Buffer overflow in Mozilla Firefox and Firefox for Android - CVE-2026-6784
Published: April 21, 2026
Vulnerability identifier: #VU126689
CSH Severity: Medium
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-6784
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to memory corruption in multiple components when processing web content. A remote attacker can trigger memory corruption to execute arbitrary code.
Some of these bugs showed evidence of memory corruption.
Affected software
Mozilla Firefox
Firefox for Android
Mozilla Thunderbird
Firefox for Android
Mozilla Thunderbird
How to mitigate CVE-2026-6784
Install security update from vendor's website.
Mozilla Firefox - update to 150.0
Firefox for Android - update to 150.0
Mozilla Thunderbird - update to 150.0
Firefox for Android - update to 150.0
Mozilla Thunderbird - update to 150.0
External References
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-30/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1536243
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1745382
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1851073
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1893400
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1963301
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2001319
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2002899
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2012436
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2014435
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2016901
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2019916
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2020486
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2020612
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2020817
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021788
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022051
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022367
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2022431
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023302
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2023670
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024225
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024238
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024240
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024265
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024367
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024369
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024424
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2024760
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025281
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025361
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025387
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025466
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025954
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2025958
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2026278
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2026292
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2026297
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2026378
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027148
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027287
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027341
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027384
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027427
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027694
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2027993
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028009
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028270
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028416
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2028524
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029295
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029301
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029461
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029699
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029800
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2029801