CVE-2026-58494

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (5th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 8, 2026

Last Modified

July 10, 2026

Advisory Details (9)

Auto-updated Jul 8, 2026
Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

Release v46.0.1 (bytecodealliance/wasmtime)

Patch available: bytecodealliance/wasmtime v46.0.1

https://github.com/bytecodealliance/wasmtime/releases/tag/v46.0.1
github_release Patch Available

Release v45.0.3 (bytecodealliance/wasmtime)

Patch available: bytecodealliance/wasmtime v45.0.3

https://github.com/bytecodealliance/wasmtime/releases/tag/v45.0.3
github_release Patch Available

Release v36.0.12 (bytecodealliance/wasmtime)

Patch available: bytecodealliance/wasmtime v36.0.12

https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.12
github_release Patch Available

Release v24.0.11 (bytecodealliance/wasmtime)

Patch available: bytecodealliance/wasmtime v24.0.11

https://github.com/bytecodealliance/wasmtime/releases/tag/v24.0.11
github_commit

commit d3ceb56ec35f (bytecodealliance/wasmtime)

Fix landed in bytecodealliance/wasmtime commit d3ceb56ec35f — awaiting tagged release

https://github.com/bytecodealliance/wasmtime/commit/d3ceb56ec35f39e02496eeb4e2d9c7f4fb964d9e
github_commit

commit 8a250aac0962 (bytecodealliance/wasmtime)

Fix landed in bytecodealliance/wasmtime commit 8a250aac0962 — awaiting tagged release

https://github.com/bytecodealliance/wasmtime/commit/8a250aac0962ca1364b5f16525720e9d0b39edcd
github_commit

commit 7db94cdcf0c7 (bytecodealliance/wasmtime)

Fix landed in bytecodealliance/wasmtime commit 7db94cdcf0c7 — awaiting tagged release

https://github.com/bytecodealliance/wasmtime/commit/7db94cdcf0c79cb3dfde884b534b653f2dd83367
github_commit

commit 5ddfd5f1ef28 (bytecodealliance/wasmtime)

Fix landed in bytecodealliance/wasmtime commit 5ddfd5f1ef28 — awaiting tagged release

https://github.com/bytecodealliance/wasmtime/commit/5ddfd5f1ef28f2041fa07d237ad0336e167b0e0c
githubMentions a patch (unverified)

WASI hard links and renames bypass wasmtime-wasi's FilePerms for destination · Advisory · bytecodealliance/wasmtime · GitHub

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4ch3-9j33-3pmj

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrust-main-1.97.0-1.1.hum12026-07-11redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
crates.io(1)
PackageVulnerable rangeFix by version rangeDependents
wasmtime-wasi—
  • 0.0.0-0 up to 24.0.11: fixed in 24.0.11
  • 25.0.0 up to 36.0.12: fixed in 36.0.12
  • 37.0.0 up to 45.0.3: fixed in 45.0.3
  • 46.0.0 up to 46.0.1: fixed in 46.0.1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
rust-wasmtime26.0.1+dfsg-10 ... 36.0.9+dfsg-2 (43 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
rust-wasmtime26.0.1+dfsg-10 ... 36.0.9+dfsg-2 (39 versions)
  • every version up to 36.0.12+dfsg-1: fixed in 36.0.12+dfsg-1
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 128 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
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  1. 2026-09-16 14:08 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-58494?
CVE-2026-58494 is a medium vulnerability published on July 8, 2026. 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…
When was CVE-2026-58494 disclosed?
CVE-2026-58494 was first published on July 8, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58494 actively exploited?
CVE-2026-58494 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58494?
CVE-2026-58494 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-58494?
A fix for CVE-2026-58494 is available: update to the fixed version the vendor names in its advisory.

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