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CVE Record

CVE-2026-4694: Incorrect boundary conditions, integer overflow in the Graphics component

Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-4694 is a high-severity Mozilla Graphics component flaw involving incorrect boundary handling and integer overflow. The documented impact is denial of service, not data theft or code execution. Mozilla states it is fixed in Firefox 149, Firefox ESR 115.34/140.9, Thunderbird 149, and Thunderbird 140.9.

Executive priority

Treat this as a prompt patching item for browser and mail-client fleets. Business risk is service disruption rather than confirmed breach. Prioritize managed endpoints and Red Hat package streams, but avoid emergency incident assumptions unless new exploitation evidence appears.

Technical view

The CVE maps to CWE-190 and CWE-754 in Mozilla's Graphics component. CVSS 3.1 is 7.5 with network attack vector, low complexity, no privileges, no user interaction, unchanged scope, and high availability impact only. The source bundle does not provide exploit mechanics or vulnerable version ranges beyond fixed releases.

Likely exposure

Exposure is most likely on endpoints, servers, or managed Linux fleets running Firefox, Firefox ESR, or Thunderbird below the fixed Mozilla releases. Red Hat references and errata indicate downstream package relevance, but affected Red Hat product scope should be confirmed from vendor advisories.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation. CVSS indicates remote, unauthenticated, low-complexity denial-of-service potential without user interaction. No cited source in the bundle supports claims of public exploit code, exploitation in the wild, or confidentiality/integrity impact.

Researcher notes

Key gaps are vulnerable version ranges, root-cause details, and exploitability constraints. Use CVSS and vendor fixed-version statements as the primary evidence. Do not infer memory corruption impact beyond availability because the provided scoring shows no confidentiality or integrity impact.

Mitigation direction

  • Update Firefox to 149, ESR 115.34, or ESR 140.9 as applicable.
  • Update Thunderbird to 149 or 140.9 as applicable.
  • Apply relevant Red Hat security errata for managed Linux packages.
  • Check Mozilla and OS vendor guidance for any environment-specific mitigations.
  • Prioritize systems where browser or mail client availability is operationally important.

Validation and detection

  • Inventory Firefox, Firefox ESR, and Thunderbird versions across endpoints and servers.
  • Confirm installed versions meet or exceed the fixed Mozilla releases.
  • Review Red Hat errata applicability for each subscribed product stream.
  • Verify endpoint management reports show successful deployment, not only assignment.
  • Monitor Mozilla, Red Hat, and KEV sources for exploitation status changes.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-190: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · low confidence lookup

CWE-754: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-4694 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
35Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6CISA-ADP
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-4694Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
redhat-SADPfirefox: thunderbird: Incorrect boundary conditions, integer overflow in the Graphics component
other:Red Hat severity ratingcvssV3_1
  • 2026-03-24T13:03:21.493Z: Reported to Red Hat.
  • 2026-03-24T12:30:25.919Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaFirefox115.34, 140.9, 149Listed
MozillaThunderbird140.9, 149Listed
Weakness

CWE details

CWE-190CWE-754

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-190 · source CWE mapping

Integer Overflow or Wraparound

Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-754 · source CWE mapping

Improper Check for Unusual or Exceptional Conditions

Improper Check for Unusual or Exceptional Conditions represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs