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CVE-2026-115391 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers guest-specified-length writes on the host without limit. Malicious guests can offer large buffers to WASIp3 file or HTTP write streams, causing the host to copy and buffer all bytes, bounded only by guest linear memory, exhausting host memory.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:5.8 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-x84v-gj2h-g759	[email protected]	AdvisoryRemedyVendor
https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-46.0.3-and-47.0.0-before-47.0.4-unbounded-heap-allocation-via-wasip3-streams	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-770	Allocation of Resources Without Limits or Throttling	[email protected]

Affected Products

Product	Versions
bytecodealliance Wasmtime	>= 46.0.0, < 46.0.3 (semver) >= 47.0.0, < 47.0.4 (semver)
CPE cpe:2.3:a:bytecodealliance:wasmtime::::::rust::* Remediation Upgrade: 46.0.3moderate effort Upgrade: 47.0.4moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 4, 2026	CVE Modified	CISA-ADP
Oct 22, 2026	New CVE Received	[email protected]