CVE-2026-6753
published 2026-04-21CVE-2026-6753: Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
PriorityP341high7.3CVSS 3.1
AVNACLPRNUINSUCLILAL
EPSS
0.31%
22.6th percentile
Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 150 | Firefox 150 |
| mozilla | firefox | < 140.10.0 | 140.10.0 |
| mozilla | firefox | < 150.0 | 150.0 |
| mozilla | firefox | — | — |
| mozilla | firefox_esr | < Firefox ESR 140.10 | Firefox ESR 140.10 |
| mozilla | thunderbird | < Thunderbird 150 | Thunderbird 150 |
| mozilla | thunderbird | < Thunderbird 140.10 | Thunderbird 140.10 |
| mozilla | thunderbird | >= 140.0 < 140.10.0 | 140.10.0 |
| rhel10 | firefox-flatpak | — | — |
CVSS provenance
nvdv3.17.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
vendor_redhat7.5HIGH
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Red Hat
firefox: Incorrect boundary conditions in the WebRTC component
vendor_redhat·2026-04-21·CVSS 7.5
CVE-2026-6753 [HIGH] CWE-787 firefox: Incorrect boundary conditions in the WebRTC component
firefox: Incorrect boundary conditions in the WebRTC component
Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Incorrect boundary conditions in the WebRTC component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: firefox (Red Hat Enterprise Linux 7) - Affected
Package: firefox (Red Hat E
Mozilla
Mozilla Foundation Security Advisory 2026-32: CVE-2026-6753
vendor_mozilla
CVE-2026-6753 Mozilla Foundation Security Advisory 2026-32: CVE-2026-6753
Mozilla Foundation Security Advisory 2026-32
CVE: CVE-2026-6753
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.10
Mozilla
Mozilla Foundation Security Advisory 2026-33: CVE-2026-6753
vendor_mozilla
CVE-2026-6753 Mozilla Foundation Security Advisory 2026-33: CVE-2026-6753
Mozilla Foundation Security Advisory 2026-33
CVE: CVE-2026-6753
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 150
Mozilla
Mozilla Foundation Security Advisory 2026-34: CVE-2026-6753
vendor_mozilla
CVE-2026-6753 Mozilla Foundation Security Advisory 2026-34: CVE-2026-6753
Mozilla Foundation Security Advisory 2026-34
CVE: CVE-2026-6753
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.10
Mozilla
Mozilla Foundation Security Advisory 2026-30: CVE-2026-6753
vendor_mozilla
CVE-2026-6753 Mozilla Foundation Security Advisory 2026-30: CVE-2026-6753
Mozilla Foundation Security Advisory 2026-30
CVE: CVE-2026-6753
Product: Firefox
Impact: high
Fixed in: Firefox 150
GHSA
GHSA-q45f-ggxw-3qq8: Incorrect boundary conditions in the WebRTC component
ghsa_unreviewed·2026-04-21
CVE-2026-6753 [HIGH] CWE-119 GHSA-q45f-ggxw-3qq8: Incorrect boundary conditions in the WebRTC component
Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2027501https://www.mozilla.org/security/advisories/mfsa2026-30/https://www.mozilla.org/security/advisories/mfsa2026-32/https://www.mozilla.org/security/advisories/mfsa2026-33/https://www.mozilla.org/security/advisories/mfsa2026-34/https://access.redhat.com/errata/RHSA-2026:10757https://access.redhat.com/errata/RHSA-2026:10766https://access.redhat.com/errata/RHSA-2026:10767https://access.redhat.com/errata/RHSA-2026:12285https://access.redhat.com/errata/RHSA-2026:13537https://access.redhat.com/errata/RHSA-2026:15892https://access.redhat.com/errata/RHSA-2026:17477https://access.redhat.com/errata/RHSA-2026:17687https://access.redhat.com/errata/RHSA-2026:17688https://access.redhat.com/errata/RHSA-2026:17689https://access.redhat.com/errata/RHSA-2026:17690https://access.redhat.com/errata/RHSA-2026:19041https://access.redhat.com/errata/RHSA-2026:19131https://access.redhat.com/errata/RHSA-2026:19201https://access.redhat.com/errata/RHSA-2026:19348https://access.redhat.com/errata/RHSA-2026:19461https://access.redhat.com/errata/RHSA-2026:19462https://access.redhat.com/errata/RHSA-2026:19463https://access.redhat.com/errata/RHSA-2026:19464https://access.redhat.com/errata/RHSA-2026:19465https://access.redhat.com/errata/RHSA-2026:19466https://access.redhat.com/errata/RHSA-2026:19467https://access.redhat.com/errata/RHSA-2026:19468https://access.redhat.com/errata/RHSA-2026:19469https://access.redhat.com/errata/RHSA-2026:19542https://access.redhat.com/errata/RHSA-2026:19655https://access.redhat.com/errata/RHSA-2026:19704https://access.redhat.com/security/cve/CVE-2026-6753https://bugzilla.redhat.com/show_bug.cgi?id=2460092https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6753.json
2026-04-21
Published