# CVE-2025-53901: RUSTSEC-2025-0046 - Host panic with `fd_renumber` WASIp1 function

Source: https://junglewise.ai/threats/cve-2025-53901-wasmtime-cli-is-vulnerable-to-host-panic-through-its-fd-renumber  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-07-18  
License: CC BY 4.0 with a link back

CVE-2025-53901 · Severity: low · CVSS 3.1 · Published 2025-07-18

Host panic with `fd_renumber` WASIp1 function

Technologies: [wasmtime (crates.io)](https://junglewise.ai/threats/technologies/wasmtime), [wasmtime-wasi (crates.io)](https://junglewise.ai/threats/technologies/wasmtime-wasi). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is CVE-2025-53901 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-53901 being exploited in the wild.

**How severe is CVE-2025-53901?** Low severity, with a CVSS score of 3.1, published 18 July 2025.

**Which products and versions are affected?** wasmtime (crates.io) SEMVER:introduced=10.0.0,fixed=24.0.4, SEMVER:introduced=10.0.0,fixed=24.0.4,introduced=25.0.0,fixed=33.0.2,introduced=34.0.0,fixed=34.0.2; wasmtime-wasi (crates.io) SEMVER:introduced=0,fixed=24.0.4.

**Is there a fix for CVE-2025-53901?** Yes. wasmtime (crates.io): upgrade to 24.0.4, 34.0.2 or later; wasmtime-wasi (crates.io): upgrade to 24.0.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2025-53901?** Check whether you run wasmtime (crates.io) or wasmtime-wasi (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- wasmtime (crates.io): upgrade to 24.0.4, 34.0.2 or later

  ```sh
  cargo update -p wasmtime
  ```

- wasmtime-wasi (crates.io): upgrade to 24.0.4 or later

  ```sh
  cargo update -p wasmtime-wasi
  ```


## Affected products

- wasmtime (crates.io) SEMVER:introduced=10.0.0,fixed=24.0.4, SEMVER:introduced=10.0.0,fixed=24.0.4,introduced=25.0.0,fixed=33.0.2,introduced=34.0.0,fixed=34.0.2
- wasmtime-wasi (crates.io) SEMVER:introduced=0,fixed=24.0.4

## Identifiers

- CVE-2025-53901
- GHSA-fm79-3f68-h2fc
- RUSTSEC-2025-0046

## Related threats

- [RUSTSEC-2026-0422 - Typed functions with `i31` or `nullref` arguments may panic due to insufficient type-check](https://junglewise.ai/threats/rustsec-2026-0422-typed-functions-with-i31-or-nullref-arguments-may-0545dc2b)
- [Wasmtime type confusion with host-created struct types](https://junglewise.ai/threats/rustsec-2026-0423-cross-engine-type-confusion-with-host-created-struct-89fe3f0e)
- [Wasmtime unchecked memory usage in borrowed resource transfer](https://junglewise.ai/threats/rustsec-2026-0424-unchecked-memory-usage-in-transferring-borrowed-b297503c)
- [RUSTSEC-2026-0420 - wasip3 UDP `send` can deliver a datagram to an address only allowed for receiving](https://junglewise.ai/threats/rustsec-2026-0420-wasip3-udp-send-can-deliver-a-datagram-to-an-address-cfc65c09)
- [Wasmtime Cranelift aarch64 br_table sandbox escape](https://junglewise.ai/threats/cve-2026-115893-wasmtime-is-a-runtime-for-webassembly-prior-to-36-0-19-48-0-7)