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CVE Record

CVE-2026-2769: Use-after-free in the Storage: IndexedDB component

Use-after-free in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-2769 is a high-severity Mozilla memory-safety flaw in IndexedDB storage handling. A user would need to interact with malicious content, but successful exploitation could affect data confidentiality, integrity, and availability. Mozilla lists fixes in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Executive priority

Treat as a high-priority patching item for browser and email-client fleets. There is no provided evidence of active exploitation, but the impact is broad enough to justify prompt remediation through standard endpoint update channels.

Technical view

The issue is a CWE-416 use-after-free in Mozilla's Storage: IndexedDB component. The CVSS 3.1 vector is network-reachable, low complexity, no privileges required, user interaction required, unchanged scope, with high confidentiality, integrity, and availability impact. The provided sources do not include exploit mechanics.

Likely exposure

Exposure is most likely where Firefox or Thunderbird are deployed below the fixed releases. The source bundle does not provide complete vulnerable version ranges, so inventory should compare installed versions against Mozilla and Red Hat advisories.

Exploitation context

The bundle does not show CISA KEV listing or cited evidence of active exploitation. Risk remains material because browser and mail-client memory corruption flaws can be reached through untrusted content when a user interacts.

Researcher notes

The public bundle identifies the bug class, component, fixed Mozilla releases, CVSS vector, and Red Hat advisories. It does not provide detailed root cause, proof-of-concept status, exploitability notes, or complete vulnerable version ranges.

Mitigation direction

  • Update Firefox to the applicable fixed release listed by Mozilla.
  • Update Thunderbird to the applicable fixed release listed by Mozilla.
  • Apply relevant Red Hat security advisories where Mozilla packages are supplied by Red Hat.
  • Check vendor guidance for platform-specific package names and backports.
  • Prioritize managed browser and mail-client fleets exposed to untrusted content.

Validation and detection

  • Inventory Firefox and Thunderbird versions across endpoints and servers.
  • Confirm installed versions meet or exceed the Mozilla fixed releases.
  • Review Red Hat errata applicability for affected enterprise Linux assets.
  • Check vulnerability scanners for CVE-2026-2769 coverage and version accuracy.
  • Verify no unsupported Mozilla ESR branches remain in use.
Prepared
Confidence
high
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-416: 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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cve · low confidence lookup

CVE-2026-2769 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
35Source 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-2026-2769Attack 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: Use-after-free in the Storage: IndexedDB component
other:Red Hat severity ratingcvssV3_1
  • 2026-02-24T14:02:40.379Z: Reported to Red Hat.
  • 2026-02-24T13:33:06.912Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaFirefox115.33, 140.8, 148Listed
MozillaThunderbird140.8, 148Listed
Weakness

CWE details

CWE-416

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

CWE-416 · source CWE mapping

Use After Free

Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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