CRITICAL
CVE-2026-2762
Published: February 24, 2026· Updated: Feb 28, 2026
9.8
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:13.8th
Official Description
Integer overflow in the JavaScript: Standard Library component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
Technical Analysis
CVE-2026-2762 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Vendors & Products
Mozilla2 products
firefoxthunderbird
Source: NVD CPE · 2 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (5)
→
https://bugzilla.mozilla.org/show_bug.cgi?id=2011649Issue Tracking · Permissions Required
→
https://www.mozilla.org/security/advisories/mfsa2026-13/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2026-15/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2026-16/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2026-17/Vendor Advisory
Quick Facts
CVE IDCVE-2026-2762
CVSS Score9.8 / 10
SeverityCRITICAL
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedFeb 24, 2026
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-2762 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.