CVE-2026-84143
EUVD-2026-6909101.09.2026, 13:20
Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.Enginsight
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| mozilla | firefox | 𝑥 < 140.15.0 |
| mozilla | firefox | 141.0.0 ≤ 𝑥 < 153.2.0 |
| mozilla | thunderbird | 𝑥 < 140.15.0 |
| mozilla | thunderbird | 141.0 ≤ 𝑥 < 153.2.0 |
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| mozilla | firefox | 154.0.0 ≤ 𝑥 < 155.0.0 | CNA |
| mozilla | firefox_esr | 116.0.0 ≤ 𝑥 < 140.15.0 | CNA |
| mozilla | firefox_esr | 141.0.0 ≤ 𝑥 < 153.2.0 | CNA |
| mozilla | thunderbird | 154.0 ≤ 𝑥 < 155.0 | CNA |
| mozilla | thunderbird_esr | 𝑥 < 140.15.0 | CNA |
| mozilla | thunderbird_esr | 141.0 ≤ 𝑥 < 153.2.0 | CNA |
Debian Releases
Debian Product | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| firefox |
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| firefox-esr |
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| thunderbird |
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Ubuntu Releases
Ubuntu Product | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| firefox |
| ||||||||||
| thunderbird |
| ||||||||||
| mozjs38 |
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| mozjs52 |
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| mozjs68 |
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| mozjs78 |
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| mozjs91 |
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| mozjs102 |
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| mozjs115 |
|
openSUSE / SLES Releases
openSUSE Product | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MozillaFirefox |
| ||||||||||||||||||||||
| MozillaFirefox-branding-SLE-153 |
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| MozillaFirefox-devel |
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| MozillaFirefox-translations-common |
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| MozillaFirefox-translations-other |
|
Red Hat Enterprise Linux Releases
Amazon Linux Releases
Common Weakness Enumeration
- CWE-119 - Improper Restriction of Operations within the Bounds of a Memory BufferThe software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.
- CWE-200 - Exposure of Sensitive Information to an Unauthorized ActorThe product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
References