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CVE Record

CVE-2026-12292: Incorrect boundary conditions in the Web Audio component

Incorrect boundary conditions in the Web Audio component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

HighCVSS 8.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This is a high-severity memory safety issue in Mozilla’s Web Audio component. A user would need to interact with malicious network-delivered content, but successful exploitation could expose or alter sensitive data in the browser or mail client process. Mozilla lists fixed releases for Firefox, Firefox ESR, Thunderbird, and Thunderbird ESR.

Executive priority

Treat as a near-term endpoint patching priority. The issue has high confidentiality and integrity impact, but current evidence in the bundle does not support emergency exploitation response language.

Technical view

CVE-2026-12292 is described as incorrect boundary conditions in Web Audio, mapped to CWE-119 and CWE-787. CVSS 3.1 score is 8.1: network attack vector, low complexity, no privileges required, user interaction required, unchanged scope, high confidentiality and integrity impact, and no availability impact.

Likely exposure

Exposure is likely on endpoints running affected Mozilla Firefox or Thunderbird builds before the fixed versions. Linux environments using Red Hat-packaged Mozilla products should also track the referenced Red Hat advisories and VEX data.

Exploitation context

The provided sources do not show CISA KEV listing or confirmed active exploitation. The CVSS vector supports a remotely delivered scenario requiring user interaction, but the bundle does not provide exploit details or real-world abuse evidence.

Researcher notes

Mozilla’s description is concise and does not include root-cause detail beyond Web Audio boundary conditions. Bugzilla may contain restricted details. Avoid assuming code execution, sandbox escape, or exploit availability unless vendor advisories later state that evidence.

Mitigation direction

  • Update Firefox to 152 or Firefox ESR to 140.12.
  • Update Thunderbird to 152 or Thunderbird 140.12.
  • Apply relevant Red Hat security advisories for packaged Mozilla builds.
  • Check Mozilla and distribution guidance for any environment-specific mitigations.
  • Prioritize managed browser and email client update compliance.

Validation and detection

  • Inventory Firefox and Thunderbird versions across managed endpoints.
  • Confirm installed builds meet or exceed the fixed versions.
  • Review Red Hat advisory applicability for subscribed systems.
  • Verify endpoint management reports successful browser and mail client updates.
  • Monitor vendor advisories for follow-up corrections or additional affected packages.
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-119: 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-787: 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-2026-12292 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
8.1 (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:N

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
21Source 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
8.1CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N2.85.2CISA-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

8.1High
CVSS 3.1 vector shape for CVE-2026-12292Attack 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:N

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 in the Web Audio component
other:Red Hat severity ratingcvssV3_1
  • 2026-06-16T14:02:24.994Z: Reported to Red Hat.
  • 2026-06-16T11:52:25.938Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaFirefox140.12, 152Listed
MozillaThunderbird140.12, 152Listed
Weakness

CWE details

CWE-119CWE-787

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

CWE-119 · source CWE mapping

Improper Restriction of Operations within the Bounds of a Memory Buffer

Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-787 · source CWE mapping

Out-of-bounds Write

Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs