CVE-2025-9182Network attack vector

Service interruption via WebRender memory exhaustion

Published Aug 19, 2025 · Updated Apr 13, 2026

Resource exhaustion in Mozilla Firefox before 142 and Thunderbird before 142 allows remote attackers to interrupt application service. Mozilla identifies the Graphics: WebRender component and an out-of-memory condition but has not published the triggering input or faulty operation. No privileges or user interaction are required; the 140.x branches before 140.2 are also affected, while Thunderbird disables scripting when reading email and limits exposure there to browser-like contexts.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Mozilla Firefox before 142 and Thunderbird before 142 allows remote attackers to interrupt application service. Mozilla identifies the Graphics: WebRender component and an out-of-memory condition but has not published the triggering input or faulty operation. No privileges or user interaction are required; the 140.x branches before 140.2 are also affected, while Thunderbird disables scripting when reading email and limits exposure there to browser-like contexts.

The record

CVE
CVE-2025-9182
Published
Aug 19, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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