Operation on a Resource after Expiration or Release Affecting wasmtime-wasi package, versions <24.0.4>=33.0.0 <33.0.2>=34.0.0 <34.0.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-WASMTIMEWASI-10845565
- published20 Jul 2025
- disclosed18 Jul 2025
- creditUnknown
Introduced: 18 Jul 2025
NewCVE-2025-53901 (opens in a new tab)How to fix?
Upgrade wasmtime-wasi to version 24.0.4, 33.0.2, 34.0.2 or higher.
Overview
wasmtime-wasi is a Crate defining the Wasi type for Wasmtime, which represents a WASI instance which may be added to a linker.
Affected versions of this package are vulnerable to Operation on a Resource after Expiration or Release via the fd_renumber function in the preview1.rs file. An attacker can cause a panic in the host environment by invoking fd_renumber with either two identical arguments or with a second argument referencing a previously closed file descriptor, followed by a call to open a new file descriptor.
Note: This is only exploitable if the embedding provides a preopened directory to the guest, allowing the creation of additional file descriptors.