CVE-2024-30266Published

Wasmtime vulnerable to panic when using a dropped extenref-typed element segment

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2024-30266

Published

wasmtime is a runtime for WebAssembly. The 19.0.0 release of Wasmtime contains a regression introduced during its development which can lead to a guest WebAssembly module causing a panic in the host runtime. A valid WebAssembly module, when executed at runtime, may cause this panic. This vulnerability has been patched in version 19.0.1.

Source published: 4 Apr 2024 15:42:00 UTC
Source modified: 2 Aug 2024 01:32:07 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

euvd · EUVD-2024-1137

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Apr 4, 2024, 3:42:00 PM

dateUpdated: Aug 2, 2024, 1:32:07 AM

Source published: Apr 4, 2024, 3:42:00 PM (timezone not stated)
Source modified: Aug 2, 2024, 1:32:07 AM (timezone not stated)
Observed here: 9 Nov 2026 05:03:01 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

nvd · CVE-2024-30266

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-843

Original publisher date fields

published: 2024-04-04T16:15:09.107

lastModified: 2026-06-17T07:26:38.300

1 source CPE criteria · context only

cpe:2.3:a:bytecodealliance:wasmtime:19.0.0:*:*:*:*:rust:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 4 Apr 2024 16:15:09 UTC
Source modified: 17 Jun 2026 07:26:38 UTC
Observed here: 24 Oct 2026 23:17:34 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS 3.1 · [email protected] · Primary · 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv · GHSA-75hq-h6g9-h4q5

Published

### Impact The 19.0.0 release of Wasmtime contains a regression introduced during its development which can lead to a guest WebAssembly module causing a panic in the host runtime. A valid WebAssembly module, when executed at runtime, may cause this panic. The panic in question is caused when a WebAssembly module issues a `table.*` instruction which uses a dropped element segment with a table that also has an `externref` type. This causes Wasmtime to erroneously use an empty function segment instead of an empty externref segment to perform this operation. This mismatch in types causes a panic in Wasmtime when it's asserted that an externref table is only viewed as externrefs. This regression was introduced during the development of the 19.0.0 release and only affects the 19.0.0 release. This panic requires the `reference-types` WebAssembly feature to be enabled, and it is enabled by default. Toolchains are not known to generate this pattern by default so it's likely a module would need to be specifically crafted to trigger this panic. A panic in a host runtime represents a possible denial-of-service in some scenarios. This panic cannot introduce memory unsafety or allow WebAssembly to break outside of its sandbox, however. There is no possible heap corruption or memory unsafety from this panic. ### Patches Wasmtime 19.0.1 has been released to fix this problem. Users of 19.0.0 should upgrade to 19.0.1. All other versions of Wasmtime are not affected by this issue. ### Workarounds If upgrading is not possible it's recommended to use `config.reference_types(false)`. That will disable these modules at validation-time which prevents the possibility of a panic at runtime. If reference-types are required, however, then there is no other workaround at this time other than upgrading. ### References * [Original bug report](https://github.com/bytecodealliance/wasmtime/issues/8281) * [PR to fix the bug](https://github.com/bytecodealliance/wasmtime/pull/8283) * [PR that introduced the bug](https://github.com/bytecodealliance/wasmtime/pull/8018)

Source published: 2 Apr 2024 21:09:23 UTC
Source modified: 10 Sep 2026 03:50:12 UTC
Observed here: 24 Oct 2026 13:19:54 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Publisher rating · LOW

osv · RUSTSEC-2024-0441

Published

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-75hq-h6g9-h4q5. For more information see the GitHub-hosted security advisory.

Source published: 2 Apr 2024 12:00:00 UTC
Source modified: 12 Oct 2026 18:00:07 UTC
Observed here: 24 Oct 2026 13:19:54 UTC
Source terms: OSV · upstream source license applies

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L