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CVE Record

CVE-2026-0880: Sandbox escape due to integer overflow in the Graphics component

Sandbox escape due to integer overflow in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-0880 is a high-severity Mozilla graphics flaw that could let an attacker escape the browser or mail client sandbox after user interaction. For executives, the concern is endpoint compromise risk from unpatched Firefox or Thunderbird, especially where browsers handle untrusted web content or email links.

Executive priority

Treat this as a near-term endpoint patching priority. It is high impact and user-assisted, but the provided sources do not establish active exploitation. Focus on browsers and mail clients exposed to untrusted content.

Technical view

The source describes an integer overflow in Mozilla's Graphics component leading to sandbox escape. CVSS 3.1 is 8.8 with network attack vector, low complexity, no privileges required, user interaction required, and high confidentiality, integrity, and availability impact. Mozilla says it was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Likely exposure

Exposure is most likely on endpoints running Mozilla Firefox or Thunderbird that have not reached the fixed releases named by Mozilla. The bundle's affected-version metadata is ambiguous because it lists versions that the description says are fixed, so validate against Mozilla advisories and your package source.

Exploitation context

The source bundle does not show CISA KEV inclusion and provides no cited evidence of active exploitation. The practical attack context is user-assisted exposure through malicious or compromised content rendered by Firefox or Thunderbird, with sandbox escape increasing post-trigger impact.

Researcher notes

Key uncertainty is version interpretation: the description names fixed releases while the affected array repeats those version numbers. Use Mozilla advisories and vendor package metadata as authoritative for product-channel status. Do not assume exploitation without KEV or a cited exploitation report.

Mitigation direction

  • Update Firefox and Thunderbird to the fixed Mozilla versions or later.
  • Apply relevant Red Hat security errata where Mozilla packages come from Red Hat channels.
  • Prioritize managed desktop fleets, shared workstations, and high-risk browsing environments.
  • Check Mozilla and OS vendor advisories for channel-specific guidance.
  • Remove or isolate unsupported Firefox or Thunderbird installations.

Validation and detection

  • Inventory Firefox and Thunderbird versions across endpoints and servers.
  • Confirm ESR systems are on Firefox ESR 115.32, ESR 140.7, or later.
  • Confirm Thunderbird systems are on 140.7, 147, or later.
  • Review Red Hat errata applicability for affected Linux deployments.
  • Verify update telemetry or package records after remediation.
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.

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description · low confidence lookup

Privilege behavior lookup

The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2026-0880 mapping review

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

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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
33Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

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
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9CISA-ADP
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H1.65.9redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2026-0880Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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: Sandbox escape due to integer overflow in the Graphics component
other:Red Hat severity ratingcvssV3_1
  • 2026-01-13T14:02:28.897Z: Reported to Red Hat.
  • 2026-01-13T13:30:54.679Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaFirefox115.32, 140.7, 147Listed
MozillaThunderbird140.7, 147Listed
Weakness

CWE details

CWE-190

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