Download Wasmtime 49.0.3

## 49.0.3

Released 2026-10-14.

### Fixed

• Out-of-bounds zero-length stream writes can panic.
[GHSA-93g3-36p8-x2gc](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-93g3-36p8-x2gc)

• Host panic when component `call_async` is cancelled under some conditions.
[GHSA-3r89-v5mq-j5xf](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-3r89-v5mq-j5xf)

• Panic on erroneous call-to-host from guest realloc call.
[GHSA-7v24-42x9-pxf7](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-7v24-42x9-pxf7)

• Yielding in a component start function can lead to a host panic.
[GHSA-5hhx-4wrr-3j9g](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-5hhx-4wrr-3j9g)

• Panic when invoking an async-lifted function via `call`.
[GHSA-m6w2-jwq2-cv2c](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m6w2-jwq2-cv2c)

• Panic when pending calls are run after a trap.
[GHSA-hmwq-g22x-qjw5](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hmwq-g22x-qjw5)

• Stack overflow dropping a long chain of recursive types.
[GHSA-wjc8-633q-pwxr](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-wjc8-633q-pwxr)

• Wasmtime may not properly enforce async-entrypoint requirement.
[GHSA-vcg5-q8m5-8379](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-vcg5-q8m5-8379)

• Panic viewing component model stream or future as the wrong type.
[GHSA-63h4-6cx9-pjfj](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-63h4-6cx9-pjfj)

• Component-model handle tables are capped only per instance and charged to no
limit.
[GHSA-q554-3cjc-rx7p](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-q554-3cjc-rx7p)

• Exception tags can cause host data structures to be unaligned.
[GHSA-p79w-pv2r-29qp](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p79w-pv2r-29qp)

• Filesystem sandbox escape when renaming symlinks with trailing slashes.
[GHSA-m9f7-9w4p-gv38](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-m9f7-9w4p-gv38)

• Overlapping string transcode in a fused adapter can panic.
[GHSA-54p9-vhhq-8f7q](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-54p9-vhhq-8f7q)

• Guests can send absolute-form HTTP requests to different hosts.
[GHSA-5qpp-g3j2-8frx](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-5qpp-g3j2-8frx)

• `wasi-http`：Request with long url before query parameter crashes host.
[GHSA-w36r-2hch-9xp9](https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-w36r-2hch-9xp9)