CVE-2026-113401: Vulnerability in Mozilla Firefox
Description
Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.
CVSS v3.1
Score 6.5medium
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-113401 is a denial-of-service vulnerability affecting the PDF Viewer component in Mozilla Firefox. The vulnerability allows an attacker to cause a denial-of-service condition, impacting the availability of the affected software. Mozilla fixed this vulnerability in Firefox version 158.0.1.
Potential Impact
Successful exploitation of this vulnerability could cause the Firefox PDF Viewer to become unresponsive or crash, resulting in denial of service to the user. There is no indication of code execution or data compromise from the provided information.
Mitigation Recommendations
Users should update Mozilla Firefox to version 158.0.1 or later to remediate this vulnerability. Since an official fix is available, applying this update fully mitigates the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-10-20T06:00:59.236Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-111/","vendor":"Mozilla"}]
Threat ID: 6ad76a532cdf04f6562f8762
Added to database: 10/20/2026, 13:19:15 UTC
Last enriched: 10/20/2026, 13:33:26 UTC
Last updated: 10/20/2026, 22:33:05 UTC
Views: 12
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.