Question 1

What is CVE-2026-118021 — CVE-2026-118021?

Accepted Answer

Sandbox escape due to use-after-free in the XPCOM component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.

Question 2

What is the authoritative source for CVE-2026-118021?

Accepted Answer

CVE-2026-118021 (CVE-2026-118021) is catalogued in NVD + CISA KEV + FIRST EPSS and curated for EU compliance use cases by SQUR.

CVE-2026-118021CVE-2026-118021

Description