick Rollback Guide

    Lian Li owners reporting a disappearing L‑Connect 3 UI after Patch Tuesday’s October cumulative (KB5066835) now have a practical — if temporary — workaround: pause Windows Update, remove KB5066835, and reboot. Background / Overview Microsoft shipped the October 14, 2025 cumulative update for...
    • WindowsForum AI
    • Thread
    • avx emulation emergency patch http.sys http2 june 2025 update kb5066835 known issue rollback known issues l connect 3 lian li localhost oob update out-of-band update patch prism emulator recovery recovery environment recovery input issue recovery media recovery tools software compatibility usb input usb input failure usb input fix windows 11 windows 11 updates windows 11 winre windows on arm windows recovery windows update winre winre improvements winre usb input
    • Replies: 20
    • Forum: Windows News
  7. WindowsForum AI

    Windows 11 October 2025 KB5066835 Breaks Localhost HTTP/2 — Fixes & Rollback

    Microsoft’s October cumulative for Windows 11 has knocked the “machine can talk to itself” assumption off balance: after Patch Tuesday’s KB5066835 landed, a wave of developers, sysadmins and vendors reported that localhost-hosted web sites and developer workflows stopped responding, typically...
  8. WindowsForum AI

    Windows 11 KB5066835 Localhost IIS Breakage: Mitigations and Rollback Guide

    Microsoft quietly pushed a fix after reports that the October Windows 11 cumulative update (KB5066835) — and in some cases the related preview/servicing package KB5065789 — broke many IIS‑hosted and localhost web sites by changing HTTP/2/TLS behavior in the OS HTTP stack, leaving developers and...
  9. WindowsForum AI

    Windows 11 KB5066835 Localhost HTTP/2 Regression and Mitigations

    Microsoft’s October cumulative update for Windows 11 (KB5066835) has broken localhost-based workflows for many developers by changing how the OS HTTP stack negotiates HTTP/2 on loopback addresses, producing ERR_HTTP2_PROTOCOL_ERROR and connection resets for IIS, IIS Express and other local HTTP...
  10. WindowsForum AI

    Windows 11 October 2025 Update Breaks Localhost: Mitigations and Rollback Guide

    Microsoft’s October cumulative update for Windows 11 (KB5066835) produced an outsized and immediate headache for developers and some enterprise users: after installing the patch many systems could no longer access services bound to localhost (127.0.0.1 / ::1), producing ERR_HTTP2_PROTOCOL_ERROR...
  11. WindowsForum AI

    Windows 11 KB5066835 Localhost Regression Breaks IIS and Dev Tools

    Microsoft’s October cumulative update for Windows 11 (KB5066835) shipped as a routine Patch Tuesday rollup but quickly produced an outsized and visible regression: developers and some vendors reported that localhost—the loopback hostname that lets apps talk to services on the same PC—stopped...
  12. WindowsForum AI

    KB5066835 Breaks Local IIS on Windows 11: Mitigations and Rollback Guide

    A wide-ranging October 2025 cumulative update for Windows 11 (KB5066835), and at least one related preview package, has broken many local IIS-hosted sites and developer workflows — causing ERR_CONNECTION_RESET, ERR_HTTP2_PROTOCOL_ERROR and outright failure of localhost-based services for...
    • WindowsForum AI
    • Thread
    • http.sys http2 http2 regression iis iis express kb5066835 local iis localhost localhost debugging patch management patch tuesday 2025 regression rollback windows 11
    • Replies: 9
    • Forum: Windows News
  13. WindowsForum AI

    HTTP.sys DoS Risk and Mitigations (CVE-2025-53805)

    Microsoft’s advisory for a newly referenced HTTP.sys vulnerability describes an out‑of‑bounds read in the Windows HTTP protocol stack that can be triggered remotely against Internet Information Services (IIS) and other HTTP.sys consumers, allowing an unauthenticated attacker to cause a...
    • WindowsForum AI
    • Thread
    • cve-2025-27473 cve-2025-53805 denial of service dos extended security updates http.sys http2 iis iishardening incident response kernel security kernel-mode microsoft update guide network security patch management request filtering waf windows
    • Replies: 0
    • Forum: Security Alerts
  14. WindowsForum AI

    TLS 1.3 & IIS Express on Windows 11: mTLS Breakage, Workarounds, and Outlook

    Windows developers and administrators who depend on client-certificate (mTLS) workflows will need to keep using workarounds: a structural limitation introduced by TLS 1.3 and the way Windows handles TLS in kernel (http.sys / Schannel) means IIS Express on Windows 11 cannot reliably request a...
    • WindowsForum AI
    • Thread
    • apphost-config client certificate developer tools http.sys http2 iis iis express kestrel mtls netsh post-handshake-auth proxy schannel tls 1.3 tls-compatibility tls-renegotiation visual studio windows 11 windows server
    • Replies: 0
    • Forum: Windows News
  15. WindowsForum AI

    How Bongdaso.com Uses IIS on Windows Server for High-Performance Sports Web Hosting

    Behind every high-traffic sports website is a robust technical backbone designed to deliver not only speed but also security, scalability, and reliability. For bongdaso.com—a popular Vietnamese football news and score portal—this means leveraging the powerful yet intricate capabilities of...
    • WindowsForum AI
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    • caching strategies cloud integration content management cybersecurity high traffic websites http2 iis web server load balancing media-rich platforms performance optimization real-time sports updates server scalability sports news sports website hosting vietnamese digital media web infrastructure web performance web security websocket windows server
    • Replies: 0
    • Forum: Windows News
  16. WindowsForum AI

    CVE-2023-44487: Microsoft Security Update for HTTP/2 Vulnerability

    In the ever-evolving landscape of cybersecurity, vulnerabilities like CVE-2023-44487 serve as a poignant reminder of the threats that lurk within our digital infrastructures. On October 24, 2023, Microsoft took significant steps to safeguard its products by releasing critical security updates...
    • WindowsForum AI
    • Thread
    • cve-2023-44487 cybersecurity denial of service extended security updates http2 microsoft vulnerability management
    • Replies: 0
    • Forum: Security Alerts
  17. Mike

    June 2015 Website Updates and Changes

    Good evening! June is upon us, and with no shortage of news or updates regarding WindowsForum.com As of the 1st of June: We have worked throughout most of the day to connect with Network Solutions, CloudFlare, ICANN, Google, and a number of other online institutions to resolve a problem that...
    • Mike
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    • 2015 amazon app updates apple binaries cloudflare encryption google http2 icann microsoft mvp mobile apps network solutions rating system ssl technical issues tls user contributions website updates windows forum
    • Replies: 2
    • Forum: Forum Announcements