CVE-2026-2774
Published: February 24, 2026· Updated: Feb 26, 2026
Official Description
Integer overflow in the Audio/Video component. This vulnerability affects Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.
Risk Analysis
This critical vulnerability in Firefox and Thunderbird involves an integer overflow in the Audio/Video component. With a CVSS score of 9.8, it presents a significant risk, potentially leading to arbitrary code execution or denial of service. Despite the high severity, the EPSS score of 0.00046 suggests a very low likelihood of exploitation.
No public exploit is currently known for this vulnerability. However, its network attack vector and low attack complexity indicate it is remotely exploitable.
To mitigate this vulnerability, users should update Firefox to version 148 or later, Firefox ESR to 115.33 or 140.8 or later, and Thunderbird to version 148 or 140.8 or later. Regularly applying security updates is crucial for browser and email client security.
Technical Analysis
CVE-2026-2774 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
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (6)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-2774 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts