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CVE-2026-115389Published

Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAsse…

Exact source revision recorded 25 Oct 2026 05:17:18 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

nvd · CVE-2026-115389

Published

Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.

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: Deferred

Weakness classifications: CWE-770

Original publisher date fields

published: 2026-10-22T19:17:46.330

lastModified: 2026-10-22T19:17:46.453

Source published
22 Oct 2026 19:17:46 UTC
Source modified
22 Oct 2026 19:17:46 UTC
Observed here
25 Oct 2026 05:17:18 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 4.0 · [email protected] · Secondary · 1.0 CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS 3.1 · [email protected] · Primary · 2.3 CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L

ChangeIntel

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Sources read 26 Oct 04:30 UTC · 271 of 271 readable · 269 fully read · documentation 464/464 current

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