CVE-2026-2781

CWE-190 — Integer Overflow14 documents10 sources
Severity
9.8CRITICAL
EPSS
0.1%
top 84.64%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedFeb 24
Latest updateMar 5

Description

Integer overflow in the Libraries component in NSS. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

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 Packages8 packages

▶CVEListV5mozilla/firefoxunspecified — 148
▶NVDmozilla/firefox< 140.8.0+1
▶CVEListV5mozilla/firefox_esrunspecified — 140.8
▶CVEListV5mozilla/thunderbirdunspecified — 148+1
▶NVDmozilla/thunderbird< 140.8.0+1

🔴Vulnerability Details

3
CVEList
Integer overflow in the Libraries component in NSS↗2026-02-24
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GHSA
GHSA-q6rm-rhj9-jpg5: Integer overflow in the Libraries component in NSS↗2026-02-24
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OSV
CVE-2026-2781: Integer overflow in the Libraries component in NSS↗2026-02-24
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📋Vendor Advisories

8
Ubuntu
NSS vulnerability↗2026-03-05
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Ubuntu
NSS vulnerability↗2026-03-04
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Red Hat
firefox: thunderbird: Integer overflow in the Libraries component in NSS↗2026-02-24
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Debian
CVE-2026-2781: firefox - Integer overflow in the Libraries component in NSS. This vulnerability affects F...↗2026
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Mozilla
Mozilla Foundation Security Advisory 2026-13: CVE-2026-2781↗
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🕵️Threat Intelligence

1
Wiz
CVE-2026-2781 Impact, Exploitability, and Mitigation Steps | Wiz↗
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💬Community

1
Bugzilla
CVE-2026-2781 firefox: thunderbird: Integer overflow in the Libraries component in NSS↗2026-02-24
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CVE-2026-2781 (CRITICAL CVSS 9.8) | Integer overflow in the Libraries c | cvebase.io