CVE-2026-44453 h2o is vulnerable to musl libc stack overflow

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 6b5370d, h2o is vulnerable to a Denial of Service attack when calling alloca under certain conditions. When serving static files, h2o builds the file path on stack, by calling alloca. The maximum size of the memor...

CVE-2026-44453

The CVE-2026-44453 entry concerns the h2o HTTP server (HTTP/1.x, HTTP/2, HTTP/3). Before commit 6b5370d, h2o could trigger a Denial of Service by calling alloca to build file paths for static files, potentially allocating up to ~600 KB on the stack. This exceeds the musl libc pthread stack defaul...

CVE-2026-44453 h2o is vulnerable to musl libc stack overflow

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 6b5370d, h2o is vulnerable to a Denial of Service attack when calling alloca under certain conditions. When serving static files, h2o builds the file path on stack, by calling alloca. The maximum size of the memor...

CVE-2026-55213

CVE-2026-55213 (h2o HTTP server) – Affected component: lib/http3/qpack.c, invoked while processing a QPACK instruction over HTTP/3. Root cause: on-stack allocation of a large buffer (up to ~800 KB) via alloca, exceeding default musl libc pthread stack size, leading to a segmentation fault when to...

CVE-2026-55213 h2o: musl libc stack overflow (QPACK)

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1, when h2o processes a QPACK instruction sent from the peer over HTTP/3, lib/http3/qpack.c might allocate an on-stack buffer as large as approximately 800 KB by calling...

CVE-2026-55213 h2o: musl libc stack overflow (QPACK)

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit edd7a120bfc4af11ac0cbebce2a43cc1f93f9af1, when h2o processes a QPACK instruction sent from the peer over HTTP/3, lib/http3/qpack.c might allocate an on-stack buffer as large as approximately 800 KB by calling...

Microsoft Security Advisory CVE-2026-45591 – ASP.NET Core Denial of Service Vulnerability

Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core SignalR and Blazor Server. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A denial of service...

FreeBSD : h2o -- stack overflow serving static files on musl libc (644d5e6c-1bd9-4904-8440-16c04100a2e1)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 644d5e6c-1bd9-4904-8440-16c04100a2e1 advisory. h2o project reports: When serving static files, h2o can allocate a file path on the stack using alloca...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling. An attacker can exhaust system resources by sending specially crafted requests over the network, resulting in service unavailability for legitimate users. Remediation Upgrade...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling. An attacker can exhaust system resources by sending specially crafted requests over the network, resulting in service unavailability for legitimate users. Remediation Upgrade...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling. An attacker can exhaust system resources by sending specially crafted requests over the network, resulting in service unavailability for legitimate users. Remediation Upgrade...

Symlink Attack

Overview Affected versions of this package are vulnerable to Symlink Attack via improper link resolution before file access. An attacker can modify local files by exploiting symbolic links to redirect file operations to unintended locations. Remediation Upgrade...

Symlink Attack

Overview Affected versions of this package are vulnerable to Symlink Attack via improper link resolution before file access. An attacker can modify local files by exploiting symbolic links to redirect file operations to unintended locations. Remediation Upgrade...

h2o -- stack overflow serving static files on musl libc

h2o project reports: When serving static files, h2o can allocate a file path on the stack using alloca. On systems using musl libc, a large allocation can exceed the default pthread stack size and crash the server, causing a denial of service...

Astra Linux – Vulnerability in musl

In musl libc through 1.2.1, wcsnrtombs mishandles certain combinations of destination buffer size and source character limit, as demonstrated by an invalid write access buffer overflow...

Astra Linux – Vulnerability in musl

Musl libc versions 0.9.13 through 1.2.5 before 1.2.6 have a out-of-bounds write vulnerability, which means that an attacker can trigger the iconv conversion of untrusted EUC-KR text to UTF-8...

Astra Linux – Vulnerability in musl

The musl libc version up to 1.1.23 has an x87 floating-point stack adjustment imbalance, which is related to the math/i386/ directory. In some cases, using this library may lead to out-of-bounds writes, which are not present in an application’s source code...

Infinite loop

Overview Microsoft.AspNetCore.App.Runtime.linux-musl-arm is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to Infinite loop in the...

Infinite loop

Overview Microsoft.AspNetCore.App.Runtime.linux-musl-x64 is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to Infinite loop in the...

Infinite loop

Overview Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 is a package providing a default set of APIs for building an ASP.NET Core application. Contains assets used for self-contained deployments. Affected versions of this package are vulnerable to Infinite loop in the...