Sandbox escape due to use-after-free in the XPCOM component
CVSS score
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EPSS probability
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Risk score
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Published
3 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%63
Short explanation
A sandbox escape vulnerability due to a use-after-free flaw in the XPCOM component has been reported in Mozilla Firefox [S0]. The vulnerability was addressed in Firefox 159 [S0].
Sandbox escape vulnerabilities are critical as they can allow attackers to bypass security boundaries and gain elevated capabilities within the environment [S0].
What should be done?
- Upgrade Firefox to the recommended vendor versions [S0]
- Review the vendor security advisories for updates [S0]
Chain of evidence and sources
CVE-2026-118021, XPCOM bileşenindeki use-after-free hatasından kaynaklanan bir koruma alanı dışına çıkma açığıdır.
İlgili zafiyet Firefox 159 sürümünde giderilmiştir.
Show the technical text from the sources
Sandbox escape due to use-after-free in the XPCOM component. This vulnerability was fixed in Firefox 159.
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-118021 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | mozilla | firefox | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-118021 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-118021 weaknesses.
Official Sources and Advisories
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