Vulnerability · Published Mar 24, 2026 · Assigned by mozilla
CVE-2026-4704Denial-of-service in the WebRTC: Signaling component
High 7.5
In plain English
A high-severity uncontrolled resource consumption in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 51% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 48.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Denial-of-service in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | firefox | 140.9.0-1.el10_1 | ALSA-2026:5931 |
| AlmaLinux:8 | firefox | 140.9.0-1.el8_10.alma.1 | ALSA-2026:5932 |
| AlmaLinux:9 | firefox | 140.9.0-1.el9_7.alma.1 | ALSA-2026:5930 |
| AlmaLinux:9 | firefox-x11 | 140.9.0-1.el9_7.alma.1 | ALSA-2026:5930 |
| AlmaLinux:10 | thunderbird | 140.9.0-1.el10_1.alma.1 | ALSA-2026:6342 |
| AlmaLinux:8 | thunderbird | 140.9.0-1.el8_10.alma.1 | ALSA-2026:6917 |
| AlmaLinux:9 | thunderbird | 140.9.0-1.el9_7.alma.1 | ALSA-2026:6188 |
| Debian:12 | firefox-esr | 140.9.0esr-1~deb12u1 | DSA-6178-1 |
| Debian:12 | firefox-esr | 140.9.0esr-1~deb12u1 | DEBIAN-CVE-2026-4704 |
| Debian:13 | firefox-esr | 140.9.0esr-1~deb13u1 | DEBIAN-CVE-2026-4704 |
| Debian:13 | firefox-esr | 140.9.0esr-1~deb13u1 | DSA-6178-1 |
| Debian:14 | firefox-esr | 140.9.0esr-1 | DEBIAN-CVE-2026-4704 |
| Debian:12 | thunderbird | 1:140.9.0esr-1~deb12u1 | DSA-6179-1 |
| Debian:12 | thunderbird | 1:140.9.0esr-1~deb12u1 | DEBIAN-CVE-2026-4704 |
| Debian:13 | thunderbird | 1:140.9.0esr-1~deb13u1 | DEBIAN-CVE-2026-4704 |
| Debian:13 | thunderbird | 1:140.9.0esr-1~deb13u1 | DSA-6179-1 |
| Debian:14 | thunderbird | 1:140.9.0esr-1 | DEBIAN-CVE-2026-4704 |
| Rocky Linux:10 | firefox | 0:140.9.0-1.el10_1 | RLSA-2026:5931 |
| Rocky Linux:8 | firefox | 0:140.9.0-1.el8_10 | RLSA-2026:5932 |
| Rocky Linux:9 | firefox | 0:140.9.0-1.el9_7 | RLSA-2026:5930 |
| Rocky Linux:10 | thunderbird | 0:140.9.0-1.el10_1 | RLSA-2026:6342 |
| Rocky Linux:8 | thunderbird | 0:140.9.0-1.el8_10 | RLSA-2026:6917 |
| Rocky Linux:9 | thunderbird | 0:140.9.0-1.el9_7 | RLSA-2026:6188 |
| Ubuntu:22.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2026-4704 |
| Ubuntu:24.04:LTS | mozjs102 | no fix listed | UBUNTU-CVE-2026-4704 |
| Ubuntu:24.04:LTS | mozjs115 | no fix listed | UBUNTU-CVE-2026-4704 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2026-4704 |
| Ubuntu:22.04:LTS | mozjs91 | no fix listed | UBUNTU-CVE-2026-4704 |
| Ubuntu:22.04:LTS | thunderbird | no fix listed | UBUNTU-CVE-2026-4704 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | see references |
| Mozilla | Thunderbird | see references |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H