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Firefox MobileWeb browser · Mozilla

CVE-2012-1126

HIGH · 10.0 CVSS v2.0 Published 2012-04-25
Fix available
A fix is available. Upgrade to after 10.0.3 or later.
See remediation →
100/100
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
FreeType before 2.4.9, as used in Mozilla Firefox Mobile before 10.0.4 and other products, allows remote attackers to cause a denial of service (invalid heap read operation and memory corruption) or possibly execute arbitrary code via crafted property data in a BDF font.

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

Heap-based memory corruption vulnerability in FreeType font library versions before 2.4.9 when parsing crafted BDF font files. Specifically, the vulnerability occurs when processing malformed property data within BDF fonts, allowing attackers to perform invalid heap reads and potentially achieve arbitrary code execution.

MitigationUpgrade FreeType library to version 2.4.9 or later, and update Mozilla Firefox Mobile to version 10.0.4 or later. Alternatively, implement input validation to reject malformed BDF fonts before FreeType processes them.

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
Firefox MobileWeb browser
Affected:<= 10.0.3= 1.0= 4.0= 5.0= 6.0= 6.0.1= 6.0.2= 7.0= 8.0= 9.0= 10.0= 10.0.1
FreetypeApplication
Affected:<= 2.4.8= 1.3.1= 2.0.0= 2.0.1= 2.0.2= 2.0.3= 2.0.4= 2.0.5= 2.0.6= 2.0.7= 2.0.8= 2.0.9

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
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

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. Identify installed FreeType library version
    Run 'freetype-config --version' or check the library file version (e.g., libfreetype.so.6) using 'ldd --version' or inspect the library binary metadata
    Affected if The reported version is 2.4.8 or earlier, or falls within the listed affected versions (1.3.1, 2.0.0 through 2.0.9)
  2. Identify installed Mozilla Firefox Mobile version
    Check the application version in the mobile device settings under 'About Firefox' or inspect the app manifest/version file
    Affected if The version matches any of the affected versions listed (10.0.3 or lower, or 1.0, 4.0, 5.0, 6.0.x, 7.0, 8.0, 9.0, 10.0, 10.0.1)
  3. Determine if BDF font parsing functionality is in use
    Search for loaded BDF font files (.bdf extension) or check application logs/configs for BDF font references. Inspect process memory or font configuration for active BDF font usage
    Affected if BDF fonts are loaded or processed by the application using the vulnerable FreeType library
  4. Inspect font loading mechanisms
    Review application code or configuration for calls to FreeType functions (FT_New_Face, FT_Load_Face) with BDF font file paths, or monitor file access for .bdf file opens
    Affected if The application loads BDF font files through FreeType without additional validation

A user is affected if they are running FreeType version 2.4.8 or earlier (or a listed vulnerable 1.x/2.x version) OR Mozilla Firefox Mobile version 10.0.3 or lower (or any listed vulnerable mobile version), AND their system parses BDF font files using the vulnerable library.

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 a release after 10.0.3
Interim mitigation

Upgrade FreeType library to version 2.4.9 or later, and update Mozilla Firefox Mobile to version 10.0.4 or later. Alternatively, implement input validation to reject malformed BDF fonts before FreeType processes them.

Recommended fix High confidence

FreeType 2.4.9+ and Firefox Mobile 10.0.4+

  1. Identify whether the affected FreeType library or Firefox Mobile is in use in the environment
  2. If FreeType is directly used as a library: upgrade FreeType to version 2.4.9 or later
  3. If Firefox Mobile is deployed: upgrade Firefox Mobile to version 10.0.4 or later
  4. After upgrading, verify the new version is installed by checking the library or application version
  5. Test that applications using FreeType or Firefox Mobile still function correctly after the upgrade

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

Fix this in Firefox Mobile Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,380
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,808.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

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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-2012-1126 in production — separate from our analysis above.

No notes yet

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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