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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 memory safety flaw in Mozilla’s IPC component. It affects Firefox and Thunderbird until the fixed releases listed by Mozilla. A user action is required, but successful exploitation could have severe confidentiality, integrity, and availability impact.

Executive priority

Treat this as a high-priority client software update. It is not described as actively exploited in the supplied evidence, but the affected products commonly handle untrusted content and the scored impact is severe.

Technical view

The issue is a CWE-416 use-after-free in Mozilla IPC. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating network reachability, low attack complexity, no privileges, required user interaction, and high impact across CIA.

Likely exposure

Organizations using Firefox, Firefox ESR, or Thunderbird should assume exposure where deployed versions are older than Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, or Thunderbird 140.7.

Exploitation context

The provided sources do not show CISA KEV listing or confirmed active exploitation. The CVSS vector indicates remote attack potential with user interaction required. Public details are limited, so do not infer a working exploit from the advisory alone.

Researcher notes

Evidence is advisory-level: component, weakness class, fixed releases, CVSS, and vendor references are provided. Bugzilla may contain restricted details. No exploit technique, proof of concept, or exploitation-in-the-wild claim is supported by the supplied bundle.

Mitigation direction

  • Upgrade Firefox to 147 or the applicable fixed ESR release.
  • Upgrade Thunderbird to 147 or 140.7 where applicable.
  • Apply relevant Red Hat security advisories for packaged Mozilla products.
  • Prioritize endpoints that process untrusted web or email content.
  • Monitor Mozilla and Red Hat advisories for revised guidance.

Validation and detection

  • Inventory installed Firefox, Firefox ESR, and Thunderbird versions.
  • Confirm deployed versions meet or exceed Mozilla’s fixed releases.
  • Check Linux package status against applicable Red Hat RHSA advisories.
  • Review vulnerability scanner results against CVE-2026-0882.
  • Track exceptions for systems unable to upgrade immediately.
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-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.

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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-2026-0882Attack 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.

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