Memory corruption through undisclosed internal defects
Published Sep 1, 2026 · Updated Sep 3, 2026
Memory-safety defects in Mozilla Firefox and Thunderbird 154 allow attackers to cause unspecified impacts via unspecified vectors. Mozilla reports evidence of memory corruption or other security-relevant defects, but the accessible advisories do not disclose the affected loci or unsafe operations. Thunderbird disables scripting while reading mail, so Mozilla states that these defects generally are not exploitable through email and instead present risk in browser or browser-like contexts.
Summary
What happened
Memory-safety defects in Mozilla Firefox and Thunderbird 154 allow attackers to cause unspecified impacts via unspecified vectors. Mozilla reports evidence of memory corruption or other security-relevant defects, but the accessible advisories do not disclose the affected loci or unsafe operations. Thunderbird disables scripting while reading mail, so Mozilla states that these defects generally are not exploitable through email and instead present risk in browser or browser-like contexts.
The record
- CVE
- CVE-2026-84142
- Published
- Sep 1, 2026
- Updated
- Sep 3, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
No CVSS assessment is available in this record.
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.
Weakness, pattern, technique
No sourced classifications are available.
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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