CVE-2025-11719Hinoki check available

Crash via movable native-messaging I/O buffer

Published Oct 14, 2025 · Updated Oct 14, 2025

Use-after-free memory corruption in Mozilla Firefox and Thunderbird 143 on Windows allows attackers to crash the main process. Windows pipe code retains a pointer to an inline ArrayBuffer during asynchronous I/O, but compacting garbage collection can move the buffer before ReadFile or WriteFile completes. Triggering requires an installed extension that uses native messaging and winning an unreliable race; the demonstrated consequence is an application crash.

CVSS severity9.8
Critical
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free memory corruption in Mozilla Firefox and Thunderbird 143 on Windows allows attackers to crash the main process. Windows pipe code retains a pointer to an inline ArrayBuffer during asynchronous I/O, but compacting garbage collection can move the buffer before ReadFile or WriteFile completes. Triggering requires an installed extension that uses native messaging and winning an unreliable race; the demonstrated consequence is an application crash.

The record

CVE
CVE-2025-11719
Published
Oct 14, 2025
Updated
Oct 14, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-416, T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <144

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Mozilla · Firefoxversion=unspecified <144
Mozilla · Thunderbirdversion=unspecified <144

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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