Description
Denial-of-service in the Networking component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
Published: 2026-09-29
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial-of-Service
Action: Patch Immediately
AI Analysis

Impact

A flaw in the Networking component of Mozilla Firefox and Mozilla Thunderbird can cause the applications to crash, resulting in a denial‑of‑service for the affected user. The vulnerability lets an attacker craft network traffic that triggers the crash, though the specific trigger is not detailed in the advisory. The impact is limited to loss of availability for the affected application instances and does not involve remote code execution or data compromise.

Affected Systems

Mozilla Firefox versions older than 157 and Mozilla Thunderbird versions older than 157 are affected. Users running any release before 157 should upgrade to a patched version to receive the fix.

Risk and Exploitability

The CVSS score of 6.5 denotes medium severity. The EPSS score is very low, indicating a low probability of exploitation. The vulnerability is not listed in the KEV catalog. Based on the description, the likely attack vector involves malicious network traffic that exploits the flaw in the Networking component of both Firefox and Thunderbird. The impact is limited to loss of availability for the user session and does not enable code execution or data theft.

Generated by OpenCVE AI on September 30, 2026 at 21:36 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade to Firefox 157 or later and Thunderbird 157 or later to receive the vendor’s fix.
  • If an upgrade is not feasible, restrict network access to the Firefox or Thunderbird processes through firewall rules or network segmentation to limit exposure to potential malicious traffic.
  • Continuously monitor application logs and system resources for abnormal crash patterns or elevated CPU/memory usage that may indicate exploitation attempts.

Generated by OpenCVE AI on September 30, 2026 at 21:36 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Mon, 19 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla thunderbird
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Vendors & Products Mozilla thunderbird

Wed, 30 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Description Denial-of-service in the Networking component. This vulnerability was fixed in Firefox 157. Denial-of-service in the Networking component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
References

Tue, 29 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox

Tue, 29 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 29 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
Description Denial-of-service in the Networking component. This vulnerability was fixed in Firefox 157.
Title Denial-of-service in the Networking component
References

Subscriptions

Mozilla Firefox Thunderbird
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-09-30T17:14:54.895Z

Reserved: 2026-09-26T19:17:30.645Z

Link: CVE-2026-100795

cve-icon Vulnrichment

Updated: 2026-09-29T14:35:03.582Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-29T13:17:44.550

Modified: 2026-10-19T15:24:45.317

Link: CVE-2026-100795

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-30T21:45:12Z

Weaknesses
  • CWE-770

    Allocation of Resources Without Limits or Throttling