PT-2026-33934 · Mozilla+1 · Firefox+2

Inseo An · Published 2026-04-21 · Updated 2026-05-19 · CVE-2026-6748

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/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 Uninitialized memory exists in the Audio/Video: Web Codecs component.

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

Fix

DoS

Weakness Enumeration

CWE-457

Related Identifiers

ALSA-2026:10757

ALSA-2026:10766

ALSA-2026:10767

ALSA-2026:12285

ALSA-2026:13537

ALSA-2026:15892

ALSA-2026:19348

CVE-2026-6748

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 · 192

• https://mozilla.org/en-US/security/advisories/mfsa2026-32 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-32/#CVE-2026-6748 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-6748 · Vendor Advisory
• 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://mozilla.org/security/advisories/mfsa2026-32/#CVE-2026-6748 · Vendor Advisory
• 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