CVE-2026-58494

MEDIUM

6.5

CVSS v3

Description

Wasmtime is a runtime for WebAssembly. Prior to 24.0.11, 36.0.12, 45.0.3, and 46.0.1, wasmtime-wasi hard-link creation and renaming check directory permissions but not matching FilePerms on source and destination preopens, allowing a WASI guest with a read-only source file capability to overwrite host files exposed as FilePerms::READ through wasip1, wasip2, or wasip3 filesystem interfaces. This issue is fixed in versions 24.0.11, 36.0.12, 45.0.3, and 46.0.1.

CWE-281 CWE-863Incorrect Authorization

How to fix

Remediation Available

rust-wasmtimeDebian

Fixed in:36.0.12+dfsg-1CVE-2026-58494

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

Exploit Intelligence

0.17%probability of exploitation in 30 days

7thpercentile

Low risk: more likely to be exploited than 7% of all known CVEs.

References

Other references9

Related Vulnerabilities

Other CWE-281 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-8543	Critical	9.8	74%	KEV	-
CVE-2019-0233	High	7.5	68%	-	-
CVE-2017-8589	Critical	9.8	24%	-	-
CVE-2021-33990	Critical	9.8	12%	-	-
CVE-2017-8578	High	7.8	6.3%	-	-
CVE-2017-8563	High	8.1	5.9%	-	-

Common questions

How do I fix CVE-2026-58494?

Upgrade rust-wasmtime on debian unstable to 36.0.12+dfsg-1 or later.

Is CVE-2026-58494 being actively exploited?

Not that we know of. CVE-2026-58494 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.17% is the estimated probability that it will be exploited in the next 30 days. That is higher than 7% of all scored CVEs.

How severe is CVE-2026-58494?

CVE-2026-58494 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-58494 affect?

Published advisories record a fix for rust-wasmtime (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-58494

Markdown

[![CVE-2026-58494](https://tridentstack.com/cve/badge/CVE-2026-58494.svg)](https://tridentstack.com/cve/CVE-2026-58494)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-58494"><img src="https://tridentstack.com/cve/badge/CVE-2026-58494.svg" alt="CVE-2026-58494"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it works Start freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-10.