CVE-2026-84143Network attack vector

Unspecified impact via undisclosed memory corruption

Published Sep 1, 2026 · Updated Sep 3, 2026

Memory corruption in Mozilla Thunderbird 154, ESR 153.1, and ESR 140.14 allows remote attackers to cause unspecified impact via network input. Mozilla groups multiple internally found defects under this identifier but does not disclose their components or the operations that mishandle input. No authentication or user interaction is required according to CISA’s assessment, although ordinary email reading generally does not expose the defects because scripting is disabled.

CVSS severity9.8
Critical
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory corruption in Mozilla Thunderbird 154, ESR 153.1, and ESR 140.14 allows remote attackers to cause unspecified impact via network input. Mozilla groups multiple internally found defects under this identifier but does not disclose their components or the operations that mishandle input. No authentication or user interaction is required according to CISA’s assessment, although ordinary email reading generally does not expose the defects because scripting is disabled.

The record

CVE
CVE-2026-84143
Published
Sep 1, 2026
Updated
Sep 3, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo