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CVE Record

CVE-2026-2774: Integer overflow in the Audio/Video component

Integer overflow in the Audio/Video 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-2026-2774 is a high-severity Mozilla audio/video processing flaw. A user likely must open or view content that reaches the vulnerable component. Mozilla says it is fixed in Firefox 148, Firefox ESR 115.33 and 140.8, Thunderbird 148, and Thunderbird 140.8.

Executive priority

Treat as urgent patching for managed browsers and mail clients because impact is high and user-triggered content is a realistic enterprise exposure path. Prioritize internet-facing users and systems handling untrusted media or messages.

Technical view

The issue is an integer overflow in Mozilla's Audio/Video component, classified as CWE-190. The CVSS 3.1 vector is 8.8 high: network-reachable, low complexity, no privileges, user interaction required, with high confidentiality, integrity, and availability impact.

Likely exposure

Primary exposure is outdated Mozilla Firefox or Thunderbird installations before the fixed releases named by Mozilla. Red Hat also published CVE, VEX, and errata entries, so Linux package consumers should check vendor package status.

Exploitation context

The source bundle does not show CISA KEV listing or cite active exploitation. The CVSS vector indicates exploitation requires user interaction, likely through crafted media or content processed by the affected audio/video component.

Researcher notes

Evidence is limited to advisory-level detail. The bundle identifies an integer overflow but does not provide root-cause specifics, exploit primitives, or proof of active exploitation. Avoid assuming affected forks or exploitability beyond Mozilla and vendor advisories.

Mitigation direction

  • Update Firefox to Mozilla's fixed release line for your channel.
  • Update Thunderbird to Mozilla's fixed release line for your channel.
  • Apply relevant Red Hat errata where Mozilla packages are vendor-managed.
  • Check Mozilla and OS vendor advisories for exact package names and versions.

Validation and detection

  • Inventory Firefox and Thunderbird versions across endpoints and servers.
  • Confirm deployed versions meet or exceed Mozilla's fixed releases.
  • Review Red Hat package advisories if using Red Hat-managed Mozilla builds.
  • Check vulnerability scanner findings against vendor fixed-version guidance.
Prepared
Confidence
high
Sources
11

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
cve · low confidence lookup

CVE-2026-2774 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
8.8 (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-2026-2774Attack 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: Integer overflow in the Audio/Video component
other:Red Hat severity ratingcvssV3_1
  • 2026-02-24T14:02:20.295Z: Reported to Red Hat.
  • 2026-02-24T13:33:10.821Z: 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-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