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Thunderbird CVE-2026-2759

CRITICAL
Improper Handling of Physical or Environmental Conditions (CWE-1384)
2026-02-24 security@mozilla.org
Information Disclosure Mozilla Thunderbird
9.8
CVSS 3.1 · NVD
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Send crafted image file
  2. Exploit
    ImageLib parser processes boundary conditions incorrectly
  3. Execution
    Memory corruption occurs
  4. Impact
    Execute arbitrary code with browser privileges

Vulnerability Assessment

Weakness
CWE
CWE-1384
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Hardware security control
Exploitation Conditions

No special conditions — remote unauthenticated exploitation against default configurations of Firefox < 148, Firefox ESR < 115.33/140.8, Thunderbird < 148/140.8 when processing untrusted image files.
Impact

CVSS 9.8. Exploitable through malicious images on web pages.
Exploit ScenarioDerived

Crafted image triggers boundary violation in ImageLib, corrupting memory and potentially enabling code execution.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Boundary violation in Firefox ImageLib graphics component before 148 enables memory corruption through crafted images.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 21:55 CVSS 9.8

Boundary error in Firefox ImageLib.

RemediationAI

Update Firefox to 148+.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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Technical ContextAI · show details

CWE-1384 incorrect boundary conditions in image processing library.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE CRITICAL
Red Hat 7.5 HIGH

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Patch released
Apr 10, 2026 - 08:30 nvd
Patch available
CVE Published
Feb 24, 2026 - 14:16 nvd
CRITICAL 9.8

DescriptionNVD

Incorrect boundary conditions in the Graphics: ImageLib component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

Executive ViewAI

Why It Matters

A critical vulnerability (CVSS 9.8) in Firefox and Thunderbird's image processing component allows unauthenticated remote code execution through maliciously crafted image files. This affects all users of Firefox, Firefox ESR, Thunderbird, and Thunderbird ESR across the organization, with no currently available patch, creating immediate exploitation risk.

Business Impact: Severe
Compensating Controls

Implement email gateway content filtering to block suspicious image files and archives containing images; disable automatic image rendering in Thunderbird and disable plugins in Firefox where operationally feasible; segment networks to limit lateral movement if exploitation occurs; deploy endpoint detection and response (EDR) to monitor for process injection and code execution anomalies; restrict user permissions to limit privilege escalation impact; monitor Mozilla security advisories for emergency patch releases.

Threat Intelligence Overview

EPSS Score
0.1%
Top 81% exploitable
Data Quality
5 sources
Confidence: Medium
NVD CVE.org EPSS Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Out-of-Cycle
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Very High

Priority Score

49
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

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5.0 Apr 01

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Same weakness CWE-1384 – Improper Handling of Physical or Environmental Conditions

View all
CVE-2026-2760 CRITICAL
10.0
CVE-2026-2757 CRITICAL
9.8
CVE-2025-52557 HIGH
8.6
CVE-2024-39355 MEDIUM
5.7
CVE-2026-49325 MEDIUM
4.1

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2025-68613 HIGH POC
8.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5

Vendor StatusVendor

SUSE

Severity: Critical
Product Status
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.61 Container suse/sl-micro/6.0/base-os-container:2.1.3-7.27 Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.52 Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.63 Container suse/sl-micro/6.0/toolbox:13.2-9.16 Image SL-Micro Affected
Image SL-Micro-BYOS-GCE Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Affected
Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected
SUSE Liberty Linux 8 Fixed

References

Advisories & patches
ADVISORY https://access.redhat.com/errata/RHSA-2026:3338 ADVISORY https://access.redhat.com/errata/RHSA-2026:3339 ADVISORY https://access.redhat.com/errata/RHSA-2026:3361 ADVISORY https://access.redhat.com/errata/RHSA-2026:3491 ADVISORY https://access.redhat.com/errata/RHSA-2026:3492 ADVISORY https://access.redhat.com/errata/RHSA-2026:3493 ADVISORY https://access.redhat.com/errata/RHSA-2026:3494 ADVISORY https://access.redhat.com/errata/RHSA-2026:3495 ADVISORY https://access.redhat.com/errata/RHSA-2026:3496 ADVISORY https://access.redhat.com/errata/RHSA-2026:3497 ADVISORY https://access.redhat.com/errata/RHSA-2026:3515 ADVISORY https://access.redhat.com/errata/RHSA-2026:3516 ADVISORY https://access.redhat.com/errata/RHSA-2026:3517 ADVISORY https://access.redhat.com/errata/RHSA-2026:3976 ADVISORY https://access.redhat.com/errata/RHSA-2026:3978 ADVISORY https://access.redhat.com/errata/RHSA-2026:3979 ADVISORY https://access.redhat.com/errata/RHSA-2026:3980 ADVISORY https://access.redhat.com/errata/RHSA-2026:3981 ADVISORY https://access.redhat.com/errata/RHSA-2026:3982 ADVISORY https://access.redhat.com/errata/RHSA-2026:3983 ADVISORY https://access.redhat.com/errata/RHSA-2026:3984 ADVISORY https://access.redhat.com/errata/RHSA-2026:4022 ADVISORY https://access.redhat.com/errata/RHSA-2026:4152 ADVISORY https://access.redhat.com/errata/RHSA-2026:4260 ADVISORY https://access.redhat.com/errata/RHSA-2026:4432 ADVISORY https://vuldb.com/vuln/347549 ADVISORY https://www.mozilla.org/security/advisories/mfsa2026-13/ ADVISORY https://www.mozilla.org/security/advisories/mfsa2026-14/ ADVISORY https://www.mozilla.org/security/advisories/mfsa2026-15/ ADVISORY https://www.mozilla.org/security/advisories/mfsa2026-16/ ADVISORY https://www.mozilla.org/security/advisories/mfsa2026-17/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0812/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0871/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0880/ REF https://access.redhat.com/security/cve/CVE-2026-2759 REF https://bugzilla.mozilla.org/show_bug.cgi?id=2010933 REF https://bugzilla.redhat.com/show_bug.cgi?id=2442307 REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2759.json

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