Integer Overflow in NSS Libraries Affecting Firefox by Mozilla
CVE-2026-2781

8.8HIGH

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2781?

An integer overflow vulnerability exists in the Libraries component of NSS, impacting specific versions of Mozilla Firefox and Firefox ESR. This issue could allow an attacker to exploit the overflow, potentially leading to unexpected behaviors, crashes, or execution of arbitrary code. It is crucial for users to update to the latest versions to mitigate risks associated with this vulnerability.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

Firefox < 148

Firefox ESR < 140.8

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2009552
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-15/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Clay Ver Valen
JSON
.