Firefox Esr CVE-2026-4694

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EUVD

EUVD-2026-14809 HIGH

Integer Overflow or Wraparound (CWE-190)

2026-03-24 mozilla

GHSA-pm4j-pmqr-8gq4

Buffer Overflow Integer Overflow Mozilla Firefox Esr

7.5

CVSS 3.1 · NVD

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Attack ChainAIDerived

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

Access

Craft malformed graphics data
Exploit

Trigger integer overflow in Graphics component
Execution

Bypass boundary validation
Impact

Cause denial of service crash

Vulnerability Assessment

Weakness	CWE CWE-190 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Integer overflow checks MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Remote unauthenticated attacker can trigger denial of service against Firefox < 149, Firefox ESR < 115.34, or Firefox ESR < 140.9. No special configuration required. Exploitation likely requires victim to visit a malicious webpage or process crafted graphical content.
Impact	The real-world risk for this vulnerability is substantial, despite the absence of CVSS scoring and EPSS data. Multiple factors indicate high priority: (1) Mozilla issued three separate security advisories (MFSA2026-20, MFSA2026-21, and MFSA2026-22), suggesting the flaw affects multiple product versions requiring coordinated patching; (2) The vulnerability class (boundary condition + integer overflow leading to buffer overflow) historically results in memory corruption with potential for code execution; (3) The Graphics component is part of the core rendering engine that processes untrusted input from web content, making it reachable without privilege escalation; (4) Mozilla's ESR release strategy indicates this affects long-term supported versions, suggesting broader organizational impact. The lack of CVSS/EPSS data may reflect timing delays in CVE publication rather than low severity. This should be treated as a critical patch requiring immediate deployment, particularly for organizations using Firefox ESR for managed deployments.
Exploit ScenarioDerived	An attacker crafts a malicious web page containing specifically designed graphics data that triggers the integer overflow condition in Firefox's Graphics component. When a victim visits the malicious page, the browser processes the graphics without proper boundary validation, causing a buffer overflow in memory. This could allow the attacker to overwrite adjacent memory structures and achieve arbitrary code execution in the context of the browser process, potentially stealing credentials, injecting malware, or pivoting to the underlying system. The attack requires no user interaction beyond visiting a webpage and would work against all affected Firefox versions without requiring local privileges.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 24, 2026

A boundary condition vulnerability combined with an integer overflow flaw exists in the Graphics component of Mozilla Firefox, affecting Firefox versions prior to 149, Firefox ESR versions prior to 115.34, and Firefox ESR versions prior to 140.9. This vulnerability could allow an attacker to trigger a buffer overflow through specially crafted graphics data, potentially leading to memory corruption and arbitrary code execution. While no CVSS score or EPSS data is currently available, the Mozilla security advisories confirm the vulnerability affects multiple product lines across different release channels.

RemediationAI

Immediately upgrade Mozilla Firefox to version 149 or later, and upgrade Firefox ESR installations to either version 115.34 or version 140.9 or later depending on the ESR channel in use. Organizations should determine which ESR branch is deployed and apply the corresponding patch from Mozilla's security advisories. For endpoints where immediate patching is not possible, restrict web browsing to trusted internal sites only and consider deploying a proxy-based content filter to block potentially malicious graphics content. Disable JavaScript execution in untrusted contexts if operationally feasible. Monitor the Mozilla security advisory pages (https://www.mozilla.org/security/advisories/) for any indicators of active exploitation or additional guidance.

Affected VersionsENISA

Firefox unspecified <149

Firefox ESR unspecified <115.34

Firefox ESR unspecified <140.9

Affected Packages

euvd firefox_esr_unspecified fix: 115.34, 140.9

euvd firefox_unspecified fix: 149

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in euvd

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Technical ContextAI · show details

The vulnerability resides in the Graphics rendering component of Mozilla Firefox, a core library responsible for processing and rendering graphical content in the browser. The root cause stems from improper boundary condition validation combined with integer overflow logic—as identified by the reported tags indicating buffer overflow and the underlying integer arithmetic issues. When processing graphics input, the component fails to properly validate array or buffer boundaries before performing calculations that may overflow, resulting in out-of-bounds memory access. The affected products span multiple Firefox release channels (mainline and Extended Support Release variants) as indicated by the CPE strings: cpe:2.3:a:mozilla:firefox and cpe:2.3:a:mozilla:firefox_esr, meaning the issue affects the core Graphics subsystem across all affected versions.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

SUSE HIGH

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

None

Integrity

None

Availability

High

Lifecycle Timeline

2

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

CVE Published

Mar 24, 2026 - 12:30 nvd

HIGH 7.5

DescriptionNVD

Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9.

Executive ViewAI

Why It Matters

Organizations using the Graphics component. This vulnerability affects Firefox face notable risk from CVE-2026-4694, a integer overflow vulnerability rated CVSS 7.5. Exploitation could allow attackers to corrupt memory, crash the application, or potentially execute arbitrary code. Organizations should apply vendor updates when available and consider compensating controls in the interim.

Business Impact: High

Compensating Controls

Apply vendor patch. If immediate patching is not feasible: (1) Implement network-level access controls to limit exposure; (2) Enable enhanced monitoring and alerting; (3) Apply principle of least privilege.

Threat Intelligence Overview

EPSS Score

0.0%

Top 99% exploitable

Data Quality

7 sources

Confidence: High

EUVD

CVE.org

EPSS

Vulnrichment 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 HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

Yes

Human Impact

High

Technical Impact

Partial

Priority Score

38

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Integer Overflow MEDIUM

Integer overflow occurs when an arithmetic operation produces a result that exceeds the maximum value a given integer type can store.

Related Vulnerabilities in Firefox Multiple Component Vulnerabilities

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CVE-2026-4728 MEDIUM

CVE-2026-4692 CRITICAL POC

CVE-2026-4685 HIGH

CVE-2026-4686 HIGH

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CVE-2026-4688 CRITICAL

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CVE-2026-4724 CRITICAL

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In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable

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Mozilla developers Andrew McCreight, Gabriele Svelto, Tom Ritter and the Mozilla Fuzzing Team reported memory safety bug

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CVE-2022-26384 CRITICAL Act Now POC

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CVE-2022-34484 HIGH This Week POC

The Mozilla Fuzzing Team reported potential vulnerabilities present in Thunderbird 91.10. Rated high severity (CVSS 8.8)

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CVE-2022-26381 HIGH This Week POC

An attacker could have caused a use-after-free by forcing a text reflow in an SVG object leading to a potentially exploi

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Applying a CSS filter effect could have accessed out of bounds memory. Rated high severity (CVSS 8.8), this vulnerabilit

Same weakness CWE-190 – Integer Overflow or Wraparound

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Same technique Buffer Overflow

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CVE-2009-0927 HIGH POC

CVE-2012-1889 HIGH POC

Vendor StatusVendor

Debian

firefox

Release	Status	Fixed Version	Urgency
sid	vulnerable	148.0.2-1	-
(unstable)	fixed	(unfixed)	-

firefox-esr

Release	Status	Fixed Version	Urgency
bullseye	vulnerable	115.14.0esr-1~deb11u1	-
bullseye (security)	vulnerable	140.8.0esr-1~deb11u1	-
bookworm	vulnerable	128.14.0esr-1~deb12u1	-
bookworm (security)	vulnerable	140.8.0esr-1~deb12u1	-
trixie (security), trixie	vulnerable	140.8.0esr-1~deb13u1	-
forky, sid	vulnerable	140.8.0esr-1	-
(unstable)	fixed	(unfixed)	-

SUSE

Severity: High

Product	Status
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-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-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 10	Fixed
SUSE Liberty Linux 8	Fixed
SUSE Liberty Linux 9	Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7	Fixed

References

Advisories & patches

ADVISORY https://access.redhat.com/errata/RHSA-2026:5930 ADVISORY https://access.redhat.com/errata/RHSA-2026:5931 ADVISORY https://access.redhat.com/errata/RHSA-2026:5932 ADVISORY https://access.redhat.com/errata/RHSA-2026:6188 ADVISORY https://access.redhat.com/errata/RHSA-2026:6342 ADVISORY https://access.redhat.com/errata/RHSA-2026:6917 ADVISORY https://access.redhat.com/errata/RHSA-2026:7837 ADVISORY https://access.redhat.com/errata/RHSA-2026:7838 ADVISORY https://access.redhat.com/errata/RHSA-2026:7839 ADVISORY https://access.redhat.com/errata/RHSA-2026:7840 ADVISORY https://access.redhat.com/errata/RHSA-2026:7841 ADVISORY https://access.redhat.com/errata/RHSA-2026:7842 ADVISORY https://access.redhat.com/errata/RHSA-2026:7843 ADVISORY https://access.redhat.com/errata/RHSA-2026:7845 ADVISORY https://access.redhat.com/errata/RHSA-2026:7858 ADVISORY https://access.redhat.com/errata/RHSA-2026:8284 ADVISORY https://access.redhat.com/errata/RHSA-2026:8285 ADVISORY https://access.redhat.com/errata/RHSA-2026:8286 ADVISORY https://access.redhat.com/errata/RHSA-2026:8287 ADVISORY https://access.redhat.com/errata/RHSA-2026:8288 ADVISORY https://access.redhat.com/errata/RHSA-2026:8289 ADVISORY https://access.redhat.com/errata/RHSA-2026:8290 ADVISORY https://access.redhat.com/errata/RHSA-2026:8315 ADVISORY https://access.redhat.com/errata/RHSA-2026:8427 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-4694 ADVISORY https://vuldb.com/?id.352743 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1126/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1127/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1163/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20978/ REF https://access.redhat.com/errata/RHSA-2026:8850 REF https://access.redhat.com/security/cve/CVE-2026-4694 REF https://bugzilla.mozilla.org/show_bug.cgi?id=2018430 REF https://bugzilla.redhat.com/show_bug.cgi?id=2450747 REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4694.json REF https://www.mozilla.org/security/advisories/mfsa2026-20/ REF https://www.mozilla.org/security/advisories/mfsa2026-21/ REF https://www.mozilla.org/security/advisories/mfsa2026-22/ REF https://www.mozilla.org/security/advisories/mfsa2026-23/ REF https://www.mozilla.org/security/advisories/mfsa2026-24/

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