CVE-2026-115384

validating

GHSA-6fff-wrjr-wjxr ↗

no check availablenot proven exploitable

cve.orgpublic pockev

bytecodealliance wasmtime

ETK-2026-2510, permanent identifier

cvss9.9cna vendorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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startingcurrent stage

timeline

0 = trigger signal

trigger signal (cve.org) +0h

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description

Wasmtime versions 39.0.0 through 48.0.3 and 49.0.0 through 49.0.1 are affected by a native-stack buffer overflow in component-model asynchronous callback handling. A malicious guest component may crash the host or break out of the WebAssembly sandbox when it can invoke an async callback with mismatched result types.

Still under analysis: more detail becomes available as the pipeline runs.

mitigation

Upgrade Wasmtime 39.x through 48.x to 48.0.4 or later, and upgrade 49.0.0 or 49.0.1 to 49.0.2 or later. Until upgraded, do not run untrusted components that use component-model async callbacks.

check

building now

exploit

not yet

automation

–

auth required

yes, low privileges

EPSS

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agent run time

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cve.org record, t = 0

2026-10-22 19:13Z

Δ to public poc

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Δ to kev

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outcome

Run in progress: no artifact yet.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

2026-10-22 19:13Z
ghsa: trigger signal, started the run
https://github.com/advisories/GHSA-6fff-wrjr-wjxr
2026-10-22 19:13Z
cve.org record for CVE-2026-115384
cve_org · https://www.cve.org/CVERecord?id=CVE-2026-115384

this entry in the feed

GET /api/v1/feed/CVE-2026-115384

{
  "etk_id": "ETK-2026-2510",
  "cve_id": "CVE-2026-115384",
  "display_id": "CVE-2026-115384",
  "ghsa_id": "GHSA-6fff-wrjr-wjxr",
  "euvd_id": null,
  "status": "in_pipeline",
  "anchor_state": "anchored",
  "title": "Stack buffer overflow in Wasmtime async callbacks",
  "summary": "Wasmtime versions 39.0.0 through 48.0.3 and 49.0.0 through 49.0.1 are affected by a native-stack buffer overflow in component-model asynchronous callback handling. A malicious guest component may crash the host or break out of the WebAssembly sandbox when it can invoke an async callback with mismatched result types.",
  "mitigation": "Upgrade Wasmtime 39.x through 48.x to 48.0.4 or later, and upgrade 49.0.0 or 49.0.1 to 49.0.2 or later. Until upgraded, do not run untrusted components that use component-model async callbacks.",
  "vendor": "bytecodealliance",
  "product": "wasmtime",
  "affected": [],
  "cwes": null,
  "cvss_score": 9.9,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": null,
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": null,
  "t0_at": "2026-10-22T19:13:51.422000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-22T19:13:51.422000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-22T19:13:51.422000+00:00",
      "url": "https://github.com/advisories/GHSA-6fff-wrjr-wjxr"
    }
  }
}

published 2026-10-22 21:48Z
last change 2026-10-22 21:48Z

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