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Fencer Intel
high 7.8

CVE-2026-6776 json

Incorrect boundary conditions in the WebRTC: Networking component

published 6mo ago modified 17d ago also EUVD-2026-24117

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

Incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Patch / fix

  • mozilla firefox 140.10, 150
  • mozilla firefox_esr 140.10, 150
  • mozilla thunderbird 140.10, 150
  • mozilla thunderbird_esr 140.10, 150
  • firefox-esr Debian 12 140.10.0esr-1~deb12u1
  • firefox-esr Debian 13 140.10.0esr-1~deb13u1
  • firefox-esr Debian 14 140.10.0esr-1
  • thunderbird Debian 12 1:140.10.0esr-1~deb12u1
  • thunderbird Debian 13 1:140.10.0esr-1~deb13u1
  • thunderbird Debian 14 1:140.10.0esr-1

debian advisories DEBIAN-CVE-2026-6776

  • thunderbird RHEL 9 140.10.1-1.el9_8
  • firefox RHEL 9 140.10.0-1.el9_8
  • firefox-x11 RHEL 9 140.10.0-1.el9_8
  • thunderbird RHEL 10.2 140.10.0-1.el10_2
  • firefox RHEL 10.2 140.10.0-1.el10_2
  • thunderbird RHEL 9 140.10.0-1.el9_7
  • thunderbird RHEL 8 140.10.0-1.el8_10
  • thunderbird RHEL 10.1 140.10.0-1.el10_1

red hat advisories RHSA-2026:19704RHSA-2026:19655RHSA-2026:19542RHSA-2026:19469RHSA-2026:19467RHSA-2026:19468

  • firefox-esr openSUSE Tumbleweed 153.0-1.1
  • MozillaFirefox openSUSE Tumbleweed 150.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 140.9.1-1.1

opensuse advisories openSUSE-SU-2026:11373-1openSUSE-SU-2026:10626-1openSUSE-SU-2026:10610-1

  • thunderbird AlmaLinux 9 140.10.1-1.el9_8.alma.1
  • thunderbird AlmaLinux 9 140.10.0-1.el9_7.alma.1
  • thunderbird AlmaLinux 8 140.10.0-1.el8_10.alma.1
  • thunderbird AlmaLinux 10 140.10.0-1.el10_1.alma.1
  • firefox AlmaLinux 9 140.10.0-1.el9_7.alma.1
  • firefox-x11 AlmaLinux 9 140.10.0-1.el9_7.alma.1
  • firefox AlmaLinux 8 140.10.0-1.el8_10.alma.1
  • firefox AlmaLinux 10 140.10.0-1.el10_1

almalinux advisories ALSA-2026:19348ALSA-2026:15892ALSA-2026:13537ALSA-2026:12285ALSA-2026:10757ALSA-2026:10766

  • thunderbird Rocky Linux 9 140.10.1-1.el9_8
  • firefox Rocky Linux 9 140.10.0-1.el9_7
  • thunderbird Rocky Linux 9 140.10.0-1.el9_7
  • thunderbird Rocky Linux 10 140.10.0-1.el10_1
  • thunderbird Rocky Linux 8 140.10.0-1.el8_10
  • firefox Rocky Linux 8 140.10.0-1.el8_10
  • firefox Rocky Linux 10 140.10.0-1.el10_1

rocky linux advisories RLSA-2026:19348RLSA-2026:19201RLSA-2026:15892RLSA-2026:12285RLSA-2026:13537RLSA-2026:10766

Is CVE-2026-6776 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-6776 updated cvss 3.4

firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Networking component

  • Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 10 rhel10/firefox-flatpak, rhel10/thunderbird-flatpak
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 140.10.0-1.el8_10, thunderbird 140.10.0-1.el8_10
    fixed: vendor fix RHSA-2026:10766
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 140.10.0-1.el9_7, firefox 140.10.0-1.el9_8, firefox-x11 140.10.0-1.el9_7, firefox-x11 140.10.0-1.el9_8, thunderbird 140.10.0-1.el9_7, thunderbird 140.10.1-1.el9_8
    fixed: vendor fix RHSA-2026:10757
  • Red Hat Enterprise Linux AppStream (v. 10) firefox 140.10.0-1.el10_1, firefox 140.10.0-1.el10_2, thunderbird 140.10.0-1.el10_1, thunderbird 140.10.0-1.el10_2
    fixed: vendor fix RHSA-2026:10767
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 140.10.0-1.el8_4, thunderbird 140.10.0-1.el8_4
    fixed: vendor fix RHSA-2026:19655
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 140.10.0-1.el8_6, thunderbird 140.10.0-1.el8_6 Red Hat Enterprise Linux AppStream E4S (v.8.6) firefox 140.10.0-1.el8_6, thunderbird 140.10.0-1.el8_6
    fixed: vendor fix RHSA-2026:19542
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox 140.10.0-1.el8_8, thunderbird 140.10.0-1.el8_8
    fixed: vendor fix RHSA-2026:17477
show 9 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) firefox 140.10.0-1.el9_0, thunderbird 140.10.0-1.el9_0
    fixed: vendor fix RHSA-2026:17687
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox 140.10.0-1.el9_2, firefox-x11 140.10.0-1.el9_2, thunderbird 140.10.0-1.el9_2
    fixed: vendor fix RHSA-2026:17689
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox 140.10.0-1.el10_0, thunderbird 140.10.0-1.el10_0
    fixed: vendor fix RHSA-2026:17690
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) firefox 140.10.0-1.el9_4, firefox-x11 140.10.0-1.el9_4, thunderbird 140.10.0-1.el9_4
    fixed: vendor fix RHSA-2026:19464
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox 140.10.0-1.el9_6, firefox-x11 140.10.0-1.el9_6, thunderbird 140.10.0-1.el9_6
    fixed: vendor fix RHSA-2026:17688
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox 140.10.0-1.el8_4, thunderbird 140.10.0-1.el8_4
    fixed: vendor fix RHSA-2026:19655
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) firefox 140.10.0-1.el8_6, thunderbird 140.10.0-1.el8_6
    fixed: vendor fix RHSA-2026:19542
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox 140.10.0-1.el8_8, thunderbird 140.10.0-1.el8_8
    fixed: vendor fix RHSA-2026:17477
  • Red Hat Enterprise Linux Server (v. 7 ELS) firefox 140.10.0-2.el7_9
    fixed: vendor fix RHSA-2026:19704

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
6mo ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Firefox
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.