Buffer overflow in Mozilla products - CVE-2026-0879

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the Graphics component. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

How to mitigate CVE-2026-0879

Sources

• https://www.mozilla.org/en-US/security/advisories/mfsa2026-02/
• https://www.mozilla.org/en-US/security/advisories/mfsa2026-01/
• https://www.mozilla.org/en-US/security/advisories/mfsa2026-03/