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CVE Record

CVE-2026-8090: Use-after-free in the DOM: Networking component

Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-8090 is a high-severity memory-safety flaw in Mozilla’s DOM networking code. An attacker could target a user running an unpatched Firefox or Thunderbird release; successful exploitation could compromise data, application integrity, and availability. The supplied evidence confirms fixed releases but does not establish active exploitation.

Executive priority

Prioritize remediation promptly because browsers and mail clients routinely process untrusted content and the potential impact spans data theft, modification, and disruption. Emergency incident response is not justified solely by this bundle because active exploitation is not established.

Technical view

This use-after-free involves an expired memory reference in the DOM networking component, classified as CWE-416 and CWE-825. CVSS 3.1 scores it 7.5: remotely reachable, high complexity, no privileges required, and user interaction required, with potentially high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is most likely on managed or personal Firefox and Thunderbird installations that have not received the applicable fixed release. The bundle does not provide complete vulnerable-version ranges, so inventory comparisons should treat the named versions as remediation thresholds, not confirmed affected versions.

Exploitation context

The CVSS vector indicates a remote attack requiring user interaction and high attack complexity, without prior privileges. CVE-2026-8090 is not listed as KEV in the supplied bundle, and no supplied source establishes active exploitation or a public proof of concept.

Researcher notes

The bundle identifies the weakness classes, component, CVSS vector, and fixed releases, but omits root-cause and trigger details. It also places fixed release numbers in an affected-products structure; analysts should not interpret those numbers as vulnerable versions. Exact affected-version boundaries remain incomplete in the supplied evidence.

Mitigation direction

  • Update Firefox to 150.0.2, ESR 140.10.2, or ESR 115.35.2, as applicable.
  • Update Thunderbird to 150.0.2 or 140.10.2, as applicable.
  • Use Mozilla or operating-system vendor guidance for packaged deployments.
  • Prioritize internet-facing user workstations and systems processing untrusted content.

Validation and detection

  • Inventory installed Firefox and Thunderbird versions across endpoints.
  • Confirm each installation meets an applicable fixed release threshold.
  • Verify managed update policies successfully deployed and retained the update.
  • Review Mozilla and distribution advisories for platform-specific package status.
  • Re-scan endpoints after remediation to identify missed or reverted installations.
Prepared
Confidence
high
Sources
8

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.

Open ATT&CK lookup
cwe · low confidence lookup

CWE-825: 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-2026-8090 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
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/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
31Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

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
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
7.3CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L3.93.4CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-8090Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/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 DOM: Networking component
other:Red Hat severity ratingcvssV3_1
  • 2026-05-07T13:01:29.594Z: Reported to Red Hat.
  • 2026-05-07T12:45:04.609Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
MozillaFirefox115.35.2, 140.10.2, 150.0.2Listed
MozillaThunderbird140.10.2, 150.0.2Listed
Weakness

CWE details

CWE-416CWE-825

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
CWE-825 · source CWE mapping

Expired Pointer Dereference

Expired Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs