Uninitialized memory in the Audio/Video component. (CVE-2026-100783)
CVE-2026-100783 is a vulnerability involving uninitialized memory in the Audio/Video component of Firefox. This issue was addressed and fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. The vulnerability has a CVSS score of 4.3, indicating a medium severity level, and it impacts availability but not confidentiality or integrity. No known exploits are reported in the wild.
AI Analysis
Technical Summary
This vulnerability involves uninitialized memory usage in the Audio/Video component of Firefox. Uninitialized memory can lead to unpredictable behavior, including potential application crashes or denial of service. The issue was fixed in multiple Firefox ESR and standard releases, specifically Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. The CVSS vector indicates the attack requires network access, no privileges, and user interaction, with low complexity and impacts only availability.
Potential Impact
The vulnerability impacts availability by potentially causing application instability or crashes due to uninitialized memory usage. There is no impact on confidentiality or integrity. No active exploitation has been reported.
Mitigation Recommendations
A fix is available and has been released by Mozilla. Users and administrators should update to Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, Firefox ESR 140.17, or later versions to remediate this vulnerability. No additional mitigation actions are required beyond applying the official patches.
Uninitialized memory in the Audio/Video component. (CVE-2026-100783)
Description
CVE-2026-100783 is a vulnerability involving uninitialized memory in the Audio/Video component of Firefox. This issue was addressed and fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. The vulnerability has a CVSS score of 4.3, indicating a medium severity level, and it impacts availability but not confidentiality or integrity. No known exploits are reported in the wild.
CVSS v3.1
Score 4.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves uninitialized memory usage in the Audio/Video component of Firefox. Uninitialized memory can lead to unpredictable behavior, including potential application crashes or denial of service. The issue was fixed in multiple Firefox ESR and standard releases, specifically Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. The CVSS vector indicates the attack requires network access, no privileges, and user interaction, with low complexity and impacts only availability.
Potential Impact
The vulnerability impacts availability by potentially causing application instability or crashes due to uninitialized memory usage. There is no impact on confidentiality or integrity. No active exploitation has been reported.
Mitigation Recommendations
A fix is available and has been released by Mozilla. Users and administrators should update to Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, Firefox ESR 140.17, or later versions to remediate this vulnerability. No additional mitigation actions are required beyond applying the official patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-qw4j-2qxm-8h8h
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-100783"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abc27c9680226ef6846f843
Added to database: 09/29/2026, 21:04:09 UTC
Last enriched: 09/29/2026, 21:20:34 UTC
Last updated: 09/30/2026, 03:38:51 UTC
Views: 8
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.