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CVE Record

CVE-2026-0882: Use-after-free in the IPC component

Use-after-free in the IPC 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-2026-0882 is a high-severity Mozilla memory-safety issue in the IPC component. It is fixed in current Firefox, Firefox ESR, and Thunderbird releases listed by Mozilla. Successful exploitation requires user interaction and could seriously affect confidentiality, integrity, and availability. The provided sources do not show active exploitation.

Executive priority

Prioritize expedited client patching, especially for users who browse externally or process email. This is high severity, but the provided evidence does not support calling it actively exploited.

Technical view

The flaw is a use-after-free (CWE-416) in Mozilla IPC. CVSS 3.1 is 8.8: network attack vector, low complexity, no privileges, user interaction required, unchanged scope, and high CIA impact. Mozilla says it was fixed in Firefox 147, Firefox ESR 115.32/140.7, Thunderbird 147, and Thunderbird 140.7.

Likely exposure

Organizations running Firefox, Firefox ESR, or Thunderbird below the fixed releases are the primary concern. Exposure is strongest on endpoints where users browse the web or handle email. Red Hat references indicate downstream package advisories exist, so Linux-packaged builds should be checked against vendor errata.

Exploitation context

The source bundle does not include a public exploit, exploitation report, or CISA KEV listing. The CVSS vector indicates remote delivery is plausible but user interaction is required. No source provided enough detail to describe the trigger safely or reliably.

Researcher notes

Public details are limited. Mozilla identifies the bug class and component, but the provided sources do not include trigger conditions, proof of concept, or exploit telemetry. Treat affected-version mapping carefully because the bundle lists fixed releases more clearly than full vulnerable ranges.

Mitigation direction

  • Update Firefox to 147, ESR 115.32/140.7, or later.
  • Update Thunderbird to 147 or 140.7, or later.
  • Apply relevant Red Hat security advisories for packaged Mozilla builds.
  • If patching is delayed, follow Mozilla and OS vendor guidance.

Validation and detection

  • Inventory endpoints for installed Firefox, Firefox ESR, and Thunderbird versions.
  • Confirm versions meet or exceed the Mozilla fixed releases.
  • Check Red Hat errata status for distribution-managed packages.
  • Review vulnerability scanner results for CVE-2026-0882.
  • Monitor Mozilla advisories for any updated guidance.
Prepared
Confidence
medium
Sources
9

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-2026-0882 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
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-2026-0882Attack 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 IPC component
other:Red Hat severity ratingcvssV3_1
  • 2026-01-13T14:01:39.370Z: Reported to Red Hat.
  • 2026-01-13T13:30:55.562Z: 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-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.

Open CWE intelligenceSame-CWE CVEs