PT-2026-33962 · Mozilla+1 · Firefox+2

Nan Wang · Published 2026-04-21 · Updated 2026-05-19 · CVE-2026-6776

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 150 Firefox ESR versions prior to 140.10 Thunderbird versions prior to 150 Thunderbird versions prior to 140.10

Description Incorrect boundary conditions exist in the WebRTC: Networking component.

Recommendations Update to version 150 Update to version 140.10 Update to version 150 Update to version 140.10

Fix

DoS

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

ALSA-2026:10757

ALSA-2026:10766

ALSA-2026:10767

ALSA-2026:12285

ALSA-2026:13537

ALSA-2026:15892

ALSA-2026:19348

BDU:2026-06950

CVE-2026-6776

OESA-2026-2105

OESA-2026-2106

OESA-2026-2107

OESA-2026-2108

OESA-2026-2109

OPENSUSE-SU-2026:10610-1

OPENSUSE-SU-2026:10626-1

RHSA-2026:10757

RHSA-2026:10766

RHSA-2026:10767

RHSA-2026:19348

Affected Products

Firefox

Rocky Linux

Thunderbird

References · 193

• https://mozilla.org/en-US/security/advisories/mfsa2026-32 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06950 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6766 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6754 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6759 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-33 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10626-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-6776 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-6776 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6765 · Security Note
• https://errata.rockylinux.org/RLSA-2026:10757 · Vendor Advisory
• https://errata.almalinux.org/9/ALSA-2026-10757.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6749 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-5732 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-30 · Vendor Advisory