CVE-2026-27204Wasmtime is a runtime for WebAssembly.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of WASI host interfaces are susceptible to guest-controlled resource exhaustion on the host. Wasmtime did not appropriately place limits on resource allocations requested by the guests. This serves as a Denial of Service vector. Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 have all been released with the fix for this issue. These versions do not prevent this issue in their default configuration to avoid breaking preexisting behaviors. All versions of Wasmtime have appropriate knobs to prevent this behavior, and Wasmtime 42.0.0-and-later will have these knobs tuned by default to prevent this issue from happening. There are no known workarounds for this issue without upgrading. Embedders are recommended to upgrade and configure their embeddings as necessary to prevent possibly-malicious guests from triggering this issue.
- CVSS
- 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400, CWE-770, CWE-774, CWE-789
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
bytecodealliance wasmtime bytecodealliance:wasmtime | before 24.0.6; from 25.0.0 before 36.0.6; from 37.0.0 before 40.0.4; from 41.0.0 before 41.0.4 | NVD |
References
- https://docs.rs/wasmtime-wasi/latest/wasmtime_wasi/struct.WasiCtxBuilder.html#method.max_random_sizeproduct
- https://docs.rs/wasmtime/latest/wasmtime/component/struct.ResourceTable.html#method.set_max_capacityproduct
- https://docs.rs/wasmtime/latest/wasmtime/struct.Store.html#method.set_hostcall_fuelproduct
- https://docs.wasmtime.dev/security-what-is-considered-a-security-vulnerability.htmlproduct
- https://github.com/bytecodealliance/wasmtime/issues/11552issue-tracking
- https://github.com/bytecodealliance/wasmtime/pull/12599issue-tracking, third-party-advisory
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-852m-cvvp-9p4wthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.