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FirefoxWeb browser · Mozilla

CVE-2026-8092

HIGH · 8.1 CVSS v3.1 Published 2026-05-07
Fix available
A fix is available. Upgrade to 115.35.2 / 140.10.2 or later.
See remediation →
90/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Memory safety bugs in Firefox ESR 115.35.1, Firefox ESR 140.10.1, Firefox 150.0.1, and corresponding Thunderbird versions allowed memory corruption that could potentially be exploited for arbitrary code execution.

MitigationUpdate affected installations to Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, or Thunderbird 140.10.2.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
FirefoxWeb browser
Affected:< 115.35.2>= 140.0, < 140.10.2>= 150.0, < 150.0.2
ThunderbirdApplication
Affected:>= 140.0, < 140.10.2>= 150.0, < 150.0.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Check if Firefox is installed
    Run 'firefox --version' in command line, or check Help > About Firefox in the application, or check registry on Windows at HKLM\SOFTWARE\Mozilla\Mozilla Firefox\CurrentVersion
    Affected if Firefox is installed and its version is below 115.35.2, OR between 140.0 and 140.10.2, OR between 150.0 and 150.0.2
  2. Check if Thunderbird is installed
    Run 'thunderbird --version' in command line, or check Help > About Thunderbird in the application, or check registry on Windows at HKLM\SOFTWARE\Mozilla\Mozilla Thunderbird\CurrentVersion
    Affected if Thunderbird is installed and its version is between 140.0 and 140.10.2, OR between 150.0 and 150.0.2
  3. Verify browser content handling
    Confirm that Firefox is used for browsing untrusted or external websites, or that Thunderbird has HTML email rendering enabled
    Affected if The application regularly processes untrusted web content through browsing or email rendering features

You are affected if you have Firefox version 115.35.2 or lower, or any version from 140.0 to 140.10.2, or any version from 150.0 to 150.0.2; or Thunderbird version 140.0 to 140.10.2, or 150.0 to 150.0.2, and these applications handle untrusted web content.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 115.35.2 / 140.10.2 / 150.0.2 or later
Fixed in 115.35.2140.10.2150.0.2
Interim mitigation

Update affected installations to Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, or Thunderbird 140.10.2.

Recommended fix High confidence

Firefox ESR 115.35.2, Firefox 140.10.2, Firefox 150.0.2, Thunderbird 140.10.2, or Thunderbird 150.0.2 (depending on which branch is in use)

  1. Check the current installed version of Firefox or Thunderbird (Help > About Firefox/Thunderbird)
  2. If running Firefox ESR 115.x and version is below 115.35.2, upgrade to Firefox ESR 115.35.2
  3. If running Firefox 140.x and version is below 140.10.2, upgrade to Firefox 140.10.2
  4. If running Firefox 150.x and version is below 150.0.2, upgrade to Firefox 150.0.2
  5. If running Thunderbird 140.x and version is below 140.10.2, upgrade to Thunderbird 140.10.2
  6. If running Thunderbird 150.x and version is below 150.0.2, upgrade to Thunderbird 150.0.2
  7. Alternatively, enable automatic updates to receive the latest stable version automatically
Caveat Users on older systems may need to verify their OS meets the minimum requirements for the newer Firefox/Thunderbird versions

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-8092 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data