CVE-2026-2801 — Improper Check for Unusual or Exceptional Conditions in Mozilla Firefox

CWE-754 — Improper Check for Unusual or Exceptional Conditions9 documents8 sources
Severity
7.5HIGHNVD
EPSS
0.1%
top 82.20%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Mozilla FirefoxMozilla Thunderbird
Timeline
PublishedFeb 24

Description

Incorrect boundary conditions in the JavaScript: WebAssembly component. 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:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages2 packages

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

🔴Vulnerability Details

3
CVEList
Incorrect boundary conditions in the JavaScript: WebAssembly component↗2026-02-24
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OSV
CVE-2026-2801: Incorrect boundary conditions in the JavaScript: WebAssembly component↗2026-02-24
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GHSA
GHSA-3wfp-66x3-wgq2: Incorrect boundary conditions in the JavaScript: WebAssembly component↗2026-02-24
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📋Vendor Advisories

4
Red Hat
firefox: thunderbird: Incorrect boundary conditions in the JavaScript: WebAssembly component↗2026-02-24
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Debian
CVE-2026-2801: firefox - Incorrect boundary conditions in the JavaScript: WebAssembly component. This vul...↗2026
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Mozilla
Mozilla Foundation Security Advisory 2026-13: CVE-2026-2801↗
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Mozilla
Mozilla Foundation Security Advisory 2026-16: CVE-2026-2801↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-2801 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-2801 — Mozilla Firefox vulnerability | cvebase