CVE-2026-2807 — Out-of-bounds Write in Mozilla Firefox

CWE-787 — Out-of-bounds Write9 documents8 sources
Severity
9.8CRITICALNVD
EPSS
0.1%
top 80.98%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedFeb 24

Description

Memory safety bugs present in Firefox 147 and Thunderbird 147. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 148 and Thunderbird 148.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages2 packages

▶NVDmozilla/firefox< 148.0
▶NVDmozilla/thunderbird< 148.0

🔴Vulnerability Details

3
OSV
CVE-2026-2807: Memory safety bugs present in Firefox 147 and Thunderbird 147↗2026-02-24
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GHSA
GHSA-xx53-6qqj-gr7w: Memory safety bugs present in Firefox 147 and Thunderbird 147↗2026-02-24
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CVEList
Memory safety bugs fixed in Firefox 148 and Thunderbird 148↗2026-02-24
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📋Vendor Advisories

4
Red Hat
firefox: thunderbird: Memory safety bugs fixed in Firefox 148 and Thunderbird 148↗2026-02-24
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Debian
CVE-2026-2807: firefox - Memory safety bugs present in Firefox 147 and Thunderbird 147. Some of these bug...↗2026
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Mozilla
Mozilla Foundation Security Advisory 2026-16: CVE-2026-2807↗
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Mozilla
Mozilla Foundation Security Advisory 2026-13: CVE-2026-2807↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-2807 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-2807 — Out-of-bounds Write in Mozilla Firefox | cvebase