UBUNTU-CVE-2026-115386

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

Linux Distros Unpatched Vulnerability : CVE-2026-115386

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation...

DEBIAN-CVE-2026-115386

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

CVE-2026-115386

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

CVE-2026-115386

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

CVE-2026-115386

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

CVE-2026-115386 Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Memory Disclosure via fd_readdir

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

CVE-2026-115386

The Wasmtime runtime contains an information disclosure vulnerability in the WASIp1 fd_readdir implementation affecting versions before 36.0.17 , 37.0.0 before 48.0.4 , and 49.0.0 before 49.0.2 . The root cause is the copying of uninitialized struct padding into guest memory. Consequently, guests...

CVE-2026-115386 Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Memory Disclosure via fd_readdir

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

CVE-2026-115386

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

CVE-2026-115386 Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 Memory Disclosure via fd_readdir

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

EUVD-2026-108314

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fdreaddir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

PT-2026-121564

Wasmtime before 36.0.17, 37.0.0 before 48.0.4, and 49.0.0 before 49.0.2 contains an information disclosure vulnerability in the WASIp1 fd readdir implementation that copies uninitialized struct padding into guest memory. Guests with a preopened directory can list entries to receive three bytes of...

Bytecode Alliance wasmtime resource management error vulnerability

The Bytecode Alliance WasmTime versions prior to 36.0.17, versions 37.0.0 prior to 48.0.4, and versions 49.0.0 prior to 49.0.2 contain a resource management error vulnerability. This vulnerability arises because the WASIp1 fdreaddir implementation copies uninitialized structs into client memory...

Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination

Summary Wasmtime's WASI filesystem implementation lets a guest with a read-only source file capability overwrite that file by hard-linking it into another preopen that allows file writes. An attacker who can run a WASI guest can bypass WasiCtxBuilder per-preopen FilePerms and modify host files th...

GHSA-4CH3-9J33-3PMJ Wasmtime: WASI hard links bypass wasmtime-wasi's FilePerms for destination

Summary Wasmtime's WASI filesystem implementation lets a guest with a read-only source file capability overwrite that file by hard-linking it into another preopen that allows file writes. An attacker who can run a WASI guest can bypass WasiCtxBuilder per-preopen FilePerms and modify host files th...

Wasmtime has a leak in WASIp1 `fd_renumber` implementation

Impact Wasmtime's native implementation of WASIp1 suffers from a leak in the fdrenumber function where the file descriptor being renumbered to is not properly closed. Wasmtime's implementation erroneously only updated the table of descriptors for WASIp1 and didn't update the underlying table of...

EUVD-2026-41136

Wasmtime has a leak in WASIp1 fdrenumber implementation...

GHSA-3P27-QVP9-27QF Wasmtime has a leak in WASIp1 `fd_renumber` implementation

Impact Wasmtime's native implementation of WASIp1 suffers from a leak in the fdrenumber function where the file descriptor being renumbered to is not properly closed. Wasmtime's implementation erroneously only updated the table of descriptors for WASIp1 and didn't update the underlying table of...

JLSEC-2026-1349 Wasmtime CLI is vulnerable to host panic through its fd_renumber function

Summary A bug in Wasmtime's implementation of the WASIp1 set of import functions can lead to a WebAssembly guest inducing a panic in the host embedder. The specific bug is triggered by calling pathopen after calling fdrenumber with either: - two equal argument values - second argument being equal...