CVE & CISA-KEV Catalog

CVE-2026-115393

LOW
3.8
CVSS v3
NVD

Description

Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability because several Store APIs fail to validate that objects belong to the Store's Engine. Embedders mixing objects between Engines via Instance::new, StructRefPre::new, or Tag::new can trigger trampoline signature mismatches causing out-of-bounds stack writes, GC heap corruption, or panics.

CWE-787Out-of-bounds Write

How to fix

Remediation Available
rust-wasmtimeDebian
Fixed in:36.0.13+dfsg-1CVE-2026-115393
wasmtimecrates.io (Rust)
Fixed in:47.0.3RUSTSEC-2026-0222

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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 ComplexityHigh
Privileges RequiredHigh
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityLow
IntegrityLow
AvailabilityLow

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

Exploit Intelligence

0.09%probability of exploitation in 30 days
0thpercentile

Low risk: more likely to be exploited than 0% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2025-22457Critical9.0100%KEV + RansomFix
CVE-2025-0282Critical9.0100%KEV + Ransom-
CVE-2023-4863High8.8100%KEVFix
CVE-2021-20038Critical9.8100%KEV + Ransom-
CVE-2015-3113Critical9.8100%KEVFix
CVE-2008-2992High7.8100%KEV + Ransom-

Common questions

How do I fix CVE-2026-115393?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-115393 being actively exploited?

Not that we know of. CVE-2026-115393 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.09% is the estimated probability that it will be exploited in the next 30 days. That is higher than 0% of all scored CVEs.

How severe is CVE-2026-115393?

CVE-2026-115393 has a CVSS v3 base score of 3.8, rated low. 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-2026-115393 affect?

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

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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 2026-10-22.