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CVE-2026-115393

LOW 1

Published 2026-10-22 · Last modified 2026-10-22

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.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.1%chance of exploitation in 30 days · 0th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

1CVSS 4.0 · LOW

  • ConfidentialityLow
  • IntegrityLow
  • AvailabilityLow

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ⚠Privileges: Requires an admin / high-privilege account
  • ⚠User interaction: Succeeds with passive user activity
  • ⚠Complexity: Needs a race window or specific setup
  • ⚠Requirements: Specific conditions must be present

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Bytecodealliance

Products Wasmtime

Weakness (CWE)

  • CWE-787: Out-of-bounds Write

CVSS vector

CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • wasmtime crates.io

    pkg:cargo/wasmtime

    SEMVER range
    • Introduced version (included): 0.0.0-0
    • Fixed boundary (excluded): 24.0.12
    • Introduced version (included): 25.0.0
    • Fixed boundary (excluded): 36.0.13
    • Introduced version (included): 37.0.0
    • Fixed boundary (excluded): 46.0.2
    • Introduced version (included): 47.0.0
    • Fixed boundary (excluded): 47.0.3
    Additional upstream package constraints
    {
  "ecosystem": {
    "affected_functions": null,
    "affects": {
      "arch": [],
      "functions": [],
      "os": []
    }
  },
  "database": {
    "categories": [],
    "cvss": "CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L",
    "informational": null,
    "source": "https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0222.json"
  }
}
    RustSec · RUSTSEC-2026-0222 · Updated 2026-10-24T06:25:41Z

Vendor product assessments

  • rhcl-1/wasm-shim-rhel9 as a component of Red Hat Connectivity Link 1 · known affected

    Vendor assessment for this product only.

    pkg:oci/wasm-shim-rhel9@sha256:6bcf6af9919f21fa2df4bda13fabca665b315815dadc22a79f6d39464fb492f9?repository_url=registry.redhat.io/rhcl-1/wasm-shim-rhel9

    • none available: Fix deferred
    Red Hat · CVE-2026-115393 · Updated 2026-10-23T00:38:24+00:00
  • libtree-sitter as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/libtree-sitter

    • none available: Fix deferred
    Red Hat · CVE-2026-115393 · Updated 2026-10-23T00:38:24+00:00
  • libtree-sitter-devel as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/libtree-sitter-devel

    • none available: Fix deferred
    Red Hat · CVE-2026-115393 · Updated 2026-10-23T00:38:24+00:00
  • virt-firmware-rs.src as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=src

    • none available: Fix deferred
    Red Hat · CVE-2026-115393 · Updated 2026-10-23T00:38:24+00:00

All CVSS metrics

  • LOW 1 v4.0 · CNA Primary
    CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
  • LOW 3.8 v3.1 · CNA Primary
    CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
  • LOW 1 v4.0 · NVD Secondary
    CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:L/VI:L/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
  • LOW 3.8 v3.1 · NVD Primary
    CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS